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

    namespace ConsoleStrings
    {
        class Stringklasse
        {
            private string str1;

            public Stringklasse(string str1)
            {
                this.str1 = str1;
            }

            public bool IsPalindroom()
            {
                bool palindroom = true;
                for (int i = 1; i < str1.Length / 2; i++)
                {
                    if (str1[i] != str1[str1.Length - i])
                        palindroom = false;
                }
                return palindroom;
            }

            public bool IsBinair()
            {
                bool binair = true;
                for (int i = 1; i < str1.Length; i++)
                {
                    if (str1[i] != '1' && str1[i] != '0')
                        binair = false;
                }
                return binair;
            }

            public bool BinToDec()
            {
                int decimaal=0;
                int gewicht = 1;
                if (IsBinair() == false)
                    return false;
                for (int i = str1.Length-1; i >=0; i--)
                {
                    decimaal += ((str1[i])-48) * gewicht;
                    gewicht *= 2;
                }
                Console.WriteLine(decimaal);
                return true;
            }

            public bool IsHexadec()
            {
                bool hexadec = true;
                str1=str1.ToUpper();
                for (int i=1;i<str1.Length;i++)
                {
                    char c = str1[i];
                    hexadec = ((c >= '0' && c <= '9') ||
                    (c >= 'A' && c <= 'F'));
                    if(!hexadec)
                     return false;
                }
                return hexadec;
                //return System.Text.RegularExpressions.Regex.IsMatch(str1, @"\A\b[0-9a-fA-F]+\b\Z");
            }

            public bool HexaToDec()
            {
                int decimaal = 0;
                int gewicht = 1;
                int waarde = 0;
                if (!IsHexadec())
                    return false;
                for  ( int i = str1.Length - 1;i>=0;i--)
                {
                    if (str1[i] >= '0' && str1[i] <= '9')
                        waarde = str1[i] - 48;
                    else if (str1[i] >= 'A' && str1[i] <= 'F')
                        waarde = str1[i] - 55;
                    decimaal = waarde * gewicht;
                    gewicht *= 16;
                }
                Console.WriteLine(decimaal);
                return true;
            }
        }
    }