交换两个值，不使用中间变量

#include
int main(void){
        int a=3,b=4;

 

        a=a+b;   

        b=a-b;   

        a=a-b;   

        printf("a=%d,b=%d",a,b);

 

        return 0;
}

 

#include
int main(void){
        int a=3,b=4;

 

        a=a^b;
        b=a^b;
        a=a^b;
        printf("a=%d,b=%d",a,b);

 

        return 0;
}