Decimal to Binary and vice versa

Question

Good day I want to convert decimal to binary number using c# asp.net. I know there is a certain 'CONVERT' method i could to achieve this but is that i want the result with details. For example: decimal to binary (10 to base2) 10 / 2 = 5 R 0 5 / 2 = 2 R 1 2 / 2 = 1 R 0 1 / 2 = 0 R 1 So the corresponding result to 10 = 1010 in base 2. So therefore if a user type in 10 he gets 1010 and how the result was came about. please help ... :) .. Thanks in advance.

Vulpes · Answer

Giwa As requested in your e-mail I've extended the program to cover the 4 additional conversions. Your RadioButtonList1 should now have the following 6 options: 1. Binary to Decimal 2. Decimal to Binary 3. Hex to Decimal 4. Decimal to Hex 5. Hex to Binary 6. Binary to Hex The last 2 don't do much as you can convert between the two just by replacing 4 binary digits with the corresponding hex digit or vice versa - no calculations are necessary. I've altered all the routines to use 'long' rather than 'int' arithmetic so that bigger numbers can be catered for. However there's no overflow checking so don't make them too big! public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender EventArgs e) { } public bool BinToDec(string bin) { if (String.IsNullOrEmpty(bin)) { Label1.Text = Binary number must contain at least one digit; return false; } long total = 0; long pow2 = 1; string text = ; for (int i = bin.Length - 1; i >= 0; i--) { char digit = bin[i]; if (digit != '0' && digit != '1') { Label1.Text = Binary number can only contain 0 or 1; return false; } long product = (digit - 48) * pow2; total += product; text += String.Format({0} x {1} = {2} T {3}
 digit pow2 product total); pow2 *= 2; } text += String.Format(
{0} in decimal is {1} bin total); TextBox2.Text = text; return true; } public bool DecToBin(long dec) { if (dec { Label1.Text = Can't be negative; return false; } long original = dec; List list = new List (); string text = ; do { long div = dec / 2; long rem = dec % 2; text += String.Format({0} / 2 = {1} R {2}
 dec div rem); dec = div; list.Add((char)(rem + 48)); } while (dec > 0); list.Reverse(); string bin = new string(list.ToArray()); text += String.Format(
{0} in binary is {1} original bin); TextBox2.Text = text; return true; } public bool HexToDec(string hex) { if (String.IsNullOrEmpty(hex)) { Label1.Text = Hexadecimal number must contain at least one digit; return false; } hex = hex.ToUpper(); string digits = 0123456789ABCDEF; long total = 0; long pow16 = 1; string text = ; for (int i = hex.Length - 1; i >= 0; i--) { char digit = hex[i]; if (digits.IndexOf(digit) == -1) { Label1.Text = Hexadecimal number can only contain 0 - 9 or A - F; return false; } long product = ((digit total += product; text += String.Format({0} x {1} = {2} T {3}
 digit pow16 product total); pow16 *= 16; } text += String.Format(
0x{0} in decimal is {1} hex total); TextBox2.Text = text; return true; } public bool DecToHex(long dec) { if (dec { Label1.Text = Can't be negative; return false; } string digits = 0123456789ABCDEF; long original = dec; List list = new List (); string text = ; do { long div = dec / 16; long rem = dec % 16; string extra = ; if (rem > 9) extra = ( + digits[(int)rem] + ); text += String.Format({0} / 16 = {1} R {2}{3}
 dec div rem extra); dec = div; list.Add(digits[(int)rem]); } while (dec > 0); list.Reverse(); string hex = new string(list.ToArray()); text += String.Format(
{0} in hexadecimal is 0x{1} original hex); TextBox2.Text = text; return true; } public bool HexToBin(string hex) { if (String.IsNullOrEmpty(hex)) { Label1.Text = Hexadecimal number must contain at least one digit; return false; } hex = hex.ToUpper(); string digits = 0123456789ABCDEF; System.Text.StringBuilder sb = new System.Text.StringBuilder(); for (int i = 0; i { char digit = hex[i]; if (digits.IndexOf(digit) == -1) { Label1.Text = Hexadecimal number can only contain 0 - 9 or A - F; return false; } int number = (digit string nybble = Convert.ToString(number 2).PadLeft(4 '0'); sb.Append(nybble); } string bin = sb.ToString(); string text = ; for (int i = hex.Length - 1; i >= 0; i--) { string nybble = bin.Substring(4 * i 4); text += String.Format({0} = {1}
 hex[i] nybble); } text += String.Format(
0x{0} in binary is {1} hex bin); TextBox2.Text = text; return true; } public bool BinToHex(string bin) { if (String.IsNullOrEmpty(bin)) { Label1.Text = Binary number must contain at least one digit; return false; } for (int i = 0; i { char digit = bin[i]; if (digit != '0' && digit != '1') { Label1.Text = Binary number can only contain 0 or 1; return false; } } string original = bin; int div = bin.Length / 4; int rem = bin.Length % 4; if (rem > 0) { div++; bin = bin.PadLeft(4 * div '0'); } List list = new List (); string text = ; for (int i = bin.Length - 4; i >= 0; i -= 4) { string nybble = bin.Substring(i 4); char digit = Convert.ToInt32(nybble 2).ToString(X)[0]; text += String.Format({0} = {1}
 nybble digit); list.Add(digit); } list.Reverse(); string hex = new string(list.ToArray()); text += String.Format(
{0} in hexadecimal is 0x{1} original hex); TextBox2.Text = text; return true; } protected void Button1_Click(object sender EventArgs e) { Label1.Text = ; TextBox2.Text = ; string number = TextBox1.Text; if (number.Length == 0) { Label1.Text = Please enter the number to be converted; return; } switch (RadioButtonList1.SelectedIndex) // binary to decimal { case 0: // binary to decimal if (!BinToDec(number)) return; break; case 1: // decimal to binary long arg; if (!long.TryParse(number out arg)) { Label1.Text = Not a valid decimal number; return; } if (!DecToBin(arg)) return; break; case 2: // hexadecimal to decimal if (!HexToDec(number)) return; break; case 3: // decimal to hexadecimal long arg2; if (!long.TryParse(number out arg2)) { Label1.Text = Not a valid decimal number; return; } if (!DecToHex(arg2)) return; break; case 4: // hexadecimal to binary if (!HexToBin(number)) return; break; case 5: // binary to hexadecimal if (!BinToHex(number)) return; break; default : // no radiobutton selected Label1.Text = The conversion type has not been selected; return; } TextBox1.Text = ; } }

Vulpes · Answer

Suppose you have the following controls on your web page: 1. A single line textbox TextBox1 for the user to enter the number to be converted. 2. A multi-line textbox TextBox2 to display the results. 3. A label Label1 to display any error messages. 4. A RadioButtonList radiButtonList with 2 buttons to select the conversion type : Binary to Decimal (first button) or Decimal to Binary (second button). 5. A button Button1 for the user to press to start the conversion. If you add a Click handler for the button plus the following code to your 'code behind' file for the page then it should work - notice though that I've had to change the methods a bit: public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender EventArgs e) { } public bool DecToBin (int dec) { if (dec { Label1.Text = Can't be negative; return false; } int original = dec; List list = new List (); string text = ; do { int div = dec / 2; int rem = dec % 2; text += String.Format({0} / 2 = {1} R {2}
 dec div rem); dec = div; list.Add((char)(rem + 48)); } while(dec > 0); list.Reverse(); string bin = new string(list.ToArray()); text += String.Format(
{0} in binary is {1} original bin); TextBox2.Text = text; return true; } public bool BinToDec (string bin) { if (String.IsNullOrEmpty(bin)) { Label1.Text = Binary number must contain at least one digit; return false; } int total = 0; int pow2 = 1; string text = ; for (int i = bin.Length - 1; i >= 0; i--) { char digit = bin[i]; if (digit != '0' && digit != '1') { Label1.Text = Binary number can only contain 0 or 1; return false; } int product = (digit - 48) * pow2; total += product; text += String.Format({0} x {1} = {2} T {3}
 digit pow2 product total); pow2 *= 2; } text += String.Format(
{0} in decimal is {1} bin total); TextBox2.Text = text; return true; } protected void Button1_Click(object sender EventArgs e) { Label1.Text = ; TextBox2.Text = ; string number = TextBox1.Text; if (number.Length == 0) { Label1.Text = Please enter the number to be converted; return; } switch (RadioButtonList1.SelectedIndex) // binary to decimal { case 0: // binary to decimal if (!BinToDec(number)) return; break; case 1: // decimal to binary int arg; if(!int.TryParse(number out arg)) { Label1.Text = Not a valid decimal number; return; } if (!DecToBin(arg)) return; break; default : // no radiobutton selected Label1.Text = The conversion type has not been selected; return; } TextBox1.Text = ; } }

Giwa Abdulhakeem · Answer

Really appreciate your effort. Thanks Brother.

Giwa Abdulhakeem · Answer

A really good one I must say. Kudos to him.

Suthish Nair · Answer

Vulpes you are a good teacher :)

Giwa Abdulhakeem · Answer

I would love to know how to do this on a web page in asp.net c#.

Crish · Answer

good example solution for custom decimal to binary number using c# asp.net.

Vulpes · Answer

With regard to the binary to decimal conversion I'm not sure what format you want the intermediate steps to be in so I've just done what I think: using System; class Test { static void Main() { string bin = 1010; int dec = BinToDec(bin); Console.WriteLine({0} in decimal is {1} bin dec); Console.ReadKey(); } static int BinToDec (string bin) { if (String.IsNullOrEmpty(bin)) throw new ArgumentException(Binary number must contain at least one digit); int total = 0; int pow2 = 1; for (int i = bin.Length - 1; i >= 0; i--) { char digit = bin[i]; if (digit != '0' && digit != '1') throw new ArgumentException(Binary number can only contain 0 or 1); int product = (digit - 48) * pow2; total += product; Console.WriteLine({0} x {1} = {2} T {3} digit pow2 product total); pow2 *= 2; } return total; } }

Vulpes · Answer

This should do the decimal to binary conversion in the form you want it: using System; using System.Collections.Generic; class Test { static void Main() { int dec = 10; string bin = DecToBin(dec); Console.WriteLine({0} in binary is {1} dec bin); Console.ReadKey(); } static string DecToBin (int dec) { if (dec List list = new List (); do { int div = dec / 2; int rem = dec % 2; Console.WriteLine({0} / 2 = {1} R {2} dec div rem); dec = div; list.Add((char)(rem + 48)); } while(dec > 0); list.Reverse(); return new string(list.ToArray()); } }

Giwa Abdulhakeem · Answer

Hi  Thanks for the quick response really appreciate it. From the link you posted i tried the section which say Decimal to Binary and i get this error ' Index was outside the bounds of the array. ' Tried debugging but all to no result. Would really appreciate any help. Cheers

Mahesh Chand · Answer

Check this post: http://www.csharphelp.com/2007/09/converting-between-binary-and-decimal-in-c/