1. Kelas turunan Bil_Float Mempunyai satu data member berTipe float...
#include "bilangan.h"
class Bil_float:public Bilangan{
friend ostream & operator<<(ostream&, const Bil_float&);
public:
Bil_float(int aO=O, int bO=O, float cO=O.O):Bilangan (aO,bO),c(cO){}