不用变量交换两个数

不用变量交换两个数

分析:

位异或运算: a^b^b = a;   a^b^a = b

代码:

#include <iostream>
using namespace std;
int main(){
	int a = 3, b = 5;
	cout << a << "  " << b <<  endl;
	a = a^b;   
	b = a^b;    //相当于a^b^b = a
	a = a^b;    //相当于a^b^a = b
	cout << a << "  " << b << endl;
}

输出: