#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;
}

交换之前：
a = 5, b = 10

交换之后：
a = 10, b = 5

#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;
}

交换之前：
a = 5, b = 10

交换之后：
a = 10, b = 5