继承与派生[练习]

#include<iostream>
#include<string>
using namespace std;
class stud
{
    public:
    stud(int xh=150209,string xm="kuangdaoyizhimei");
    ~stud()
    {
        cout<<"xigou"<<endl;
    }
    void shuchu();
    void shuru();
    private:
    int xuehao ;
    string xingming;
};
stud::stud(int xh,string xm)
{
    xuehao=xh;
    xingming=xm;
    cout<<"gouzao"<<endl;
}
void stud::shuru()
{
    cin>>xuehao>>xingming;
}
void stud::shuchu()
{
    cout<<"xuehao:"<<xuehao<<endl<<"xingming:"<<xingming<<endl;
}
class paisheng:public stud
{
    public:
    paisheng(int,int ,string);
    ~paisheng();
    void shuchu();
    void shuru();
    private:
    int nianling;
};
paisheng::paisheng(int nl,int xh,string xm):stud(xh,xm)
{
    nianling=nl;
    cout<<"paishenggouzao"<<endl;
}
paisheng::~paisheng()
{
    cout<<"paishengxigou"<<endl;
}
void paisheng::shuru()
{
    cin>>nianling;
}
void paisheng::shuchu()
{
    cout<<"nianling:"<<nianling<<endl;
    stud::shuchu();
}
class paisheng1:public paisheng
{
    public:
    void shuchu();
    paisheng1(int nl,int xh,string xm,string xb);
    ~paisheng1();
    private:
    string xingbie;
};
paisheng1::paisheng1(int nl,int xh,string xm,string xb):paisheng(nl,xh,xm)
{
    cout<<"paisheng1gouzao"<<endl;
    xingbie=xb;
}
paisheng1::~paisheng1()
{
    cout<<"paisheng1xigou"<<endl;
}
void paisheng1::shuchu()
{
    cout<<"xingbie:"<<xingbie<<endl;
    paisheng::shuchu();
}
int main()
{
    paisheng1 std(20,816249,"zhengrongjun","nan");
    std.shuchu();
    return 0;
}