SINGLE LEVEL INHERITENCE(PUBLIC)

  //SINGLE LEVEL INHERITENCE(PUBLIC)
//A BASIC PROGRAM OF SINGLE LEVEL INHERITENCE HERE WE HAVE INHERITED
//THE BASE CLASS PUBLICALY . SO THAT THE PUBLIC MEMBERS OF THE BASE CLASS BECOME
//THE PUBLIC MEMBERS OF THE DERIVED CLASS
/*MADE BY KRISHNA AGARWAL*/
#include<iostream.h>
#include<conio.h>
class B
{
    int a; //private; not inheritable
    public:
    int b; //public; ready for inheritence
    void set_ab();
    int get_a(void);
    void show_a(void);
};
class D:public B   //public declaration
{
    int c;
    public:
    void mul(void);
    void display(void);
};
//HERE THE CLASS B ENDS AND THE CLASS B BEGINS
void B::set_ab(void)
{
    a=5;
    b=10;
}
int B::get_a()
{
    return a;
}
void B::show_a()
{
    cout<<"a =  "<<a<<"\n";
}
void D::mul()
{
    c=b*get_a();
}
void D::display()
{
    cout<<"a = "<<get_a()<<"\n";
    cout<<"b = "<<b<<"\n";
    cout<<"c = "<<c<<"\n";
}
//-------------------------------------------------
//HERE THE MAIN BEGINS
void main()
{
    clrscr();
    D d;
    d.set_ab();
    d.mul();
    d.show_a();
    d.display();
    d.b=20;
    d.mul();
    d.display();
    getch();
}