#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;
}