#include <iostream.h>

class Fraction
{  //friend int prod(Fraction* fa, int dim, int Fraction::* nd_ptr);
     friend void opmdemo();
   public:
     Fraction(int a, int b)
     : num(a), denom(b) {}
   private:
     int num;
     int denom;
};

int prod(Fraction* fa, int dim, int Fraction::* nd_ptr)
{   int ans=1;
    for (int i=0 ; i < dim ; i++)
         ans *= fa[i].*nd_ptr;
    return(ans);
}


void opmdemo()
{  Fraction ar[] = {Fraction(1,2), 
                    Fraction(2,5),
                    Fraction(3,7)};
   int np = prod(ar, 3, & Fraction::num);
   int dp = prod(ar, 3, & Fraction::denom);
   cout << np << endl;
   cout << dp << endl;
}

int main()
{   opmdemo();
    return(0);
}