>[info] 宏定义函数使用 ~~~C #include <stdio.h> #define exchange(x,y) { int t;t=x;x=y;y=t; } //注意放在一行 int main() { int x=1,y=2; printf("x=%d，y=%d\n", x, y); exchange(x,y); printf("x=%d，y=%d\n", x, y); return 0; } ~~~