[考古]政大資科88

[wasiseal (11)]

 There exist pitfalls to avoid when using macros as

 functions in the C programming language.For example, all

 of the following three versions of macros are supposed to

 compute the square of x.Please give Three examples

 (expression) to illustrate that the macros may fail to computer correct

 results if we treat macros ad functions the first example should only

 fail in case (a), the second example should fail in case(a) and (b),

 and the third example will fail in all three cases.

 (a)#define SQUARE(x)    x * x
 (b)#define SQUARE(x)   (x)*(x)
 (c)#define SQUARE(x)   ((x)*(x))

 第二個example想不出來.......

 先謝謝大家了...題目好長

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