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Exercise 1-5 What is wrong with this excerpt
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Exercise 1-6 List all the different outputs this could produce with various orders of evaluation:
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Try it on as many compilers as you can, to see what happens in practice
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Consistency leads to better programs If formatting varies unpredictably, or a loop over an array runs uphill this time and downhill the next, or strings are copied with strcpy here and a f o r loop there, the variations make it harder to see what's really going on But if the same computation is done the same way every time it appears, any variation suggests a genuine difference, one worth noting
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Use a consistent indentation and brace style Indentation shows structure, but which indentation style is best Should the opening brace go on the same line as the i f or on the next Programmers have always argued about the layout of programs, but the specific style is much less important than its consistent application Pick one style, preferably ours, use it consistently, and don't waste time arguing Should you include braces even when they are not needed Like parentheses, braces can resolve ambiguity and occasionally make the code clearer For consistency, many experienced programmers always put braces around loop or i f bodies But if the body is a single statement they are unnecessary, so we tend to omit them If you also choose to leave them out, make sure you don't drop them when they are needed to resolve the "dangling else" ambiguity exemplified by this excerpt:
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i f (month==FEB) { i f (year%4 == 0) i f (day > 29) l e g a l = FALSE; e l se i f (day > 28) l e g a l = FALSE;
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The indentation is misleading, since the e l s e is actually attached to the line
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and the code is wrong When one i f immediately follows another, always use braces:
i f (month==FEB) i f (year%4 == 0) { i f (day > 29) 1 egal = FALSE; 1 else { i f (day > 28)
Syntax-driven editing tools make this sort of mistake less likely Even with the bug fixed, though, the code is hard to follow The computation is easier to grasp if we use a variable to hold the number of days in February:
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The code is still wrong-2000 is a leap year, while 1900 and 2100 are not- this but structure is much easier to adapt to make it absolutely right By the way, if you work on a program you didn't write, preserve the style you find there When you make a change, don't use your own style even though you prefer it The program's consistency is more important than your own, because it makes life easier for those who follow
Use idioms for consistency Like natural languages, programming languages have idioms, conventional ways that experienced programmers write common pieces of code A central part of learning any language is developing a familiarity with its idioms
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One of the most common idioms is the form of a loop Consider the C, C++, or Java code for stepping through the n elements of an array, for example to initialize them Someone might write the loop like this:
i=O; while (i <= n-1) array[i++] = 1 0 ;
or perhaps like this:
f o r (i = 0 ; i < n; ) array[i++] = 1 0 ;
or even:
f o r (i = n; --i >= 0 ; ) arrayCi1 = 1 0 ;
All of these are correct, but the idiomatic form is like this: f o r (i = 0 ; i < n; i++) array[i] = 10; This is not an arbitrary choice It visits each member of an n-element array indexed from 0 to n-1 It places all the loop control in the f o r itself, runs in increasing order, and uses the very idiomatic ++ operator to update the loop variable It leaves the index variable at a known value just beyond the last array element Native speakers recognize it without study and write it correctly without a moment's thought In C++ or Java, a common variant includes the declaration of the loop variable: f o r ( i n t i = 0 ; i < n; i++) array[i] = 10; Here is the standard loop for walking along a list in C: f o r (p = l i s t ; p != NULL; p
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