How to convert numbers between hexadecimal and decimal

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How do you convert between hexadecimal numbers and decimal numbers in C

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It looks like you can say  Convert ToInt64 value  16    to get the decimal from hexdecimal   The other way around is   otherVar ToString  X

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To convert from decimal to hex do     string hexValue   decValue ToString  X      To convert from hex to decimal do either     int decValue   int Parse hexValue  System Globalization NumberStyles HexNumber     or    int decValue   Convert ToInt32 hexValue  16

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My solution is a bit like back to basics  but it works without using any built-in functions to convert between number systems       public static string DecToHex long a                int n   1          long b   a          while  b  gt  15                        b    16              n                      string   t   new string n           int i   0  j   n - 1          do                            if  a   16    10  t i     A               else if  a   16    11  t i     B               else if  a   16    12  t i     C               else if  a   16    13  t i     D               else if  a   16    14  t i     E               else if  a   16    15  t i     F               else t i     a   16  ToString                a    16              i                      while   a   16   gt  15           string   r   new string n           for  i   0  i  lt  n  i                          r i    t j               j--                    string res   string Concat r           return res

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From Geekpedia      Store integer 182 int decValue   182      Convert integer 182 as a hex in a string variable string hexValue   decValue ToString  X        Convert the hex string back to the number int decAgain   int Parse hexValue  System Globalization NumberStyles HexNumber

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static string chex byte e                      Convert a byte to a string representing that byte in hexadecimal               string r               string chars    0123456789ABCDEF           r    chars e  gt  gt  4           return r    chars e  amp   0x0F                      Easy enough         static byte CRAZY BYTE string t  int i         Take a byte  if zero return zero  else throw exception  i 0 means false  i gt 0 means true                if  i    0  return 0          throw new Exception t              static byte hbyte string e                     Take 2 characters  these are hex chars  convert it to a byte                                                    WARNING  This code will make small children cry  Rated R          e   e ToUpper                string msg    INVALID CHARS                The message that will be thrown if the hex str is invalid          byte   t   new byte                        Gets the 2 characters and puts them in seperate entries in a byte array                                                     This will throw an exception if  e Length    2                byte e CRAZY BYTE  INVALID LENGTH   e Length   0x02                  byte e 0x01                       for  byte i   0x00  i  lt  0x02  i            Convert those  ascii  characters to  hexadecimal  characters  Error out if either character is invalid                        t i  -   byte   t i   gt   0x30    0x30   CRAZY BYTE msg  0x01                                        Check for 0-9             t i  -   byte     t i   lt  0x0A      t i   gt   0x11   0x07   CRAZY BYTE msg  0x01     0x00             Check for A-F                               return t 0x01     t 0x00   lt  lt   0x04         The moment of truth

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Hex to Decimal Conversion  Convert ToInt32 number  16     Decimal to Hex Conversion  int Parse number  System Globalization NumberStyles HexNumber    For more details Check this article

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Try using BigNumber in C  - Represents an arbitrarily large signed integer   Program  using System Numerics      var bigNumber   BigInteger Parse  837593454735734579347547357233757342857087879423437472347757234945743    Console WriteLine bigNumber ToString  X       Output  4F30DC39A5B10A824134D5B18EEA3707AC854EE565414ED2E498DCFDE1A15DA5FEB6074AE248458435BD417F06F674EB29A2CFECF   Possible Exceptions   ArgumentNullException - value is null   FormatException - value is not in the correct format   Conclusion  You can convert string and store a value in BigNumber without constraints about the size of the number unless the string is empty and non-analphabets

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If it s a really big hex string beyond the capacity of the normal integer   For  NET 3 5  we can use BouncyCastle s BigInteger class   String hex    68c7b05d0000000002f8      results in  494809724602834812404472  String decimal   new Org BouncyCastle Math BigInteger hex  16  ToString       NET 4 0 has the BigInteger class

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Hex -  decimal   Convert ToInt64 hexValue  16     Decimal -  Hex  string format   0 x    decValue

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If it s a really big hex string beyond the capacity of the normal integer   For  NET 3 5  we can use BouncyCastle s BigInteger class   String hex    68c7b05d0000000002f8      results in  494809724602834812404472  String decimal   new Org BouncyCastle Math BigInteger hex  16  ToString       NET 4 0 has the BigInteger class

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From Geekpedia      Store integer 182 int decValue   182      Convert integer 182 as a hex in a string variable string hexValue   decValue ToString  X        Convert the hex string back to the number int decAgain   int Parse hexValue  System Globalization NumberStyles HexNumber

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From Geekpedia      Store integer 182 int decValue   182      Convert integer 182 as a hex in a string variable string hexValue   decValue ToString  X        Convert the hex string back to the number int decAgain   int Parse hexValue  System Globalization NumberStyles HexNumber

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Try using BigNumber in C  - Represents an arbitrarily large signed integer   Program  using System Numerics      var bigNumber   BigInteger Parse  837593454735734579347547357233757342857087879423437472347757234945743    Console WriteLine bigNumber ToString  X       Output  4F30DC39A5B10A824134D5B18EEA3707AC854EE565414ED2E498DCFDE1A15DA5FEB6074AE248458435BD417F06F674EB29A2CFECF   Possible Exceptions   ArgumentNullException - value is null   FormatException - value is not in the correct format   Conclusion  You can convert string and store a value in BigNumber without constraints about the size of the number unless the string is empty and non-analphabets

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Convert binary to Hex  Convert ToString Convert ToUInt32 binary1  2   16  ToUpper

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My version is I think a little more understandable because my C  knowledge is not so high  I m using this algorithm  http   easyguyevo hubpages com hub Convert-Hex-to-Decimal  The Example 2   using System  using System Collections Generic   static class Tool       public static string DecToHex int x                string result                while  x    0                        if   x   16   lt  10                  result   x   16   result              else                               string temp                        switch  x   16                                        case 10  temp    A   break                      case 11  temp    B   break                      case 12  temp    C   break                      case 13  temp    D   break                      case 14  temp    E   break                      case 15  temp    F   break                                     result   temp   result                             x    16                     return result             public static int HexToDec string x                int result   0          int count   x Length - 1          for  int i   0  i  lt  x Length  i                          int temp   0              switch  x i                                 case  A   temp   10  break                  case  B   temp   11  break                  case  C   temp   12  break                  case  D   temp   13  break                  case  E   temp   14  break                  case  F   temp   15  break                  default  temp   -48    int x i   break     -48 because of ASCII                            result    temp    int  Math Pow 16  count                count--                     return result           class Program       static void Main string   args                Console Write  Enter Decimal value              int decNum   int Parse Console ReadLine              Console WriteLine  Dec  0  is hex  1    decNum  Tool DecToHex decNum             Console Write   nEnter Hexadecimal value              string hexNum   Console ReadLine   ToUpper             Console WriteLine  Hex  0  is dec  1    hexNum  Tool HexToDec hexNum             Console ReadKey

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To convert from decimal to hex do     string hexValue   decValue ToString  X      To convert from hex to decimal do either     int decValue   int Parse hexValue  System Globalization NumberStyles HexNumber     or    int decValue   Convert ToInt32 hexValue  16

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It looks like you can say  Convert ToInt64 value  16    to get the decimal from hexdecimal   The other way around is   otherVar ToString  X

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String stringrep   myintvar ToString  X     int num   int Parse  FF   System Globalization NumberStyles HexNumber

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class HexToDecimal       static void Main                 while  true                        Console Write  Enter digit number to convert                  int n   int Parse Console ReadLine        set hexadecimal digit number               Console Write  Enter hexadecimal number                  string str   Console ReadLine                str Reverse                 char   ch   str ToCharArray                int   intarray   new int n                decimal decimalval   0               for  int i   ch Length - 1  i  gt   0  i--                                if  ch i      0                       intarray i    0                  if  ch i      1                       intarray i    1                  if  ch i      2                       intarray i    2                  if  ch i      3                       intarray i    3                  if  ch i      4                       intarray i    4                  if  ch i      5                       intarray i    5                  if  ch i      6                       intarray i    6                  if  ch i      7                       intarray i    7                  if  ch i      8                       intarray i    8                  if  ch i      9                       intarray i    9                  if  ch i      A                       intarray i    10                  if  ch i      B                       intarray i    11                  if  ch i      C                       intarray i    12                  if  ch i      D                       intarray i    13                  if  ch i      E                       intarray i    14                  if  ch i      F                       intarray i    15                   decimalval    intarray i     decimal Math Pow 16  ch Length - 1 - i                               Console WriteLine decimalval

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String stringrep   myintvar ToString  X     int num   int Parse  FF   System Globalization NumberStyles HexNumber

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My solution is a bit like back to basics  but it works without using any built-in functions to convert between number systems       public static string DecToHex long a                int n   1          long b   a          while  b  gt  15                        b    16              n                      string   t   new string n           int i   0  j   n - 1          do                            if  a   16    10  t i     A               else if  a   16    11  t i     B               else if  a   16    12  t i     C               else if  a   16    13  t i     D               else if  a   16    14  t i     E               else if  a   16    15  t i     F               else t i     a   16  ToString                a    16              i                      while   a   16   gt  15           string   r   new string n           for  i   0  i  lt  n  i                          r i    t j               j--                    string res   string Concat r           return res

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String stringrep   myintvar ToString  X     int num   int Parse  FF   System Globalization NumberStyles HexNumber

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An extension method for converting a byte array into a hex representation  This pads each byte with leading zeros            lt summary gt          Turns the byte array into its Hex representation           lt  summary gt      public static string ToHex this byte   y                StringBuilder sb   new StringBuilder            foreach  byte b in y                        sb Append b ToString  X   PadLeft 2   0  0                       return sb ToString

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static string chex byte e                      Convert a byte to a string representing that byte in hexadecimal               string r               string chars    0123456789ABCDEF           r    chars e  gt  gt  4           return r    chars e  amp   0x0F                      Easy enough         static byte CRAZY BYTE string t  int i         Take a byte  if zero return zero  else throw exception  i 0 means false  i gt 0 means true                if  i    0  return 0          throw new Exception t              static byte hbyte string e                     Take 2 characters  these are hex chars  convert it to a byte                                                    WARNING  This code will make small children cry  Rated R          e   e ToUpper                string msg    INVALID CHARS                The message that will be thrown if the hex str is invalid          byte   t   new byte                        Gets the 2 characters and puts them in seperate entries in a byte array                                                     This will throw an exception if  e Length    2                byte e CRAZY BYTE  INVALID LENGTH   e Length   0x02                  byte e 0x01                       for  byte i   0x00  i  lt  0x02  i            Convert those  ascii  characters to  hexadecimal  characters  Error out if either character is invalid                        t i  -   byte   t i   gt   0x30    0x30   CRAZY BYTE msg  0x01                                        Check for 0-9             t i  -   byte     t i   lt  0x0A      t i   gt   0x11   0x07   CRAZY BYTE msg  0x01     0x00             Check for A-F                               return t 0x01     t 0x00   lt  lt   0x04         The moment of truth

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Hex -  decimal   Convert ToInt64 hexValue  16     Decimal -  Hex  string format   0 x    decValue

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String stringrep   myintvar ToString  X     int num   int Parse  FF   System Globalization NumberStyles HexNumber

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My version is I think a little more understandable because my C  knowledge is not so high  I m using this algorithm  http   easyguyevo hubpages com hub Convert-Hex-to-Decimal  The Example 2   using System  using System Collections Generic   static class Tool       public static string DecToHex int x                string result                while  x    0                        if   x   16   lt  10                  result   x   16   result              else                               string temp                        switch  x   16                                        case 10  temp    A   break                      case 11  temp    B   break                      case 12  temp    C   break                      case 13  temp    D   break                      case 14  temp    E   break                      case 15  temp    F   break                                     result   temp   result                             x    16                     return result             public static int HexToDec string x                int result   0          int count   x Length - 1          for  int i   0  i  lt  x Length  i                          int temp   0              switch  x i                                 case  A   temp   10  break                  case  B   temp   11  break                  case  C   temp   12  break                  case  D   temp   13  break                  case  E   temp   14  break                  case  F   temp   15  break                  default  temp   -48    int x i   break     -48 because of ASCII                            result    temp    int  Math Pow 16  count                count--                     return result           class Program       static void Main string   args                Console Write  Enter Decimal value              int decNum   int Parse Console ReadLine              Console WriteLine  Dec  0  is hex  1    decNum  Tool DecToHex decNum             Console Write   nEnter Hexadecimal value              string hexNum   Console ReadLine   ToUpper             Console WriteLine  Hex  0  is dec  1    hexNum  Tool HexToDec hexNum             Console ReadKey

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To convert from decimal to hex do     string hexValue   decValue ToString  X      To convert from hex to decimal do either     int decValue   int Parse hexValue  System Globalization NumberStyles HexNumber     or    int decValue   Convert ToInt32 hexValue  16

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It looks like you can say  Convert ToInt64 value  16    to get the decimal from hexdecimal   The other way around is   otherVar ToString  X

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Convert binary to Hex  Convert ToString Convert ToUInt32 binary1  2   16  ToUpper

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class HexToDecimal       static void Main                 while  true                        Console Write  Enter digit number to convert                  int n   int Parse Console ReadLine        set hexadecimal digit number               Console Write  Enter hexadecimal number                  string str   Console ReadLine                str Reverse                 char   ch   str ToCharArray                int   intarray   new int n                decimal decimalval   0               for  int i   ch Length - 1  i  gt   0  i--                                if  ch i      0                       intarray i    0                  if  ch i      1                       intarray i    1                  if  ch i      2                       intarray i    2                  if  ch i      3                       intarray i    3                  if  ch i      4                       intarray i    4                  if  ch i      5                       intarray i    5                  if  ch i      6                       intarray i    6                  if  ch i      7                       intarray i    7                  if  ch i      8                       intarray i    8                  if  ch i      9                       intarray i    9                  if  ch i      A                       intarray i    10                  if  ch i      B                       intarray i    11                  if  ch i      C                       intarray i    12                  if  ch i      D                       intarray i    13                  if  ch i      E                       intarray i    14                  if  ch i      F                       intarray i    15                   decimalval    intarray i     decimal Math Pow 16  ch Length - 1 - i                               Console WriteLine decimalval

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Hex -  decimal   Convert ToInt64 hexValue  16     Decimal -  Hex  string format   0 x    decValue

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If you want maximum performance when doing conversion from hex to decimal number  you can use the approach with pre-populated table of hex-to-decimal values   Here is the code that illustrates that idea  My performance tests showed that it can be 20 -40  faster than Convert ToInt32        class TableConvert           static sbyte   unhex table           -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1          0  1  2  3  4  5  6  7  8  9 -1 -1 -1 -1 -1 -1         -1 10 11 12 13 14 15 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 10 11 12 13 14 15 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1                 public static int Convert string hexNumber                    int decValue   unhex table  byte hexNumber 0              for  int i   1  i  lt  hexNumber Length  i                              decValue    16                decValue    unhex table  byte hexNumber i                          return decValue

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An extension method for converting a byte array into a hex representation  This pads each byte with leading zeros            lt summary gt          Turns the byte array into its Hex representation           lt  summary gt      public static string ToHex this byte   y                StringBuilder sb   new StringBuilder            foreach  byte b in y                        sb Append b ToString  X   PadLeft 2   0  0                       return sb ToString

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This is not really easiest way but this source code enable you to right any types of octal number i e 23 214  23 and 0 512 and so on  Hope this will help you        public string octal to decimal string m value                double i  j  x   0          Int64 main value          int k   0          bool pw   true  ch          int position pt   m value IndexOf               if  position pt    -1                        main value   Convert ToInt64 m value               ch   false                    else                       main value   Convert ToInt64 m value Remove position pt  m value Length - position pt                ch   true                     while  k  lt   1                        do                               i   main value   10                                            Return Remainder                 i   i   Convert ToDouble Math Pow 8  x                         calculate power                 if  pw                      x                    else                     x--                  o to d   o to d   i                                            Saving Required calculated value in main variable                 main value   main value   10                                   Dividing the main value                            while  main value  gt   1               if  ch                                k                    main value   Convert ToInt64 Reversestring m value Remove 0  position pt   1                               else                 k   2              pw   false              x   -1                    return  Convert ToString o to d

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Hex to Decimal Conversion  Convert ToInt32 number  16     Decimal to Hex Conversion  int Parse number  System Globalization NumberStyles HexNumber    For more details Check this article

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It looks like you can say  Convert ToInt64 value  16    to get the decimal from hexdecimal   The other way around is   otherVar ToString  X

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To convert from decimal to hex do     string hexValue   decValue ToString  X      To convert from hex to decimal do either     int decValue   int Parse hexValue  System Globalization NumberStyles HexNumber     or    int decValue   Convert ToInt32 hexValue  16

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Here is my function   using System  using System Collections Generic  class HexadecimalToDecimal       static Dictionary lt char  int gt  hexdecval   new Dictionary lt char  int gt             0   0             1   1             2   2             3   3             4   4             5   5             6   6             7   7             8   8             9   9             a   10             b   11             c   12             d   13             e   14             f   15               static decimal HexToDec string hex                decimal result   0          hex   hex ToLower             for  int i   0  i  lt  hex Length  i                          char valAt   hex hex Length - 1 - i               result    hexdecval valAt     int Math Pow 16  i                      return result             static void Main                  Console WriteLine  Enter Hexadecimal value            string hex   Console ReadLine   Trim               string hex    29A           Console WriteLine  Hex  0  is dec  1    hex  HexToDec hex             Console ReadKey

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From Geekpedia      Store integer 182 int decValue   182      Convert integer 182 as a hex in a string variable string hexValue   decValue ToString  X        Convert the hex string back to the number int decAgain   int Parse hexValue  System Globalization NumberStyles HexNumber

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Hex -  decimal   Convert ToInt64 hexValue  16     Decimal -  Hex  string format   0 x    decValue

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Here is my function   using System  using System Collections Generic  class HexadecimalToDecimal       static Dictionary lt char  int gt  hexdecval   new Dictionary lt char  int gt             0   0             1   1             2   2             3   3             4   4             5   5             6   6             7   7             8   8             9   9             a   10             b   11             c   12             d   13             e   14             f   15               static decimal HexToDec string hex                decimal result   0          hex   hex ToLower             for  int i   0  i  lt  hex Length  i                          char valAt   hex hex Length - 1 - i               result    hexdecval valAt     int Math Pow 16  i                      return result             static void Main                  Console WriteLine  Enter Hexadecimal value            string hex   Console ReadLine   Trim               string hex    29A           Console WriteLine  Hex  0  is dec  1    hex  HexToDec hex             Console ReadKey

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This is not really easiest way but this source code enable you to right any types of octal number i e 23 214  23 and 0 512 and so on  Hope this will help you        public string octal to decimal string m value                double i  j  x   0          Int64 main value          int k   0          bool pw   true  ch          int position pt   m value IndexOf               if  position pt    -1                        main value   Convert ToInt64 m value               ch   false                    else                       main value   Convert ToInt64 m value Remove position pt  m value Length - position pt                ch   true                     while  k  lt   1                        do                               i   main value   10                                            Return Remainder                 i   i   Convert ToDouble Math Pow 8  x                         calculate power                 if  pw                      x                    else                     x--                  o to d   o to d   i                                            Saving Required calculated value in main variable                 main value   main value   10                                   Dividing the main value                            while  main value  gt   1               if  ch                                k                    main value   Convert ToInt64 Reversestring m value Remove 0  position pt   1                               else                 k   2              pw   false              x   -1                    return  Convert ToString o to d

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If you want maximum performance when doing conversion from hex to decimal number  you can use the approach with pre-populated table of hex-to-decimal values   Here is the code that illustrates that idea  My performance tests showed that it can be 20 -40  faster than Convert ToInt32        class TableConvert           static sbyte   unhex table           -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1          0  1  2  3  4  5  6  7  8  9 -1 -1 -1 -1 -1 -1         -1 10 11 12 13 14 15 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 10 11 12 13 14 15 -1 -1 -1 -1 -1 -1 -1 -1 -1         -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1                 public static int Convert string hexNumber                    int decValue   unhex table  byte hexNumber 0              for  int i   1  i  lt  hexNumber Length  i                              decValue    16                decValue    unhex table  byte hexNumber i                          return decValue

[c#] How to convert numbers between hexadecimal and decimal

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