Python convert decimal to hex

Question

I have a function here that converts decimal to hex but it prints it in reverse order  How would I fix it   def ChangeHex n       if  n  lt  0           print 0      elif  n lt  1           print n      else          x   n 16          if  x  lt  10               print x            if  x    10               print  A            if  x    11               print  B            if  x    12               print  C            if  x    13               print  D            if  x    14               print  E            if  x    15               print   F            ChangeHex  n   16

User · Answer

This isn t exactly what you asked for but you can use the  hex  function in python    gt  gt  gt  hex 15   0xf

User · Answer

def main        result   int input  Enter a whole  positive  number to be converted to hexadecimal          hexadecimal          while result    0          remainder   changeDigit result   16          hexadecimal   str remainder    hexadecimal         result   int result   16      print hexadecimal   def changeDigit digit       decimal        10   11   12   13   14   15       hexadecimal     A    B    C    D    E    F       for counter in range 7           if digit    decimal counter - 1               digit   hexadecimal counter - 1      return digit  main     This is the densest I could make for converting decimal to hexadecimal   NOTE  This is in Python version 3 5 1

User · Answer

In order to put the number in the correct order i modified your code to have a variable  s  for the output  This allows you to put the characters in the correct order   s    def ChangeHex n       if  n  lt  0           print 0      elif  n lt  1           print n      else          x   n 16          if  x  lt  10               s str x  s           if  x    10               s  A  s          if  x    11               s  B  s          if  x    12               s  C  s          if  x    13               s  D  s          if  x    14               s  E  s          if  x    15               s  F  s          ChangeHex  n   16             NOTE  This was done in python 3 7 4 so it may not work for you

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If you want to code this yourself instead of using the built-in function hex    you can simply do the recursive call before you print the current digit   def ChangeHex n       if  n  lt  0           print 0      elif  n lt  1           print n      else          ChangeHex  n   16           x   n 16          if  x  lt  10               print x            if  x    10               print  A            if  x    11               print  B            if  x    12               print  C            if  x    13               print  D            if  x    14               print  E            if  x    15               print   F

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non recursive approach to convert decimal to hex  def to hex dec        hex str          hex digits     0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F       rem   dec   16      while dec  gt   rem          remainder   dec   16         quotient   dec   16         if quotient    0              hex str    hex digits remainder          else              hex str    str remainder          dec   quotient      return hex str   -1    reverse the string

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To get a pure hex value this might be useful  It s based on Joe s answer   def gethex decimal       return hex decimal  2

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hex map    0 0  1 1  2 2  3 3  4 4  5 5  6 6  7 7  8 8  9 9  10  A   11  B   12  C   13  D   14  E   15  F    def to hex n       result          if n    0          return  0      while n    0          result    str hex map  n   16            n   n    16     return  0x  result   -1

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Instead of printing everything in the function  you could just allow it to return the value in hex  and do whatever you want with it   def ChangeHex n       x    n   16      c          if  x  lt  10           c   x     if  x    10           c    A      if  x    11           c    B      if  x    12           c    C      if  x    13           c    D      if  x    14           c    E      if  x    15           c    F       if  n - x    0           return ChangeHex n   16    str c      else          return str c   print ChangeHex 52     There are probably more elegant ways of parsing the alphabetic components of the hex  instead of just using conditionals

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dec   int input  Enter a number below 256      hex1   dec    16  if hex1  gt   10      hex1   hex dec   hex2   dec   16 if hex2  gt   10      hex2   hex hex2   print hex1 strip  0x      Works well

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I think this solution is elegant  def toHex dec       digits    quot 0123456789ABCDEF quot      x    dec   16      rest   dec    16     if  rest    0           return digits x      return toHex rest    digits x   numbers    0  11  16  32  33  41  45  678  574893  print  toHex x  for x in numbers  print  hex x  for x in numbers   This output    0    B    10    20    21    29    2D    2A6    8C5AD     0x0    0xb    0x10    0x20    0x21    0x29    0x2d    0x2a6    0x8c5ad

User · Answer

This is the best way I use it  hex 53350632996854  lstrip  0x   rstrip  L     lstrip helps remove  0x  from the left     rstrip helps remove  L  from the right    L represents a long number   Example    gt  gt  gt  decimal   53350632996854  gt  gt  gt  hexadecimal   hex decimal  lstrip  0x    gt  gt  gt  print hexadecimal  3085a9873ff6   if you need it Upper Case  Can use  upper function   For Example   decimal   53350632996854 hexadecimal   hex decimal  lstrip  0x   upper   print hexadecimal  3085A9873FF6

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If without  0x  prefix     0 x   format int dec     else use built-in hex   funtion

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Python s string format method can take a format spec   From decimal to binary    0 b   format 154   10011010    From decimal to octal    0 o   format 154   232    From decimal to hexadecimal    0 x   format 154   9a    Format spec docs for Python 2  Format spec docs for Python 3

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If you need even numbers of chars to be returned  you can use   def int to hex nr     h   format int nr    x     return  0    h if len h    2 else h   Example  int to hex 10     returns   0a    and   int to hex 1000     returns   03e8

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I use    0x X    n   where n is the decimal number to convert

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What about this   hex dec  split  x   -1    Example    gt  gt  gt  d   30  gt  gt  gt  hex d  split  x   -1   1e     Rich  By using -1 in the result of split    this would work even if split returned a list of 1 element

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It is good to write your own functions for conversions between numeral systems to learn something  For  real  code I would recommend to use build in conversion function from Python like bin x   hex x   int x   Some examples can be found here

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Apart from using the hex   inbuilt function  this works well   letters    0 1 2 3 4 5 6 7 8 9  A   B   C   D   E   F   decimal number   int input  Enter a number to convert to hex      print str letters decimal number  16   str letters decimal number 16      However this only works for converting decimal numbers up to 255  to give a two diget hex number

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n   eval input  Enter the number     def ChangeHex n       if  n  lt  0           print 0      elif  n lt  1           print n       else          ChangeHex  n   16           x   n 16          if  x  lt  10               print x            if  x    10               print  A            if  x    11               print  B            if  x    12               print  C            if  x    13               print  D            if  x    14               print  E            if  x    15               print   F

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A version using iteration   def toHex decimal       hex str          digits    0123456789ABCDEF      if decimal    0         return  0       while decimal    0          hex str    digits decimal   16          decimal   decimal    16      return hex str   -1    reverse the string  numbers    0  16  20  45  255  456  789  1024  print  toHex x  for x in numbers   print  hex x  for x in numbers

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I recently made this python program to convert Decimal to Hexadecimal  please check this out  This is my first Answer in stack overflow   decimal   int input  quot Enter the Decimal no that you want to convert to Hexadecimal    quot    intact   decimal hexadecimal      dictionary    1  1  2  2  3  3  4  4  5  5  6  6  7  7  8  8  9  9  10  A  11  B  12  C  13  D  14  E  15  F    while decimal  0       c   decimal 16      hexadecimal    dictionary c    hexadecimal      decimal   int decimal 16   print f quot  intact  is  hexadecimal  in Hexadecimal quot    When you Execute this code this will give output as  Enter the Decimal no that you want to convert to Hexadecimal    2766 2766 is ACE in Hexadecimal

User · Answer

def tohex dec       x    dec 16      igits    0123456789ABCDEF      digits   list igits      rest   int dec 16      if  rest    0           return digits x      return tohex rest    digits x   numbers    0 16 32 48 46 2 55 887  hex      0x  tohex i  for i in numbers  print hex

[python] Python convert decimal to hex

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