using System;

public class Program

{

    public static void Main()

    {

        // Lets do some arbitrary calculations.

        float a = (float)Math.PI;

        float b = (float)Math.Sqrt(a);

        float c = (float)Math.Sqrt(b);

        float d = c * c * c * c;

​

        // --> d should be equal to a, but because of limited precision and numerical errors a != d.

        if (a == d)

          Console.WriteLine("a == d");

        else

          Console.WriteLine("a != d");     // This message is written. :-(

​

​

    }

}