Convert integer to hexadecimal and back again

Question

How can I convert the following   2934  integer   to   B76  hex   Let me explain what I am trying to do  I have User IDs in my database that are stored as integers  Rather than having users reference their IDs I want to let them use the hex value  The main reason is because it s shorter   So not only do I need to go from integer to hex but I also need to go from hex to integer   Is there an easy way to do this in C

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To Hex   string hex   intValue ToString  X      To int   int intValue   int Parse hex  System Globalization NumberStyles HexNumber

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int valInt   12  Console WriteLine valInt ToString  X         C    possibly single-digit output  Console WriteLine valInt ToString  X2        0C   always double-digit output

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string HexFromID int ID        return ID ToString  X       int IDFromHex string HexID        return int Parse HexID  System Globalization NumberStyles HexNumber       I really question the value of this  though   You re stated goal is to make the value shorter  which it will  but that isn t a goal in itself   You really mean either make it easier to remember or easier to type   If you mean easier to remember  then you re taking a step backwards   We know it s still the same size  just encoded differently   But your users won t know that the letters are restricted to  A-F   and so the ID will occupy the same conceptual space for them as if the letter  A-Z  were allowed   So instead of being like memorizing a telephone number  it s more like memorizing a GUID  of equivalent length    If you mean typing  instead of being able to use the keypad the user now must use the main part of the keyboard   It s likely to be more difficult to type  because it won t be a word their fingers recognize   A much better option is to actually let them pick a real username

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Store integer 182 int intValue   182     Convert integer 182 as a hex in a string variable string hexValue   intValue ToString  X       Convert the hex string back to the number int intAgain   int Parse hexValue  System Globalization NumberStyles HexNumber     from http   www geekpedia com KB8 How-do-I-convert-from-decimal-to-hex-and-hex-to-decimal html

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Print integer in hex-value with zero-padding  if needed      int intValue   1234   Console WriteLine   0 0 D4   0 0 X3    intValue      https   docs microsoft com en-us dotnet standard base-types how-to-pad-a-number-with-leading-zeros

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Try the following to convert it to hex  public static string ToHex this int value      return String Format  0x 0 X    value       And back again  public static int FromHex string value         strip the leading 0x   if   value StartsWith  0x   StringComparison OrdinalIgnoreCase         value   value Substring 2         return Int32 Parse value  NumberStyles HexNumber

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int to hex   int a   72  Console WriteLine  quot  0 X  quot   a    hex to int   int b   0xB76  Console WriteLine b

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I created my own solution for converting int to Hex string and back before I found this answer  Not surprisingly  it s considerably faster than the  net solution since there s less code overhead                lt summary gt              Convert an integer to a string of hexidecimal numbers               lt  summary gt               lt param name  n  gt The int to convert to Hex representation lt  param gt               lt param name  len  gt number of digits in the hex string  Pads with leading zeros  lt  param gt               lt returns gt  lt  returns gt          private static String IntToHexString int n  int len                        char   ch   new char len--               for  int i   len  i  gt   0  i--                                ch len - i    ByteToHexChar  byte   uint  n  gt  gt  4   i   amp  15                              return new String ch                           lt summary gt              Convert a byte to a hexidecimal char              lt  summary gt               lt param name  b  gt  lt  param gt               lt returns gt  lt  returns gt          private static char ByteToHexChar byte b                        if  b  lt  0    b  gt  15                  throw new Exception  IntToHexChar  input out of range for Hex value                return b  lt  10    char  b   48     char  b   55                           lt summary gt              Convert a hexidecimal string to an base 10 integer              lt  summary gt               lt param name  str  gt  lt  param gt               lt returns gt  lt  returns gt          private static int HexStringToInt String str                        int value   0              for  int i   0  i  lt  str Length  i                                  value    HexCharToInt str i    lt  lt    str Length - 1 - i    4                             return value                          lt summary gt              Convert a hex char to it an integer               lt  summary gt               lt param name  ch  gt  lt  param gt               lt returns gt  lt  returns gt          private static int HexCharToInt char ch                        if  ch  lt  48     ch  gt  57  amp  amp  ch  lt  65     ch  gt  70                  throw new Exception  HexCharToInt  input out of range for Hex value                return  ch  lt  58    ch - 48   ch - 55              Timing code   static void Main string   args                        int num   3500              long start   System Diagnostics Stopwatch GetTimestamp                for  int i   0  i  lt  2000000  i                    if  num    HexStringToInt IntToHexString num  3                        Console WriteLine num           HexStringToInt IntToHexString num  3                 long end   System Diagnostics Stopwatch GetTimestamp                Console WriteLine   double end -  double start   double System Diagnostics Stopwatch Frequency                for  int i   0  i  lt  2000000  i                    if  num    Convert ToInt32 num ToString  X3    16                       Console WriteLine i               end   System Diagnostics Stopwatch GetTimestamp                Console WriteLine   double end -  double start   double System Diagnostics Stopwatch Frequency               Console ReadLine                 Results   Digits   MyCode    Net 1   0 21   0 45 2   0 31   0 56 4   0 51   0 78 6   0 70   1 02 8   0 90   1 25

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NET FRAMEWORK     Very well explained and few programming lines   GOOD JOB      Store integer 182 int intValue   182     Convert integer 182 as a hex in a string variable string hexValue   intValue ToString  X       Convert the hex string back to the number int intAgain   int Parse hexValue  System Globalization NumberStyles HexNumber     PASCAL    C      http   files hddguru com download Software Seagate St mem pas   Something from the old school very old procedure of pascal converted to C             lt summary gt          Conver number from Decadic to Hexadecimal          lt  summary gt           lt param name  w  gt  lt  param gt           lt returns gt  lt  returns gt      public string MakeHex int w                try                      char   b      0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F               char   S   new char 7                  S 0    b  w  gt  gt  24   amp  15                 S 1    b  w  gt  gt  20   amp  15                 S 2    b  w  gt  gt  16   amp  15                 S 3    b  w  gt  gt  12   amp  15                 S 4    b  w  gt  gt  8   amp  15                 S 5    b  w  gt  gt  4   amp  15                 S 6    b w  amp  15                  string  MakeHex   new string S  0  S Count                    return  MakeHex                    catch  Exception ex                         throw

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Use   int myInt   2934  string myHex   myInt ToString  X        Gives you hexadecimal int myNewInt   Convert ToInt32 myHex  16       Back to int again    See How to  Convert Between Hexadecimal Strings and Numeric Types  C  Programming Guide  for more information and examples

[c#] Convert integer to hexadecimal and back again

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