- Solution

#include <iostream>
class Fraction{
public:
  Fraction(int num = 0, int denom = 0):numerator(num), denominator(denom){}
  friend std::istream& operator>> (std::istream& in, Fraction &frac);
  friend std::ostream& operator<< (std::ostream& out, const Fraction& frac);
private:
  int numerator;
  int denominator;
};
std::istream& operator>> (std::istream& in, Fraction& frac){
  in >> frac.numerator;
  in >> frac.denominator;
  return in;
}
std::ostream& operator<< (std::ostream& out, const Fraction& frac){
    out << frac.numerator << "/" << frac.denominator;
    return out;
}
int main(){
  std::cout << std::endl;
  Fraction frac(3, 4);
  Fraction frac2(7, 8);
  std::cout << "frac(3, 4): " <<  frac << std::endl;
  std::cout << "frac(7, 8): " <<  frac << std::endl;
  std::cout << frac << "   " << frac2 << std::endl;
  std::cout << std::endl;
  std::cout << "Enter two natural numbers for a Fraction: " << std::endl;
  Fraction fracDef;
  std::cin >> fracDef;
  std::cout << "fracDef: " << fracDef << std::endl;
  std::cout << std::endl;
}