C# Program to Implement IComparable Interface

/*
 * C# Program to Implement IComparable Interface
 */
using System;
class Fraction : IComparable
{
    int z, n;
 
    public Fraction(int z, int n)
    {
        this.z = z; this.n = n;
    }
 
    public static Fraction operator +(Fraction a, Fraction b)
    {
        return new Fraction(a.z * b.n + a.n * b.z, a.n * b.n);
    }
 
    public static Fraction operator *(Fraction a, Fraction b)
    {
        return new Fraction(a.z * b.z, a.n * b.n);
    }
 
    public int CompareTo(object obj)
    {
        Fraction f = (Fraction)obj;
        if ((float)z / n < (float)f.z / f.n) 
          return -1;
        else if ((float)z / n > (float)f.z / f.n) 
           return 1;
        else return 0;
    }
 
    public override string ToString()
    {
        return z + "/" + n;
    }
}
 
class Test
{
 
   static void Main(string[] arg)
   {
      Fraction[] a = 
      {
      new Fraction(5,2),
      new Fraction(29,6),
      new Fraction(4,5),
      new Fraction(10,8),
      new Fraction(34,7)
      };
        Array.Sort(a);
        Console.WriteLine("Implementing the IComparable Interface in " + 
                          "Displaying Fractions : ");
        foreach (Fraction f in a) Console.WriteLine(f + " ");
        Console.WriteLine();
        Console.ReadLine();
   }
 
}