using System;

public class Program

{

    public static void Main()

    {

        double f1 = Math.Exp(Math.Log(10));

        double f2 = 10;

        double f3 = 10;

​

        Console.WriteLine("{0:G17}",f1);

        Console.WriteLine(f1-10.0);

        Console.WriteLine(f2-f3);

    }

}