using System;

using System.Text;

using System.Globalization;

using System.Threading;

using System.Linq;

using StringExtensions;

​

public class Program

{

    public static void Main()

    {   

        var res = ("300".FormatStringToDouble() + 1.2).ToString();

        var res2 = ("300".FormatStringToDouble() - 1.2).ToString();     

        Console.WriteLine(res.ToString());

        Console.WriteLine(res2.ToString());

        Console.WriteLine(res.FormatStringToDouble());

        res = (res.FormatStringToDouble() + 1.2).ToString();

        res2 = (res2.FormatStringToDouble() - 1.2).ToString();

        Console.WriteLine(res.ToString());

        Console.WriteLine(res2.ToString());

    }

}

​

namespace StringExtensions

    {

        public static class StringExtensions

        {

            public static double FormatStringToDouble(this string str)

        {

            try

            {

                return Convert.ToDouble(str.Replace('.', ','));

            }

            catch

            {

                return 0;

            }

        }

            public static string[] SplitToArray(this string fullString, int size, int arrayLength)

            {

                var splitedDescription = fullString.Split('\n');

                string[] description = new string[arrayLength];

​

                var i = 0;

                foreach (var item in splitedDescription)

                {

                    if (item.Length > 79)

                    {

                        //SplitToArray(item, size, (item.Count() / size));

                        var idxToCut = 0;

​

                        var j = 78;

                        var breakLine = false;

                        do

                        {

                            if (item[j] != ' ')

                            {

                                j--;

                            }

                            else

                            {

                                breakLine = true;

                                idxToCut = j;

                            }

​

                        } while (breakLine == false);

​

                        description[i] = item.Substring(0, idxToCut);

                        i++;

​

                        if (i < arrayLength)

                            description[i] = item.Substring(idxToCut);

                    }

​

                    if (i < arrayLength)

                        description[i] = item;

                    i++;

                }

                return description;

            }

​

        }

    }