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C++ 实例 - 交换两个数

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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

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