C++中关键字Struct和Class的区别(3)

/*
** FileName     : StructAndClassDiffDemo
** Author       : Jelly Young
** Date         : 2013/12/7
** Description  : More information, please go to http://www.jb51.net
*/
 
#include <iostream>
using namespace std;
 
struct A
{
private:
    int b;
 
protected:
    int c;
 
public:
    A()
    {
        b = 10;
        c = 20;
        d = 30;
    }
 
    int d;
};
 
struct B : A
{
    void printA_C()
    {
        cout<<A::c<<endl;
    };
 
    // private member can not see
    /*void printA_B()
    {
    cout<<A::b<<endl;
    }*/
 
    void printA_D()
    {
        cout<<A::d<<endl;
    }
};
 
int main(int argc, char* argv[])
{
 
    A a1;
    B b1;
 
    // private member can not see
    //cout<<a1.b<<endl;
 
    // protected member can not see
    //cout<<a1.c<<endl;
 
    // public member can see
    cout<<a1.d<<endl;
 
    return 0;
}

class B:A{}; // private 继承
 
class A{};
struct B:A{}; // public 继承