用异或来实现两个变量值对调

#include <iostream>
using namespace std;

void swap(int *x, int *y);

int main()
{
	int a, b;
	cout << "请输入两个不同的值：" << endl;
	cin >> a >> b;

	swap(&a, &b);
	
	cout << "现在a = " << a << ", b = " << b << endl;
	return 0;
}

void swap(int *x, int *y)
{
	*x ^= *y;
	*y ^= *x;
	*x ^= *y;
}

当然，也可以写成

*x = *x ^ *y;
*y = *y ^ *x;
*x = *x ^ *y;