An educational institution wishes to maintain a database of its employees. The database is divided into number of classes whose hierarchical relationships are shown in below figure. The figure also shows minimum information required for each class. Specify all the classes and define functions to create the database and retrieve individual information as and when required

 



#include<iostream>
using namespace std;
class staff
{
    protected:
            int code;
            string name;
    public:
            void setdata()
            {
                cout<<"enter the code : "<<endl;
                cin>>code;
                cout<<"enetr the name : "<<endl;
                cin>>name;
            }
};

class teacher : public staff
{
    private:
            string sub;
            string publication;
    public:
            void getdata();
            void showdata();
};

void teacher :: getdata()
{
    setdata();
    cout<<"enter the sub of teacher : "<<endl;
    cin>>sub;
    cout<<"enter the publication : "<<endl;
    cin>>publication;
}

void teacher :: showdata()
{
    cout<<"code            : "<<code<<endl;
    cout<<"name of teacher : "<<name<<endl;
    cout<<"sub of teacher  : "<<sub<<endl;
    cout<<"publication of teacher  : "<<publication<<endl;
}

class officer : public staff
{
    private:
            char grade;
    public:
            void getdata();
            void showdata();
};

void officer :: getdata()
{
    setdata();
    cout<<"enter the grade of officer : A, B, C, D :"<<endl;
    cin>>grade;
}

void officer :: showdata()
{
    cout<<"code             : "<<code<<endl;
    cout<<"name of officer  : "<<name<<endl;
    cout<<"grade of officer : "<<grade<<endl;
}

class typist : public staff
{
    protected:
            int speed;
    public:
            void getdata();
            void showdata();
};

void typist :: showdata()
{
    cout<<"code            : "<<code<<endl;
    cout<<"name of typist  : "<<name<<endl;
    cout<<"speed of typist : "<<speed<<" wps "<<endl;
}

void typist :: getdata()
{
    setdata();
    cout<<"enter the speed of typing in wps "<<endl;
    cin>>speed;
}

class regualar : public typist
{
    public:
    private:
        //    void display();
};


class casual : public typist
{
    private:
            int daily_wages;
    public:
            void set();
            void display();
};

void casual :: set()
{
    getdata();
    cout<<"enter the daily wages of casual typer : "<<endl;
    cin>>daily_wages;
}

void casual :: display ()
{
    showdata();
    cout<<"daily wages of casual typer : "<<daily_wages<<" Rs."<<endl;
}

int main()
{
    staff member;
    int i;
    cout<<"choose any staff member : \n1. Teacher\n2. Officer\n3. Typist "<<endl;
    cin>>i;
    if(i==1)
    {
        teacher mem;
        // mem.setdata();
        mem.getdata();
        mem.showdata();
    }

    if(i==2)
    {
        officer mem;
        // mem.setdata();
        mem.getdata();
        mem.showdata();
    }

    else if(i==3)
    {
        typist mem;
        int t;
        cout<<"choose typer type : \n1. Regular\n2. casual "<<endl;
        cin>>t;
        if(t==1)
        {
            regualar m;
            m.getdata();
            m.showdata();
        }

        else if(t==2)
        {
            casual m;
            m.set();
            m.display();
        }
    }
}

output :

choose any staff member : 1. Teacher 2. Officer 3. Typist 3 choose typer type : 1. Regular 2. casual 2 enter the code : 324 enetr the name : Rahul enter the speed of typing in wps 32 enter the daily wages of casual typer : 343 code : 324 name of typist : Rahul speed of typist : 32 wps daily wages of casual typer : 343 Rs.

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