C語言類函式巨集和一般函式的區別
阿新 • • 發佈：2019-01-28
類函式巨集：function-like-macro 用#define使用引數來定義巨集，巨集的引數用圓括號括起來，可以使一個引數或者多個引數，然後在使用的過程中這些引數將會被替換。
例如：
#define SQUARE(X) X*X //定義類函式巨集
z = SQUARE(3); //使用類函式巨集編譯&執行：[[email protected] test]# cat test.c #include <stdio.h> #define SQUARE(X) X*X int squ_fun(int); int main(void) { int x = 0; printf("Please input one integer(n), and square(n+1) will be shown via two \ ways(function-like macro and general function). The default is 0.\n"); scanf("%d", &x); printf("Evaluating SQUARE(3) is: %d \n", SQUARE(x+1)); printf("Evaluating squ_fun(3) is: %d \n", squ_fun(x+1)); return 0; } int squ_fun(int i) { int z = 0; z = i * i; return z; }
[[email protected] test]# gcc test.c
[[email protected] test]# ./a.out
Please input one integer(n), and square(n+1) will be shown via two ways(function-like macro and general function). The default is 0.
3
Evaluating SQUARE(3) is: 7
Evaluating squ_fun(3) is: 16