#include "iostream.h"

class parent

{int a;

public:

parent(int ta)

{a=ta;

}

void showf()

{cout<<a<<endl;

}
};

class son:public parent

{int b;

public:

son(int ta,int tb):parent(ta)

{b=tb;

}

void shows()

{cout<<b<<endl;

{

};

void main()

{parent *pf;

son *ps;

ps=(son *)pf;

}