交换两个整形变量的值（不能创建临时变量）

#include<stdio.h>
int main()
{
int num1 = 56;
int num2 = 78;
printf("交换前：\n");
printf("num1=%d\tnum2=%d\n", num1, num2);
num1 = num1^num2;
num2 = num1^num2;
num1 = num1^num2;
printf("交换后：\n");
printf("num1=%d\tnum2=%d\n", num1, num2);
system("pause");


}