C++ 实例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