a,b交换

如题：

a = a^b;

b = b^a;

a = a^b;

#include <stdio.h>#define SWAP(a,b)\                {\                 (a) = (a)^(b);(b) = (b)^(a);(a) = (a)^(b);\                }int main(void){        int a = 100,b = 200;        SWAP(a,b);        printf("a = %d,b = %d\n",a,b);        return 0;}