Domain of a fraction
 two integers
    - numerator
    - denominator 
         denom != 0

      in reduced form

Operations on a fraction
      multiply, divide
      add, subtract

      comparison
      print it out
      set the value
      look at numerator and denominator



struct FractionStruct {
    int num, denom;
};

class FractionT{

     public:
         FractionT Add(FractionT);
         int Numerator(void);
         void Print();

     protected:
     private:
         BigNumberT num, denom;

};