26.函数的值传递

#include<iostream>

using namespace std;

//值传递，形参改变不影响实参

void swap(int num1, int num2)

{

    int a = num1;

    num1 = num2;

    num2 = a;

}

int main()

{

    int a = 1, b = 2;

    swap(a, b);

    cout << a << endl;

    cout << b << endl;

    system("pause");

    return 0;

}