// base class pointer can point to derived class
#include<iostream.h>
class base
{
public:
int a;
void show()
{
cout<<"\n From base class";
cout<<"\n value of a is:"<<a;
cout<<endl;
}
}
;
class derived:public base
{
public:
int b;
void show()
{
cout<<"\n From derived class :";
cout<<"\n value of b is :"<<b;
cout<<endl;
}
}
;
void main()
{
base bbb;
derived ddd;
base *ptr;
ptr=&bbb;
ptr->a=10;
ptr->show();
ptr=&ddd;
ptr->a=20;
// ptr->b=35; error
ptr->show();
}
Test data
From base class
value of a is : 10
From base class
value of a is : 20
