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C++ 实例 - 交换两个数

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