Andrew Koenig's C Traps and Pitfalls PDF

By Andrew Koenig

ISBN-10: 0201179288

ISBN-13: 9780201179286

Such a lot traps and methods are renowned, yet it is often strong programming perform to rememeber them.
So analyzing this booklet (also for knowledgeable programmers) is advised to top take into account the foundation of improvement of well-working software program.

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Sample text

Work on some implementations but not others are mentioned ih Chapter 7, which look!! at portability pro~lems. 1 Po~nters and. arrays The C notions of pointers and arrays are inseparably joined, to the extent that it is impossible to understand one thoroughly without also under~ standing the other. Moreover, C treats some. spects of these notions diff~rently from any other well-known language. Two ~hings st~n4 out about. ~ arrays: 1. C has only one-dimensional arrays, and the size of an array must be fixed as "a constant at compilation time.

Note the use of asymmetric bounds in this loop. 9 49 = i 0; while (i tabsize < & tab[i] 1= x) i++; Then the loop would probably still appear to work, but would do so only because of two lucky breaks. The first is that both comparisons in this example are of a kind that yield 0 if the condition is false and 1 if the condition is true. As long as x and yare both 1 or 0, x&y and x&&y will always have the same value. However, if one of the comparisons were to be replaced by one that uses some nonzero value other than 1 to represent "true," then.

Moreover, 12 is not even evaluated in the latter expression, nor is f () in 10: If ( ). Consider the following program fragment to look for a particular element in a table: = i 0; while (i < tabsize i++; && tab[i] 1= x) The idea behind this loop is that if i is equal to tabsize when the loop terminates, then the element sought was not found. Otherwise, i contains the element's index. Note the use of asymmetric bounds in this loop. 9 49 = i 0; while (i tabsize < & tab[i] 1= x) i++; Then the loop would probably still appear to work, but would do so only because of two lucky breaks.

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C Traps and Pitfalls by Andrew Koenig


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