c11_08.cpp

it can help you know C++ souce program quckily

//***********************************
//**         C11_08.cpp            **
//**       引用参数传递            **
//***********************************

# 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;
}