#include<iostream>
using namespace std;
void swap(int* p1, int* p2)
{
int temp;
temp = *p1;
*p1 = *p2;
*p2 = temp;
}
int main()
{
int a = 10;
int b = 20;//地址传递不会改变实参
swap(a,b);
cout << a << endl;
cout << b << endl;
system("pause");
return 0;
}