Inheritance in OOP (C++)

#include<iostream>
using namespace std;


class building
{

    int room, sqft;

public:

    building()
    {
        room=sqft=0;
    }

    building(int x, int y)
    {
        room=x;
        sqft=y;
    }

    input()
    {
        cout<<"Please Enter Room Number: ";
        cin>>room;

        cout<<"Please Enter Size in Squire Feet: ";
        cin>>sqft;
    }

    display()
    {
        cout<<"Room Number: "<<room<<endl;
        cout<<"Room Size: "<<sqft<<" Sqr ft"<<endl;
    }

};


class house:public building
{
    int bedroom;

public:

    house(int x, int y, int z):building(x,y)
    {
        bedroom=z;
    }

    display()
    {
     building::display();
     cout<<"Bedroom Number: "<<bedroom<<endl;
    }

};


class office:public building{
    int ext;
public:
    office(int x, int y, int z):building(x,y)
    {
    ext=z;
    }

    display()
    {
     building::display();
     cout<<"Ext : "<<ext<<endl;
    }

};


int main()
{
    house h(6,1500,4);
    h.display();
}