Contents
iv
2.8 Chapter Summary ...................................................................................................45
2.9 Exercises .................................................................................................................46
Chapter 3 Computing with Numbers 51
3.1 Numeric Data Types ............................................................................................... 51
3.2 Using the Math Library ...........................................................................................55
3.3 Accumulating Results: Factorial ............................................................................... 58
3.4 The Limits of Int ..................................................................................................... 61
3.5 Handling Large Numbers: Long Ints ....................................................................... 64
3.6 Type Conversions ....................................................................................................66
3.7 Chapter Summary ...................................................................................................68
3.8 Exercises ............................................................................................................... 69
Chapter 4 Computing with Strings 77
4.1 The String Data Type ........................................................................................... 77
4.2 Simple String Processing ...................................................................................... 82
4.3 Strings, Lists, and Sequences ................................................................................ 85
4.4 Strings and Secret Codes ...................................................................................... 87
4.4.1 String Representation .............................................................................. 87
4.4.2 Programming an Encoder ......................................................................... 89
4.4.3 Programming a Decoder ........................................................................... 90
4.4.4 Other String Operations ........................................................................... 94
4.4.5 From Encoding to Encryption ................................................................... 95
4.5 Input/Output as String Manipulation .................................................................... 97
4.5.1 Example Application: Date Conversion ..................................................... 97
4.5.2 String Formatting .................................................................................. 102
4.5.3 Better Change Counter .......................................................................... 104
4.6 File Processing ..................................................................................................... 106
4.6.1 Multi-Line Strings .................................................................................... 106
4.6.2 File Processing ...................................................................................... 107
4.6.3 Example Program: Batch Usernames ....................................................... 111
4.6.4 Coming Attraction: Objects ................................................................... 112
4.7 Chapter Summary ................................................................................................. 113
4.8 Exercises .............................................................................................................. 115
Chapter 5 Objects and Graphics 123
5.1 Overview ............................................................................................................ 123
5.2 The Object of Objects .......................................................................................... 124
5.3 Simple Graphics Programming .............................................................................. 125
5.4 Using Graphical Objects ..................................................................................... 129
5.5 Graphing Future Value ......................................................................................... 135
5.6 Choosing Coordinates ........................................................................................... 143
5.7 Interactive Graphics .............................................................................................. 146
5.7.1 Getting Mouse Clicks ............................................................................... 146
5.7.2 Handling Textual Input ............................................................................ 148
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