c++交换两个数的值

1、使用临时变量

#include <iostream>
using namespace std;
int main()
{
    int a = 2, b = 7, temp;
    cout << "交换前：" << endl;
    cout << "a = " << a << ", b = " << b << endl;
    temp = a;
    a = b;
    b = temp;
    cout << "交换后：" << endl;
    cout << "a = " << a << ", b = " << b << endl;
    return 0;
}

2、不使用临时变量

#include <iostream>
using namespace std;
int main()
{
    
    int a = 2, b = 7;
    cout << "交换前：" << endl;
    cout << "a = " << a << ", b = " << b << endl;
    a = a + b;
    b = a - b;
    a = a - b;
    cout << "交换后：" << endl;
    cout << "a = " << a << ", b = " << b << endl;
    return 0;
}