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Does the code use long names (unless it s necessary to use short ones)
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11. The Power of Variable Names
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Does the code avoid abbreviations that save only one character Are all words abbreviated consistently Are the names pronounceable Are names that could be mispronounced avoided Are short names documented in translation tables
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Common Naming Problems: Have You Avoided...
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...names that are misleading ...names with similar meanings ...names that are different by only one or two characters ...names that sound similar ...names that use numerals ...names intentionally misspelled to make them shorter ...names that are commonly misspelled in English ...names that conflict with standard library-routine names or with predefined variable names ...totally arbitrary names ...hard-to-read characters
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Good variable names are a key element of program readability. Specific kinds of variables such as loop indexes and status variables require specific considerations. Names should be as specific as possible. Names that are vague enough or general enough to be used for more than one purpose are usually bad names. Naming conventions distinguish among local, class, and global data. They distinguish among type names, named constants, enumerated types, and variables. Regardless of the kind of project you re working on, you should adopt a variable naming convention. The kind of convention you adopt depends on the size of your program and the number of people working on it. Abbreviations are rarely needed with modern programming languages. If you do use abbreviations, keep track of abbreviations in a project dictionary or use the Standardized Prefixes approach.
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12. Fundamental Data Types
Page 1
Fundamental Data Types
Contents 12.1 Numbers in General
12.2 Integers 12.3 Floating-Point Numbers 12.4 Characters and Strings 12.5 Boolean Variables 12.6 Enumerated Types 12.7 Named Constants 12.8 Arrays 12.9 Creating Your Own Types
3 CC2E.COM/ 1278
Related Topics Naming data: 11
Unusual data types: 13 General issues in using variables: 10 Formatting data declarations: Laying Out Data Declarations in Section 31.5 Documenting variables: Commenting Data Declarations in Section 32.5 Creating classes: 6 THE FUNDAMENTAL DATA TYPES ARE the basic building blocks for all other data types. This chapter contains tips for using integers, floating-point numbers, characters and strings, boolean variables, enumerated types, named constants, and arrays. The final section in this chapter describes how to create your own types. This chapter covers basic troubleshooting for the fundamental types of data. If you ve got your fundamental-data bases covered, skip to the end of the chapter, review the checklist of problems to avoid, and move on to the discussion of unusual data types in 13.
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12. Fundamental Data Types
Page 2
12.1 Numbers in General
Here are several guidelines for making your use of numbers less error prone.
1 CROSS-REFERENCE
2 more details on using named
constants instead of magic numbers, see Section 12.7, 4 Named Constants, later in 5 this chapter.
Avoid magic numbers. Magic numbers are literal numbers such as 100 or 47524 that appear in the middle of a program without explanation. If you program in a language that supports named constants, use them instead. If you can t use named constants, use global variables when it is feasible to.
Avoiding magic numbers yields three advantages: Changes can be made more reliably. If you use named constants, you won t overlook one of the 100s, or change a 100 that refers to something else. Changes can be made more easily. When the maximum number of entries changes from 100 to 200, if you re using magic numbers you have to find all the 100s and change them to 200s. If you use 100+1 or 100-1 you ll also have to find all the 101s and 99s and change them to 201s and 199s. If you re using a named constant, you simply change the definition of the constant from 100 to 200 in one place. Your code is more readable. Sure, in the expression
for i = 0 to 99 do ...
you can guess that 99 refers to the maximum number of entries. But the expression
for i = 0 to MAX_ENTRIES-1 do ...
leaves no doubt. Even if you re certain that a number will never change, you get a readability benefit if you use a named constant.
Use hard-coded 0s and 1s if you need to The values 0 and 1 are used to increment, decrement, and start loops at the first element of an array. The 0 in
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