FY-5-a Easy C++ program to design a class for single level inheritance

#include
using namespace std;
class Base
{
    int n, r;
    public:
        void get()
        {
            cout<<"Enter any number : ";
            cin>>n;
        }
        void square()
        {
            r=n*n;
            disp();
        }
    private:
        void disp()
        {
            cout<<endl<<"Square of "<<n<<" is "<<r;
        }
};
class Derived:public Base
{
    int b;
};
int main()
{
    Derived d;
    d.get();
    d.square();
    return 0;
}