【转】不申请额外空间，交换A、B

http://www.cnblogs.com/liulunet/archive/2011/05/17/2049407.html

 

//不申请额外内存空间就可以完成数据互换的算法:int x=a,y=b;设计一个算法，不申请第三个变量，试把a b互换位置

#include <iostream>

using std::cin;

using std::cout;

using std::endl;

int main()

{

    int x,y;

    cout << "Enter two numbers: X Y" << endl;

    cin >> x >> y;

    cout << "X = " << x << endl << "Y = " << y << endl;

    x = x+y;

    y = x-y;

    x = x-y;

    cout << "Through the exchange:" << endl << "X = " << x << endl << "Y = " << y << endl;

    return 0;

}