using System;

public class Program

{

    public static void Main()

    {

        double myNumber = 123.12345;

        Console.WriteLine($"My number is {myNumber:F2}.");

        // Outputs 123.1235 because 123.12345 is rounded up

        Console.WriteLine($"My number is {myNumber:F4}.");

        Console.WriteLine($"My number is {myNumber:F7}.");

    }

}