//交换两个变量的值，不使用第三个变量。//有两种解法, 一种用算术算法, 一种用^(异或) //异或：相同为0，不同为1。相当于减法。#include <stdio.h>int main(){int a = 8;int b = 9;printf("初始状态：a = %d, b = %d\n",a,b);a = a + b;b = a – b;a = a – b; printf("算数交换：a = %d, b = %d\n",a,b);a = a ^ b;b = a ^ b; a = a ^ b;printf("异或交换：a = %d, b = %d\n",a,b);return 0;}
，还要高声歌唱。那歌声，一定是响遏流云的，
