有两个变量a，b，不使用任何中间变量交换它们

//--------------------------------

// 环境：VS2005

// 用途：不用中间变量交换两个数

// 时间：2010.9.25

// 作者：http://pppboy.blog.163.com

//--------------------------------

#include "stdafx.h"

#include <iostream>

using namespace std;

//交换a，b

void fSwap1(int& a, int& b)

{

a = a ^ b;

b = a ^ b;

a = a ^ b;

}

//交换a，b的另一种方法

void fSwap2(int& a, int& b)

{

a = a + b;

b = a - b;

a = a - b;

}

//再一种方法

void fSwap3(int& a, int& b)

{

a = a * b;

b = a / b;

a = a / b;

}

int main(int argc, char* argv[])

{

int a, b;

cout << "------------------------------" << endl;

cout << "input a :" << endl;

cin >> a;

cout << "input b :" << endl;

cin >> b;

cout << "------------------------------" << endl;

cout << "a = " << a << endl;

cout << "b = " << b << endl;

cout << "------------------------------" << endl;

fSwap1(a, b);

cout << "after swap (1):" << endl;

cout << "a = " << a << endl;

cout << "b = " << b << endl;

fSwap2(a, b);

cout << "after swap (2):" << endl;

cout << "a = " << a << endl;

cout << "b = " << b << endl;

fSwap3(a, b);

cout << "after swap (3):" << endl;

cout << "a = " << a << endl;

cout << "b = " << b << endl;

system("pause");

return 0;

}

------------------------------

input a :

32

input b :

65

------------------------------

a = 32

b = 65

------------------------------

after swap (1):

a = 65

b = 32

after swap (2):

a = 32

b = 65

after swap (3):

a = 65

b = 32

请按任意键继续. . .