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。
#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
#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