using System;

public class Program

{

    public static void Main()

    {

     Console.WriteLine(PoundPence(2.3));

    }

​

public static string PoundPence(double dec)

    {

    string number = Convert.ToString(dec);

        if(number.Length ==1)

        {

            return "£" + number + "00";

        }

        else if(number.Length ==3 )

        {

            return "£" + number + "0";

        }

        else if( number.Length ==4)

        {

            return "£" + number;

        }

        else    

        {

            return "error"

        }

}

}

​