编辑代码

#include <iostream>
using namespace std;

//如果不需要返回值，声明的时候可以写 void
void han (int num1, int num2)
{
    cout << "交换前：" << endl;
    cout << "num1 = " << num1 << endl;
    cout << "num2 = ：" << num2 << endl;

    int fen = num1;
    num1 = num2;
    num2 = fen;

    cout << "交换后：" << endl;
    cout << "num1 = " << num1 << endl;
    cout << "num2 = ：" << num2 << endl;    
    
    //return;   返回值不需要的时候，可以不写return
}

int main()
{
    int a = 40;
    int b = 80;

    han(a,b);


    system("pause");

    return 0;
}