C++ 实例 - 交换两个数

以下我们使用两种方法来交换两个变量：使用临时变量与不使用临时变量。

实例 - 使用临时变量

#include <iostream>
using namespace std;

int main()
{
    int a = 5, b = 10, temp;

    cout << "交换之前：" << endl;
    cout << "a = " << a << ", b = " << b << endl;

    temp = a;
    a = b;
    b = temp;

    cout << "\n交换之后：" << endl;
    cout << "a = " << a << ", b = " << b << endl;

    return 0;
}

以上程序执行输出结果为：

交换之前：
a = 5, b = 10

交换之后：
a = 10, b = 5

实例 - 不使用临时变量

#include <iostream>
#include <iostream>
using namespace std;

int main()
{

    int a = 5, b = 10;

    cout << "交换之前：" << endl;
    cout << "a = " << a << ", b = " << b << endl;

    a = a + b;
    b = a - b;
    a = a - b;

    cout << "\n交换之后：" << endl;
    cout << "a = " << a << ", b = " << b << endl;

    return 0;
}

以上程序执行输出结果为：

交换之前：
a = 5, b = 10

交换之后：
a = 10, b = 5