C++ 实例 – 交换两个数

C++ 实例 - 交换两个数

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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

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