c14_06.cpp

it can help you use C++ program we

#include <iostream>
using namespace std;

class A
{
	int		m_var1;
public:
	int		m_var2;
	void set(int i,int j)
	{
		m_var1 = i;
		m_var2 = j;
	}
};

void display(A a)
{
	cout <<a.m_var1<<' , ';		//error:在类外不能访问私有数据成员
	cout <<a.m_var2<<endl;		//正确:在类外可以访问公有数据成员
}

int main( )
{
	A a;
	a.set(1,2);
	display(a);

	return 0;
}