using System;

namespace Fraction
{
    class Fraction
    {
        private int numerator;
        private int denominator;

        // create a fraction by passing in the numerator
        // and denominator
        public Fraction(int numerator, int denominator)
        {
            this.numerator = numerator;
            this.denominator = denominator;
        }

        // Overloaded operator- takes two fractions
        // and returns their sum
        public static Fraction operator -(Fraction lhs, Fraction rhs)
        {
            // Like fractions (shared denominator) can be added
            // by adding their numerators
            if (lhs.denominator == rhs.denominator)
            {
                return new Fraction(lhs.numerator - rhs.numerator,
                    lhs.denominator);
            }

            // Simplistic solution for unlike fractions
            int firstProduct = lhs.numerator * rhs.denominator - rhs.numerator * lhs.denominator;
            int secondProduct = lhs.denominator * rhs.denominator;
            return new Fraction(firstProduct, secondProduct);

        }

        // Return a string representation of the fraction
        public override string ToString()
        {
            String s = numerator.ToString() + "/" +
                denominator.ToString();
            return s;
        }
    }
    public class Tester
    {
        public void Run()
        {
            Fraction f1 = new Fraction(1, 2);
            Console.WriteLine("f1: {0}", f1.ToString());

            Fraction f2 = new Fraction(1, 6);
            Console.WriteLine("f2: {0}", f2.ToString());

            Fraction f3 = f1 - f2;
            Console.WriteLine("f1 - f2 = f3: {0}", f3.ToString());

        }
        static void Main()
        {
            Tester t = new Tester();
            t.Run();

            Console.ReadLine();
        }
    }
}