Download e-book for iPad: C Traps and Pitfalls by Andrew Koenig

By Andrew Koenig

So much traps and methods are popular, yet it is often reliable programming perform to rememeber them.
So examining this booklet (also for knowledgeable programmers) is advised to most sensible consider the foundation of improvement of well-working software program.

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Similarly, 10 I 12 is 14 (1110 binary) and ~10 is -11 (11 ... 110101 binary), at least on a 2's complement machine. " These operators return 1 for "true" and 0 for "false," they never return anything but 1 or 0, and the && and I I operators do not even evaluate their right-hand operands if their results can be determined from their left-hand operands. Thus I 10 is 0 because 10 is nonzero, 10&&12 is 1 because both 10 and 12 are nonzero, and 10: I 12 is also 1 because 10 is nonzero. Moreover, 12 is not even evaluated in the latter expression, nor is f () in 10: If ( ).

Such a program might contain a switch statement to handle each of the various operation codes. On such a machine, it is often true that a subtract operation is identical to an add operation after the sign of the second operand has been inverted. Thus, it is nice to be able to write something like this: 24 SYNTACTIC PITFALLS CHAPTER 2 case SUBTRACT: opnd2 -opnd2; 1* no break *1 case ADD: Of course, a com~ent such as the one in the example ~bove is a good idea; it lets the reader know that the lack of a break statement is intentional.

Here is another counting example: given a program that generates integers in some sequence, print those integers in columns. More precisely, the output should consist of some number of pages, each of which contains NeOLS columns of NROWSelements each. Consecutive values are obtained by reading down the columns, not across the rows. We will make several simplifying assumptions to concentrate on the counting aspects of the problem. First, we assume that our program will be expressed as a pair of functions called print and flush.

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