Hex String into number

snorkie

I felt bad about giving a bad answer, so I wrote a whole program to do this. Hope this helps... Sorry I was too lazy to comment the code.

using System;
using System.Collections.Generic;
using System.Text;

namespace ReverseHex
{
class Program
{
static void Main(string[] args)
{
string hexValue = Console.ReadLine();

        int finalNumber = 0;
        int multiplyCount = 0;
        for (int x = hexValue.Length - 1; x >= 0; x--)
        {
            int tempAdd = multiplyCount \* 15;

            switch (hexValue\[x\])
            {
                case '1':
                    finalNumber += tempAdd + 1;
                    break;
                case '2':
                    finalNumber += tempAdd + 2;
                    break;
                case '3':
                    finalNumber += tempAdd + 3;
                    break;
                case '4':
                    finalNumber += tempAdd + 4;
                    break;
                case '5':
                    finalNumber += tempAdd + 5;
                    break;
                case '6':
                    finalNumber += tempAdd + 6;
                    break;
                case '7':
                    finalNumber += tempAdd + 7;
                    break;
                case '8':
                    finalNumber += tempAdd + 8;
                    break;
                case '9':
                    finalNumber += tempAdd + 9;
                    break;
                case 'A':
                case 'a':
                    finalNumber += tempAdd + 10;
                    break;
                case 'B':
                case 'b':
                    finalNumber += tempAdd + 11;
                    break;
                case 'C':
                case 'c':
                    finalNumber += tempAdd + 12;
                    break;
                case 'D':
                case 'd':
                    finalNumber += tempAdd + 13;
                    break;
                case 'E':
                case 'e':
                    finalNumber += tempAdd + 14;
                    break;
                case 'F':
                case 'f':
                    finalNumber += tempAdd + 15;
                    br

leppie

snorkie wrote:

I felt bad about giving a bad answer

Dude, this is a coding horror! ;P Go improve it now!!! Surely you can spot the pattern :)

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 alpha 4a out now (29 May 2008)

snorkie

Its already bad enough that I did his homework for him... I don't want to make it too nice! Hogan

aman2006

Snorkie Thanks for the solution but it is not giving me the correct number still. for Hex string 100000 value should be 16. 060100= 262 1C0000= 28 Any other suggestion please. I am running out of my module time. Please reply. Thanks Shailesh

Brady Kelly

Whew!

Luc Pattyn

Hi, this would be my approach in pseudo-code:

int result=0;
while(stringLength!=0) {
int oneByte=0;
int.TryParse(rightmost2characters, hexSpecifier, out=oneByte);
result=(result<<8)+oneByye;
drop2charsFromString;
}

:)

Luc Pattyn [Forum Guidelines] [My Articles]

Voting for dummies? No thanks. X|

carbon_golem

I'd convert the hex digits into a byte array, figure out what your target Type is, pad/swap as necessary. 24 bit types are a curse on the land handed down from angry gods to punish us for the sins of BIT-BANGERS.... sorry.... X| class Program { static void Main(string[] args) { String s = "100000"; Byte[] temp = new Byte[4]; // int needs 4 bytes Array.Copy(GetBytes(s), 0, temp, 0, 3); // copy in the byte converted string Int32 value = BitConverter.ToInt32(temp, 0); // use BitConverter to change Console.WriteLine(value.ToString()); // format Console.ReadLine(); // wait for non-google searching OP to push something } public static byte[] GetBytes(string hexFormat) { int byteLength = hexFormat.Length / 2; byte[] bytes = new byte[byteLength]; for (int i = 0; i < byteLength; i++) { bytes[i] = AsciiAsHexToByte(new String(new Char[] { hexFormat[i * 2], hexFormat[i * 2 + 1] })); } return bytes; } public static byte AsciiAsHexToByte(string hex) { return byte.Parse(hex, NumberStyles.HexNumber, NumberFormatInfo.CurrentInfo); } }
As you can see, it's a pain to do the conversion. Scott P

“It is practically impossible to teach good programming to students that have had a prior exposure to BASIC: as potential programmers they are mentally mutilated beyond hope of regeneration.” -Edsger Dijkstra

Spacix One

Nothing wrong with a nice For-Case design pattern :) http://thedailywtf.com/Articles/The_FOR-CASE_paradigm.aspx[^]

-Spacix All your skynet questions[^] belong to solved

I dislike the black-and-white voting system on questions/answers. X|

Spacix One

I'll 1/2 do your homework for ya ;)

Imports System
Imports System.Globalization
Imports System.Text

Module Module1
Sub Main()
Dim sb As New StringBuilder("1C0000")
Dim str As String
Dim value As Integer
Dim bval As Byte
Dim j As Double

    If (sb.Length Mod 2) = 1 Then
        sb.Append("0")
    End If
    str = sb.ToString()
    For i As Integer = 1 To str.Length Step 2
        j = Math.Pow(16, Convert.ToDouble(i - 1))
        bval = Byte.Parse(Mid(str, i, 2), NumberStyles.HexNumber, NumberFormatInfo.CurrentInfo)
        value += Convert.ToInt32(Convert.ToDouble(bval) \* j)
    Next
    Console.WriteLine("The string {0} is equal to {1}", sb.ToString(), value)
End Sub

End Module

:laugh: (doh! fixed logic typo)

-Spacix All your skynet questions[^] belong to solved

I dislike the black-and-white voting system on questions/answers. X|

modified on Friday, June 20, 2008 4:25 PM

Guffa · modified on Friday, June 20, 2008 4:25 PM

What's the other half? Converting it to C#? ;)

I dislike the black-and-white voting system on questions/answers.

I agree that it's less nuanced, but on the other hand I see a huge increase in the usage of the voting system. It doesn't matter how good a system is, if noone uses it. :)

Despite everything, the person most likely to be fooling you next is yourself.

Spacix One

Guffa wrote:

What's the other half? Converting it to C#?

You are correct sir! :D There are a few other "optimizations" to be done which I would assume would garner a better grade from the original...

Guffa wrote:

It doesn't matter how good a system is, if noone uses it.

aye, but I think the giant images is what made people start clicking it over the little "Rate this message: {thumb down vote 1} 1 2 3 4 5 {thumb up vote 5}"

-Spacix All your skynet questions[^] belong to solved

I dislike the black-and-white voting system on questions/answers. X|