using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace zSharp2008.zMath
{
    class cMath
    {
        string error = string.Empty;
        public string Error
        {
            get
            {
                return error;
            }
        }
        public int BinaryToDecimal(string data)
        {
            int result = 0;
            char[] numbers = data.ToCharArray();
            try
            {
                if (!IsNumeric(data))
                    error = "Invalid Value - This is not a numeric value";
                else
                {
                    for (int counter = numbers.Length; counter > 0; counter--)
                    {
                        if ((numbers[counter - 1].ToString() != "0") && (numbers[counter - 1].ToString() != "1"))
                            error = "Invalid Value - This is not a binary number";
                        else
                        {
                            int num = int.Parse(numbers[counter - 1].ToString());
                            int exp = numbers.Length - counter;
                            result += (Convert.ToInt16(Math.Pow(2, exp)) * num);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                error = ex.Message;
            }
            return result;
        }

        private bool IsNumeric(string number)
        {
            bool result = false;
            try
            {
                int temp = int.Parse(number);
                result = true;
            }
            catch (Exception ex)
            {
                //Do nothing.
            }
            return result;
        }
    }
}