using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StageController
{
    public class Tools
    {
        public static string CutDecimalWithNToString(decimal d, int n)
        {
            return CutDecimalWithN(d, n).ToString();
        }

        public static decimal CutDecimalWithN(decimal d, int n)
        {
            string strDecimal = d.ToString();
            int index = strDecimal.IndexOf(".");
            if (index == -1 || strDecimal.Length < index + n + 1)
            {
                strDecimal = string.Format("{0:F" + n + "}", d);
            }
            else
            {
                int length = index;
                if (n != 0)
                {
                    length = index + n + 1;
                }
                strDecimal = strDecimal.Substring(0, length);
            }
            return Decimal.Parse(strDecimal);
        }

    }
}