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Text
EDITIONINTERMEZZO 1
Matthias Felleisen, Robert Bruce Findler, Matthew Flatt, Shriram Krishnamurthi; MIT Press, 2002, ISBN 0262062186. Teaches software design via Scheme language. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group.III ABSTRACTION
Consider the two functions in figure 86, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail.HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as TYPOS - HOW TO DESIGN PROGRAMS The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
INTERMEZZO 1: BEGINNING STUDENT LANGUAGE Intermezzo 1: Beginning Student Language. Fixed-Size Data deals with BSL as if it were a natural language. It introduces the “basic words” of the language, suggests how to compose “words” into “sentences,” and appeals to your knowledge of algebra for an intuitive understanding of these “sentences.”. While this kind of HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECONDEDITIONINTERMEZZO 1
Matthias Felleisen, Robert Bruce Findler, Matthew Flatt, Shriram Krishnamurthi; MIT Press, 2002, ISBN 0262062186. Teaches software design via Scheme language. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group.III ABSTRACTION
Consider the two functions in figure 86, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail.HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as TYPOS - HOW TO DESIGN PROGRAMS The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
INTERMEZZO 1: BEGINNING STUDENT LANGUAGE Intermezzo 1: Beginning Student Language. Fixed-Size Data deals with BSL as if it were a natural language. It introduces the “basic words” of the language, suggests how to compose “words” into “sentences,” and appeals to your knowledge of algebra for an intuitive understanding of these “sentences.”. While this kind of HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.orgVI ACCUMULATORS
Designing a program that performs this calculation is a mere exercise in structural function design. Figure 177 contains the complete program. When the given list is not ' (), the natural recursion computes the absolute distance of the remainder of the dots to the first one on (rest l).Because the first is not the actual origin and has a distance of (first l) to the origin, we must add (first HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.eduIV INTERTWINED DATA
In all examples, the coefficient of x is 5, that of y is 17, and the one for z is 3. If we are given values for variables, we can determine the value of a polynomial. For example, if x = 1 0, the value of is 5 0; if x = 1 0 and y = 1, the value of is 6 7; and if x = 1 0, y = 1, and z = 2, the value of is 7 3.EPILOGUE: MOVING ON
Epilogue: Moving On. Computing. Program Design. Onward, Developers and Computer Scientists. Onward, Accountants, Journalists, Surgeons, and Everyone Else. You have reached the end of this introduction to computing and programming, or program design, as we say here. While there is more to learn about both subjects, this is a good point tostop
III ABSTRACTION
Consider the two functions in figure 90, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to INTERMEZZO 2: QUOTE, UNQUOTE Roughly speaking, a list constructed with the list function can be constructed even more concisely by quoting lists. Conversely, a quoted list abbreviates a construction with list. Technically, quote is a keyword for a compound sentence in the spirit of Intermezzo 1: Beginning Student Language and it is used like this: ( quote (1 2 3)).
HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING AND How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts.2 ON MICE AND KEYS
2 On Mice and Keys. Figure 199 displays another program that handles mouse events. Specifically, it is an interactive program that just records where the mouse events occur via small dots. It is acceptable to break the rule of separating data representations and image rendering for such experimental programs, whose sole purpose it is to determine how something works. INTERMEZZO 1: BEGINNING STUDENT LANGUAGE Intermezzo 1: Beginning Student Language. Fixed-Size Data deals with BSL as if it were a natural language. It introduces the “basic words” of the language, suggests how to compose “words” into “sentences,” and appeals to your knowledge of algebra for an HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECONDEDITIONINTERMEZZO 1
Matthias Felleisen, Robert Bruce Findler, Matthew Flatt, Shriram Krishnamurthi; MIT Press, 2002, ISBN 0262062186. Teaches software design via Scheme language. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group.III ABSTRACTION
Consider the two functions in figure 86, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail.HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as TYPOS - HOW TO DESIGN PROGRAMS The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
INTERMEZZO 1: BEGINNING STUDENT LANGUAGE Intermezzo 1: Beginning Student Language. Fixed-Size Data deals with BSL as if it were a natural language. It introduces the “basic words” of the language, suggests how to compose “words” into “sentences,” and appeals to your knowledge of algebra for an intuitive understanding of these “sentences.”. While this kind of HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECONDEDITIONINTERMEZZO 1
Matthias Felleisen, Robert Bruce Findler, Matthew Flatt, Shriram Krishnamurthi; MIT Press, 2002, ISBN 0262062186. Teaches software design via Scheme language. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group.III ABSTRACTION
Consider the two functions in figure 86, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail.HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as TYPOS - HOW TO DESIGN PROGRAMS The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
INTERMEZZO 1: BEGINNING STUDENT LANGUAGE Intermezzo 1: Beginning Student Language. Fixed-Size Data deals with BSL as if it were a natural language. It introduces the “basic words” of the language, suggests how to compose “words” into “sentences,” and appeals to your knowledge of algebra for an intuitive understanding of these “sentences.”. While this kind of HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.orgVI ACCUMULATORS
Designing a program that performs this calculation is a mere exercise in structural function design. Figure 177 contains the complete program. When the given list is not ' (), the natural recursion computes the absolute distance of the remainder of the dots to the first one on (rest l).Because the first is not the actual origin and has a distance of (first l) to the origin, we must add (first HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.eduIV INTERTWINED DATA
In all examples, the coefficient of x is 5, that of y is 17, and the one for z is 3. If we are given values for variables, we can determine the value of a polynomial. For example, if x = 1 0, the value of is 5 0; if x = 1 0 and y = 1, the value of is 6 7; and if x = 1 0, y = 1, and z = 2, the value of is 7 3.EPILOGUE: MOVING ON
Epilogue: Moving On. Computing. Program Design. Onward, Developers and Computer Scientists. Onward, Accountants, Journalists, Surgeons, and Everyone Else. You have reached the end of this introduction to computing and programming, or program design, as we say here. While there is more to learn about both subjects, this is a good point tostop
III ABSTRACTION
Consider the two functions in figure 90, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to INTERMEZZO 2: QUOTE, UNQUOTE Roughly speaking, a list constructed with the list function can be constructed even more concisely by quoting lists. Conversely, a quoted list abbreviates a construction with list. Technically, quote is a keyword for a compound sentence in the spirit of Intermezzo 1: Beginning Student Language and it is used like this: ( quote (1 2 3)).
HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING AND How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts.2 ON MICE AND KEYS
2 On Mice and Keys. Figure 199 displays another program that handles mouse events. Specifically, it is an interactive program that just records where the mouse events occur via small dots. It is acceptable to break the rule of separating data representations and image rendering for such experimental programs, whose sole purpose it is to determine how something works. INTERMEZZO 1: BEGINNING STUDENT LANGUAGE Intermezzo 1: Beginning Student Language. Fixed-Size Data deals with BSL as if it were a natural language. It introduces the “basic words” of the language, suggests how to compose “words” into “sentences,” and appeals to your knowledge of algebra for an HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECONDEDITIONINTERMEZZO 1
Matthias Felleisen, Robert Bruce Findler, Matthew Flatt, Shriram Krishnamurthi; MIT Press, 2002, ISBN 0262062186. Teaches software design via Scheme language. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
III ABSTRACTION
Consider the two functions in figure 86, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group.VI ACCUMULATORS
Designing a program that performs this calculation is a mere exercise in structural function design. Figure 177 contains the complete program. When the given list is not ' (), the natural recursion computes the absolute distance of the remainder of the dots to the first one on (rest l).Because the first is not the actual origin and has a distance of (first l) to the origin, we must add (first HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail.HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as TYPOS - HOW TO DESIGN PROGRAMS The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECONDEDITIONINTERMEZZO 1
Matthias Felleisen, Robert Bruce Findler, Matthew Flatt, Shriram Krishnamurthi; MIT Press, 2002, ISBN 0262062186. Teaches software design via Scheme language. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
III ABSTRACTION
Consider the two functions in figure 86, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group.VI ACCUMULATORS
Designing a program that performs this calculation is a mere exercise in structural function design. Figure 177 contains the complete program. When the given list is not ' (), the natural recursion computes the absolute distance of the remainder of the dots to the first one on (rest l).Because the first is not the actual origin and has a distance of (first l) to the origin, we must add (first HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail.HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as TYPOS - HOW TO DESIGN PROGRAMS The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.orgVI ACCUMULATORS
Designing a program that performs this calculation is a mere exercise in structural function design. Figure 177 contains the complete program. When the given list is not ' (), the natural recursion computes the absolute distance of the remainder of the dots to the first one on (rest l).Because the first is not the actual origin and has a distance of (first l) to the origin, we must add (firstIV INTERTWINED DATA
In all examples, the coefficient of x is 5, that of y is 17, and the one for z is 3. If we are given values for variables, we can determine the value of a polynomial. For example, if x = 1 0, the value of is 5 0; if x = 1 0 and y = 1, the value of is 6 7; and if x = 1 0, y = 1, and z = 2, the value of is 7 3. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.eduEPILOGUE: MOVING ON
Epilogue: Moving On. Computing. Program Design. Onward, Developers and Computer Scientists. Onward, Accountants, Journalists, Surgeons, and Everyone Else. You have reached the end of this introduction to computing and programming, or program design, as we say here. While there is more to learn about both subjects, this is a good point tostop
III ABSTRACTION
Consider the two functions in figure 90, which consume lists of strings and look for specific strings.The function on the left looks for "dog", the one on the right for "cat".The two functions are nearly indistinguishable. Each consumes lists of strings; each function body consists of a cond expression with two clauses. Each produces #false if the input is ' (); each uses an or expression to INTERMEZZO 2: QUOTE, UNQUOTE Roughly speaking, a list constructed with the list function can be constructed even more concisely by quoting lists. Conversely, a quoted list abbreviates a construction with list. Technically, quote is a keyword for a compound sentence in the spirit of Intermezzo 1: Beginning Student Language and it is used like this: ( quote (1 2 3)).
HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING AND How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts.2 ON MICE AND KEYS
2 On Mice and Keys. Figure 199 displays another program that handles mouse events. Specifically, it is an interactive program that just records where the mouse events occur via small dots. It is acceptable to break the rule of separating data representations and image rendering for such experimental programs, whose sole purpose it is to determine how something works. INTERMEZZO 1: BEGINNING STUDENT LANGUAGE Intermezzo 1: Beginning Student Language. Fixed-Size Data deals with BSL as if it were a natural language. It introduces the “basic words” of the language, suggests how to compose “words” into “sentences,” and appeals to your knowledge of algebra for an HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECOND EDITIONSEPTEMBER 2003 VERSION How to Design Programs. How to Design Programs. The First Edition isstill available!
HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail. V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.edu PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING ANDEPUB HOW TO READEPUB HOW TO USEFREE PROGRAM TO MAKE DOCUMENTSFREE EASY TO USE DESIGN PROGRAMSHOW TO CONVERT EPUB TO PDF How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts. TYPOS - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS 2EHOW TO DESIGN PROGRAMS PDFHOW TO DESIGN PROGRAMS RACKETHOW TO DESIGN SOFTWAREHOW TO DESIGN PROGRAMS 2ND EDITION PDF The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECOND EDITIONSEPTEMBER 2003 VERSION How to Design Programs. How to Design Programs. The First Edition isstill available!
HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail. V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.edu PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING ANDEPUB HOW TO READEPUB HOW TO USEFREE PROGRAM TO MAKE DOCUMENTSFREE EASY TO USE DESIGN PROGRAMSHOW TO CONVERT EPUB TO PDF How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts. TYPOS - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS 2EHOW TO DESIGN PROGRAMS PDFHOW TO DESIGN PROGRAMS RACKETHOW TO DESIGN SOFTWAREHOW TO DESIGN PROGRAMS 2ND EDITION PDF The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING AND How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts. HOW TO DESIGN PROGRAMS How to Design Programs. The Book. the complete text. Second Edition. a completely revised version, with writing in progress. Solutions. solutions to all exercises. Problem Sets. additional problem sets notfound in the book.
PREFACE - HOW TO DESIGN PROGRAMS Systematic Program Design. A program interacts with people, dubbed users, and other programs, in which case we speak of server and client components. Hence any reasonably complete program consists of many building blocks: some deal with input, some create output, while some bridge the gap between those two. II ARBITRARILY LARGE DATA II Arbitrarily Large Data. II. Arbitrarily Large Data. Every data definition in Fixed-Size Data describes data of a fixed size. To us, Boolean values, numbers, strings, and images are atomic; computer scientists say they have a size of one unit. With a structure, you compose a fixed number of pieces of data. Even if you use the languageof data
2 ON MICE AND KEYS
2 On Mice and Keys. Figure 199 displays another program that handles mouse events. Specifically, it is an interactive program that just records where the mouse events occur via small dots. It is acceptable to break the rule of separating data representations and image rendering for such experimental programs, whose sole purpose it is to determine how something works.I FIXED-SIZE DATA
The rest of this chapter introduces four forms of atomic data of BSL: numbers, strings, images, and Boolean values. The next volume, How to Design Components, will explain how to design atomic data. We use the word “atomic” here in analogy to physics. You cannot peek inside atomic pieces of data, but you do have functions that combine several pieces of atomic data into another oneIV INTERTWINED DATA
Once a family tree is large, it makes sense to represent it as data and to design programs that process this kind of data. Given that a point in a family tree combines five pieces of information— the father, the mother, the name, the birth date, and the eye color— we should define a structure type: (define-struct child )III ABSTRACTION
III Abstraction. Many of our data definitions and function definitions look alike. For example, the definition for a list of String s differs from that of a list of Number s in only two places: the names of the classes of data and the words “String” and “Number.” Similarly, a function that looks for a specific string in a list of String s is nearly indistinguishable from one that looksVI ACCUMULATORS
VI Accumulators. When you ask ISL+ to apply some function f to an argument a, you usually get some value v.If you evaluate (f a) again, you get v again. As a matter of fact, you get v no matter how often you request the evaluation of (f a). The function application may also loop forever or signal an error, but we ignore these possibilities. HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECOND EDITIONSEPTEMBER 2003 VERSION How to Design Programs. How to Design Programs. The First Edition isstill available!
HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail. V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.edu PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING ANDEPUB HOW TO READEPUB HOW TO USEFREE PROGRAM TO MAKE DOCUMENTSFREE EASY TO USE DESIGN PROGRAMSHOW TO CONVERT EPUB TO PDF How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts. TYPOS - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS 2EHOW TO DESIGN PROGRAMS PDFHOW TO DESIGN PROGRAMS RACKETHOW TO DESIGN SOFTWAREHOW TO DESIGN PROGRAMS 2ND EDITION PDF The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECOND EDITIONSEPTEMBER 2003 VERSION How to Design Programs. How to Design Programs. The First Edition isstill available!
HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail. V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.edu PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING ANDEPUB HOW TO READEPUB HOW TO USEFREE PROGRAM TO MAKE DOCUMENTSFREE EASY TO USE DESIGN PROGRAMSHOW TO CONVERT EPUB TO PDF How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts. TYPOS - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS 2EHOW TO DESIGN PROGRAMS PDFHOW TO DESIGN PROGRAMS RACKETHOW TO DESIGN SOFTWAREHOW TO DESIGN PROGRAMS 2ND EDITION PDF The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING AND How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts. HOW TO DESIGN PROGRAMS How to Design Programs. The Book. the complete text. Second Edition. a completely revised version, with writing in progress. Solutions. solutions to all exercises. Problem Sets. additional problem sets notfound in the book.
PREFACE - HOW TO DESIGN PROGRAMS Systematic Program Design. A program interacts with people, dubbed users, and other programs, in which case we speak of server and client components. Hence any reasonably complete program consists of many building blocks: some deal with input, some create output, while some bridge the gap between those two. II ARBITRARILY LARGE DATA II Arbitrarily Large Data. II. Arbitrarily Large Data. Every data definition in Fixed-Size Data describes data of a fixed size. To us, Boolean values, numbers, strings, and images are atomic; computer scientists say they have a size of one unit. With a structure, you compose a fixed number of pieces of data. Even if you use the languageof data
2 ON MICE AND KEYS
2 On Mice and Keys. Figure 199 displays another program that handles mouse events. Specifically, it is an interactive program that just records where the mouse events occur via small dots. It is acceptable to break the rule of separating data representations and image rendering for such experimental programs, whose sole purpose it is to determine how something works.I FIXED-SIZE DATA
The rest of this chapter introduces four forms of atomic data of BSL: numbers, strings, images, and Boolean values. The next volume, How to Design Components, will explain how to design atomic data. We use the word “atomic” here in analogy to physics. You cannot peek inside atomic pieces of data, but you do have functions that combine several pieces of atomic data into another oneIV INTERTWINED DATA
Once a family tree is large, it makes sense to represent it as data and to design programs that process this kind of data. Given that a point in a family tree combines five pieces of information— the father, the mother, the name, the birth date, and the eye color— we should define a structure type: (define-struct child )III ABSTRACTION
III Abstraction. Many of our data definitions and function definitions look alike. For example, the definition for a list of String s differs from that of a list of Number s in only two places: the names of the classes of data and the words “String” and “Number.” Similarly, a function that looks for a specific string in a list of String s is nearly indistinguishable from one that looksVI ACCUMULATORS
VI Accumulators. When you ask ISL+ to apply some function f to an argument a, you usually get some value v.If you evaluate (f a) again, you get v again. As a matter of fact, you get v no matter how often you request the evaluation of (f a). The function application may also loop forever or signal an error, but we ignore these possibilities. HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECOND EDITIONSEPTEMBER 2003 VERSION How to Design Programs. How to Design Programs. The First Edition isstill available!
HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. How to Design Programs. The Book. the complete text. What Changed. differences from the first edition. DrRacket. programming environment. Mail. V GENERATIVE RECURSION V Generative Recursion. V. Generative Recursion. If you follow the design recipe of the first four parts, either you turn domain knowledge into code or you exploit the structure of the data definition to organize your code. Some functions merely compose such functions; we group those with the “structural” group. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.edu PROLOGUE: HOW TO PROGRAM Now it is time to switch roles. Start DrRacket. Doing so brings up the window of figure 3. Select “Choose language” from the “Language” menu, which opens a dialog listing “Teaching Languages” for “How to Design Programs.”. Choose “Beginning Student” (the Beginning Student Language, or BSL) and click OK toset up DrRacket.
HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING ANDEPUB HOW TO READEPUB HOW TO USEFREE PROGRAM TO MAKE DOCUMENTSFREE EASY TO USE DESIGN PROGRAMSHOW TO CONVERT EPUB TO PDF How to Design Programs: An Introduction to Computing and Programming. How to Design Programs. An Introduction to Computing and Programming. Matthias Felleisen. Robert Bruce Findler. Matthew Flatt. Shriram Krishnamurthi. The MIT Press. Cambridge, Massachusetts. TYPOS - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS 2EHOW TO DESIGN PROGRAMS PDFHOW TO DESIGN PROGRAMS RACKETHOW TO DESIGN SOFTWAREHOW TO DESIGN PROGRAMS 2ND EDITION PDF The new wording is: and produces a list of that many numbers, each randomly chosen from the range from 20 to 120. Develop the function tie-dyed. It consumes a natural number and produces a list of that many numbers, each randomly chosen in the range from 20 to 120. Use tie-dyed to apply draw-circles from exercise~9.5.8.HTDP PROBLEM SET
Solution. Problem 4: Develop a function that when given an initial amount of money (called the principal), a simple annual interest rate, and a number of months will compute the balance at the end of that time. Assume that no additional deposits or withdrawals are made and and that a month is 1/12 of a year. Total interest is the product ofthe
HTDP.ORG - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS, SECOND EDITIONSEPTEMBER 2003 VERSION How to Design Programs The First Edition is still available! HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org V GENERATIVE RECURSION Figure 152: A graphical illustration of the quick-sort algorithm To develop an understanding of how the quick-sort algorithm works, let’s walk through an example, quick-sorting (list 11 8 14 7). Figure 152 illustrates the process in a graphical way. The figure consists of a top half, the divide phase, and the bottom half, theconquer phase.
HOW TO DESIGN PROGRAMS, SECOND EDITION This is the first version of the second edition. The Book: the complete text What Changed: differences from the first edition HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to matthias @ ccs.neu.edu PROLOGUE: HOW TO PROGRAM The top half of DrRacket is called the definitions area.In this area, you create the programs, which is called editing.As soon as you add a word or change something in the definitions area, the SAVE button shows up in the top-left corner. When you click SAVE for the first time, DrRacket asks you for the name of a file so that it can store your program for good. TYPOS - HOW TO DESIGN PROGRAMSHOW TO DESIGN PROGRAMS 2EHOW TO DESIGN PROGRAMS PDFHOW TO DESIGN PROGRAMS RACKETHOW TO DESIGN SOFTWAREHOW TO DESIGN PROGRAMS 2ND EDITION PDF The following items correct errors in the first and second printing of the book. They have all been corrected in the third printing of the book and the on-line version.. page 24: The problem statement correctly specifies that "ecreasing the price by a dime ($.10) increases attendance by 15."HTDP PROBLEM SET
Problem 4: Develop the function string-append-n*, which consumes a non-empty list of strings and produces a single string resulting from appending all of the strings together.Use the built-in function string-append: String String -> String, which appends two strings.. Now develop the more general function string-append*, which consumes any list of strings and produces a single string as HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING ANDEPUB HOW TO READEPUB HOW TO USEFREE PROGRAM TO MAKE DOCUMENTSFREE EASY TO USE DESIGN PROGRAMSHOW TO CONVERT EPUB TO PDF How to Design Programs An Introduction to Computing and Programming Matthias Felleisen Robert Bruce Findler Matthew Flatt ShriramKrishnamurthi
HTDP PROBLEM SET
Problem 11: contributed by Professor Stephen Bloch, Adelphi University. The nation of Progressiva has a simple tax code. The tax you pay is your salary times the tax rate, and the tax rate is 1/2% per thousand dollars of salary. HOW TO DESIGN PROGRAMS, SECOND EDITION How to Design Programs, Second Edition. Please send reports about mistakes to authors @ htdp.org PREFACE - HOW TO DESIGN PROGRAMS Systematic Program Design. A program interacts with people, dubbed users, and other programs, in which case we speak of server and client components. Hence any reasonably complete program consists of many building blocks: some deal with input, some create output, while some bridge the gap between those two. HOW TO DESIGN PROGRAMS: AN INTRODUCTION TO COMPUTING AND How to Design Programs An Introduction to Computing and Programming Matthias Felleisen Robert Bruce Findler Matthew Flatt ShriramKrishnamurthi
2 ON MICE AND KEYS
2 On Mice and Keys. Figure 199 displays another program that handles mouse events. Specifically, it is an interactive program that just records where the mouse events occur via small dots. It is acceptable to break the rule of separating data representations and image rendering for such experimental programs, whose sole purpose it is to determine how something works.I FIXED-SIZE DATA
The rest of this chapter introduces four forms of atomic data of BSL: numbers, strings, images, and Boolean values. The next volume, How to Design Components, will explain how to design atomic data. We use the word “atomic” here in analogy to physics. You cannot peek inside atomic pieces of data, but you do have functions that combine several pieces of atomic data into another oneIV INTERTWINED DATA
Once a family tree is large, it makes sense to represent it as data and to design programs that process this kind of data. Given that a point in a family tree combines five pieces of information— the father, the mother, the name, the birth date, and the eye color— we should define a structure type: (define-struct child ) II ARBITRARILY LARGE DATA The first Then again, if this list is supposed to represent a record with a fixed number of pieces, use a structure type instead. item of this list is a string, the second one is a number, and the last one a Boolean. You may consider this list as the representation of a personnel record with three pieces of data: the name of the employee, the number of years spent at the company, and whetherIII ABSTRACTION
III Abstraction. Many of our data definitions and function definitions look alike. For example, the definition for a list of String s differs from that of a list of Number s in only two places: the names of the classes of data and the words “String” and “Number.” Similarly, a function that looks for a specific string in a list of String s is nearly indistinguishable from one that looks HOW TO DESIGN PROGRAMS This is the first update since the third printing by the MIT Press. This release corrects mistakes and typographical errors in the firstthree printings.
VI ACCUMULATORS
VI Accumulators. When you ask ISL+ to apply some function f to an argument a, you usually get some value v.If you evaluate (f a) again, you get v again. As a matter of fact, you get v no matter how often you request the evaluation of (f a). The function application may also loop forever or signal an error, but we ignore these possibilities. How to Design Programs The First Edition is still available!Details
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