using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var res = BitConverter.GetBytes(3.141f)

            .Reverse()

            .Select(x => Convert.ToString(x, 2))

            .Select(x => x.PadLeft(8, '0'))

            .Aggregate("0b", (a, b) => a + "_" + b);

        Console.WriteLine(res);

    }

}