c11_07.cpp

it can help you know C++ souce program quckily

//***********************************
//**         C11_07.cpp            **
//**      指针作为参数传递         **
//***********************************
# include <iostream >
using namespace std;

void swap(int *a, int *b)	//函数定义，a和b是形式参数
{
	int		temp;
	temp = *a;
	*a = *b;
	*b = temp;
}

int main()
{
	int		i,j;
	i = 10;
	j = 20;
	cout<<"Before swap"<<endl;
	cout<<"i = "<<i<<","<<"j = "<<j<<endl;
	swap(&i, &j);			//调用函数swap(&i,&j),&i和&j是实参
	cout<<"After swap"<<endl;
	cout<<"i = " <<i<<","<<"j = "<<j<<endl;		//i=20,j=10;
	
	return 0;
}