#include<iostream.h>
class a
{public:
virtual void print()
{cout<< "a prog..."<< endl;};
};
class b:public a
{};
class c:public b
{public:
void print(){cout<<"c prog..."<<endl;}
};
void show(a *p)
{(*p).print();
}
void main()
{a a;
b b;
c c;
show(&a);
show(&b);
show(&c);
}
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