#include<stdio.h> #define SWAP(VALUE1,VALUE2) do{ VALUE1 += VALUE2; VALUE2 = VALUE1 - VALUE2; VALUE1 = VALUE1 - VALUE2;}while(0) int main() { double a,b; a = 2; b = 1; printf("a = %lf,b = %lf\n",a,b); SWAP(a,b); printf("a = %lf,b = %lf\n",a,b); return 0; }
原文：http://www.cnblogs.com/waiting-for/p/4141233.html