Convert int to a bit array in NET

Question

How can I convert an int to a bit array   If I e g  have an int with the value 3 I want an array  that has the length 8 and that looks like this   0 0 0 0 0 0 1 1   Each of these numbers are in a separate slot in the array that have the size 8

User · Answer

int value   3   var array   Convert ToString value  2  PadLeft 8   0   ToArray

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I just ran into an instance where     int val   2097152  var arr   Convert ToString val  2  ToArray    var myVal   arr 21        did not produce the results I was looking for   In  myVal  above  the value stored in the array in position 21 was  0    It should have been a  1    I m not sure why I received an inaccurate value for this and it baffled me until I found another way in C  to convert an INT to a bit array   int val   2097152  var arr   new BitArray BitConverter GetBytes val    var myVal   arr 21     This produced the result  true  as a boolean value for  myVal      I realize this may not be the most efficient way to obtain this value  but it was very straight forward  simple  and readable

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public static bool   Convert int   input  int length                var ret   new bool length           var siz   sizeof int    8          var pow   0          var cur   0           for  var a   0  a  lt  input Length  amp  amp  cur  lt  length    a                        var inp   input a                pow   1               if  inp  gt  0                                for  var i   0  i  lt  siz  amp  amp  cur  lt  length    i                                        ret cur       inp  amp  pow     pow                       pow    2                                              else                               for  var i   0  i  lt  siz  amp  amp  cur  lt  length    i                                        ret cur       inp  amp  pow     pow                       pow    2                                                     return ret

User · Answer

To convert the int  x   int x   3    One way  by manipulation on the int     string s   Convert ToString x  2     Convert to binary in a string  int   bits  s PadLeft 8   0      Add 0 s from left               Select c   gt  int Parse c ToString        convert each char to int               ToArray       Convert IEnumerable from select to Array   Alternatively  by using the BitArray class-  BitArray b   new BitArray new byte     x     int   bits   b Cast lt bool gt    Select bit   gt  bit   1   0  ToArray

User · Answer

Use the BitArray class   int value   3  BitArray b   new BitArray new int     value       If you want to get an array for the bits  you can use the BitArray CopyTo method with a bool   array   bool   bits   new bool b Count   b CopyTo bits  0     Note that the bits will be stored from least significant to most significant  so you may wish to use Array Reverse   And finally  if you want get 0s and 1s for each bit instead of booleans  I m using a byte to store each bit  less wasteful than an int    byte   bitValues   bits Select bit   gt   byte  bit   1   0   ToArray

User · Answer

I would achieve it in a one-liner as shown below   using System  using System Collections   namespace stackoverflowQuestions       class Program               static void Main string   args                              get bit Array for number 20             var myBitArray   new BitArray BitConverter GetBytes 20                        Please note that every element of a BitArray is stored as bool as shown in below snapshot     So below code works   if  myBitArray 0     false          this code block will execute     but below code doesn t compile at all   if  myBitArray 0     0          some code

User · Answer

Use Convert ToString  value  2   so in your case  string binValue   Convert ToString  3  2

User · Answer

To convert your integer input to an array of bool of any size  just use LINQ   bool   ToBits int input  int numberOfBits        return Enumerable Range 0  numberOfBits       Select bitIndex   gt  1  lt  lt  bitIndex       Select bitMask   gt   input  amp  bitMask     bitMask       ToArray        So to convert an integer to a bool array of up to 32 bits  simply use it like so   bool   bits   ToBits 65  8      true  false  false  false  false  false  true  false   You may wish to reverse the array depending on your needs   Array Reverse bits

[c#] Convert int to a bit array in .NET

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