NumeralSystems-07

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

namespace _07.SbaseToDbaseSystem
{
    class Program
    {
        //Write a program to convert from any numeral system of given base s to any other numeral system of base d (2 ≤ s, d ≤  16).

        static int sBase;// = VerifyInputBase();
        static string inputNumber; // = VerifyInputNumber();
        static int dBase;// = VerifyInputBase();
        static int resultDecimal;// = ConvertSbaseToDecimal();
        static string resultNumber;

        static int VerifyInputBase()
        {
            int input;
            while (true)
            {
                Console.Write("Please enter number for based system [2;16]: ");
                if (int.TryParse(Console.ReadLine(), out input) && (input >= 2 && input <= 16))
                {
                    break;
                }
                else
                {
                    Console.WriteLine("Invalid Input!Try Again!\n");
                }
            }
            Console.WriteLine();
            return input;
        }

        static string VerifyInputNumber()
        {
            string input = "";
            while (true)
            {
                Console.WriteLine("Please enter number in {0} based system", sBase);
                Console.Write("The input digits should be in range [0;{0}] ", sBase - 1);
                if (sBase > 10)
                {
                    string letter = "";
                    if (sBase == 11) letter = "A";
                    else if (sBase == 12) letter = "B";
                    else if (sBase == 13) letter = "C";
                    else if (sBase == 14) letter = "D";
                    else if (sBase == 15) letter = "E";
                    else if (sBase == 16) letter = "F";
                    Console.Write("and [A;{0}]: ", letter);
                }
                input = Console.ReadLine();

                int correct = 0;
                for (int i = 0; i < input.Length; i++)
                {
                    if ((input[i] - '0' >= 0 && input[i] - '0' <= sBase - 1) || (input[i] - 'A' >= 0 && input[i] - 'A' < (sBase - 10)))
                    {
                        correct++;
                    }
                }
                if (correct == input.Length)
                {
                    break;
                }
                else
                {
                    Console.WriteLine("Invalid enter!Try again!\n");
                }
            }
            Console.WriteLine();
            return input;
        }

        static int ConvertSbaseToDecimal()
        {
            int powerOfSbase = 1;
            int tempNimber = 0;
            for (int i = inputNumber.Length - 1; i >= 0; i--)
            {
                if (int.TryParse(inputNumber[i].ToString(), out tempNimber))
                {
                    resultDecimal += tempNimber * powerOfSbase;
                    powerOfSbase *= sBase;
                }
                else
                {
                    resultDecimal += (inputNumber[i] - 'A' + 10) * powerOfSbase;
                    powerOfSbase *= sBase;
                }
            }
            return resultDecimal;
        }

        static string ConvertDecimalToDbase()
        {
            while (resultDecimal > 0)
            {
                if (resultDecimal % dBase == 10)
                {
                    resultNumber += "A";
                }
                else if (resultDecimal % dBase == 11)
                {
                    resultNumber += "B";
                }
                else if (resultDecimal % dBase == 12)
                {
                    resultNumber += "C";
                }
                else if (resultDecimal % dBase == 13)
                {
                    resultNumber += "D";
                }
                else if (resultDecimal % dBase == 14)
                {
                    resultNumber += "E";
                }
                else if (resultDecimal % dBase == 15)
                {
                    resultNumber += "F";
                }
                else
                {
                    resultNumber += (resultDecimal % dBase).ToString();
                }
                resultDecimal /= dBase;
            }
            return resultNumber;
        }

        static void PrintResult(string resultNumber)
        {
            for (int i = resultNumber.Length - 1; i >= 0; i--)
            {
                Console.Write(resultNumber[i]);
            }
        }

        static void Main()
        {
            sBase = VerifyInputBase();
            inputNumber = VerifyInputNumber();
            dBase = VerifyInputBase();
            resultDecimal = ConvertSbaseToDecimal();
            resultNumber = ConvertDecimalToDbase();
            Console.WriteLine();
            if (dBase == sBase)
            {
                Console.Write("{0} -> {0} ", inputNumber);
            }
            else
            {
                Console.WriteLine("The result is: ");
                Console.Write("{0} -> ", inputNumber);
                PrintResult(resultNumber);
            }
            Console.WriteLine();
        }
    }
}