method that convert from any base to base 10

[PRINCE01]

I need instance method(s) within the class am writing that convert from any base to base 10 & vice versa WIThOUT USING ANY LIBRARY ROUTINE.

//this is  what i have so far
private int DecimalToBinary(int Decimal, int BaseNumber) 
      {
         int Reminder;
         do
         {
            Reminder = Decimal % BaseNumber;
         }
         while (Reminder > 0);
         return.......; //need help on how to get/pick  all the reminder together after above loop is excuted  ?

[ddanbe]

This site should give you a very good idea how to do it.
Hint: Try to remember the outcome of your divisions and then print them out.

[cassandy]

I need instance method(s) within the class am writing that convert from any base to base 10 & vice versa WIThOUT USING ANY LIBRARY ROUTINE.

//this is what i have so far
private int DecimalToBinary(int Decimal, int BaseNumber)
{
int Reminder;
do
{
Reminder = Decimal % BaseNumber;
}
while (Reminder > 0);
return.......; //need help on how to get/pick all the reminder together after above loop is excuted ?

you're done after appending to the result. here are two ways to append the digits.

1. collect the digits with StringBuilder, then convert to int with int.Parse.

   var result = new StringBuilder();
   
   if (value != 0)
   {
       while (value != 0)
       {
           result.Append(GetDigit(value, radix));
           value /= radix;
       }
   }
   else
   {
       result.Append("0");
   }
   
   return int.Parse(result.ToString());

2. collect the digits directly into another int.

   int result = 0;
   
   if (value != 0)
   {
       while (value != 0)
       {
           result = 10 * result + (GetDigit(value, radix) - '0');
           value /= radix;
       }
   }
   
   return result;

#1 is easier to get right, but #2 is a lot faster.

i don't mind giving you code because you've got it mostly done and i think the real exercise is breaking the number down into digits anyway.

here's a fun little program that converts an int into a string of any base from 0 to 36 and even base64 like Convert.ToBase64String. it might give you some ideas. :)

using System;
using System.Text;

namespace Test
{
    static class Program
    {
        static void Main()
        {
            int value = 5069456;

            for (int i = 1; i < 38; i++)
            {
                try
                {
                    Console.WriteLine("base {0:00}: {1}", i, value.ToBase(i));
                }
                catch (ArgumentOutOfRangeException ex)
                {
                    Console.WriteLine(ex.Message);
                }
                catch (Exception ex)
                {
                    Console.WriteLine("unexpected exception: " + ex.Message);
                }
            }

            Console.WriteLine("base 64: {0}", Convert.ToBase64String(BitConverter.GetBytes(value)));
        }

        /// <summary>
        /// encodes an int value to the requested radix
        /// </summary>
        /// <remarks>
        /// base 2 to 36 and base64 are supported
        /// base64 follows RFC4648 rules
        /// </remarks>
        /// <param name="value">int value to encode</param>
        /// <param name="radix">radix for the encoding</param>
        /// <returns>base[radix] encoded string</returns>
        static string ToBase(this int value, int radix)
        {
            if (radix != 64 && (radix < 2 || radix > 36))
            {
                throw new ArgumentOutOfRangeException(
                    "invalid radix [" + radix + "]." + Environment.NewLine +
                    "radix must be either 64 or between 2 and 36.");
            }

            // handle RFC4648 base64
            if (radix == 64) return value.ToBase64();

            // this algorithm doesn't like 0, just return tostring
            if (value == 0) return value.ToString();

            const string baseChars =
                "0123456789" +
                "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

            var result = new StringBuilder();
            int temp = value;

            // strips and encodes each digit based on the radix
            while (temp != 0)
            {
                result.Append(baseChars[temp % radix]);
                temp /= radix;
            }

            // the encoded string is backward after the loop
            return result.ToString().Reverse();
        }

        /// <summary>
        /// encodes an int value using RFC4648 base64 encoding
        /// </summary>
        /// <param name="value">int value to encode</param>
        /// <returns>base64 encoded string</returns>
        static string ToBase64(this int value)
        {
            const string baseChars =
                "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
                "abcdefghijklmnopqrstuvwxyz" +
                "0123456789";
            const char padding = '=';

            byte[] bytes = BitConverter.GetBytes(value);
            var retval = new StringBuilder();

            for (int i = 0; i < bytes.Length; i += 3)
            {
                byte[] workingSet = new byte[3];  // 8-bit bytes to be encoded
                byte[] sixBitGroup = new byte[4]; // 6-bit regrouping into 4 bytes

                // gets the next 3 bytes from the bytestream with
                workingSet[0] = bytes[i];
                workingSet[1] = (i + 1 < bytes.Length) ? bytes[i + 1] : (byte)0;
                workingSet[2] = (i + 2 < bytes.Length) ? bytes[i + 2] : (byte)0;

                // regroup the 8-bit bytes into 6-bit bytes
                sixBitGroup[0] = (byte)(workingSet[0] >> 2);
                sixBitGroup[1] = (byte)(((workingSet[0] & 0x3) << 4) | (workingSet[1] >> 4));
                sixBitGroup[2] = (byte)(((workingSet[1] & 0xf) << 2) | (workingSet[2] >> 6));
                sixBitGroup[3] = (byte)(workingSet[2] & 0x3f);

                // encode the 6-bit bytes using base64 chars
                retval.Append(baseChars[sixBitGroup[0]]);
                retval.Append(baseChars[sixBitGroup[1]]);
                retval.Append((i + 1 < bytes.Length) ? baseChars[sixBitGroup[2]] : padding);
                retval.Append((i + 1 < bytes.Length) ? baseChars[sixBitGroup[3]] : padding);
            };

            return retval.ToString();
        }

        /// <summary>
        /// reverses the characters in a string
        /// </summary>
        /// <param name="s">original string</param>
        /// <returns>reversed string</returns>
        static string Reverse(this string s)
        {
            char[] chars = s.ToCharArray();

            Array.Reverse(chars);

            return new string(chars);
        }
    }
}

[PRINCE01]

Cassandy
Thanks for your reponse.your codes really help .Good job!