不允许创建临时变量，交换两个数的内容

无中间变量交换两个数的值

#include<stdio.h>;int main(){int a,b;printf("请输入数字a=");scanf("%d",&a);printf("请输入数字b=");scanf("%d",&b);printf("交换a,b得:");a=a+b;b=a-b;//b=aa=a-b;//a=bprintf("a=%d   b=%d\n",a,b);return 0;}