Convert integer to binary in C

Question

How to convert an integer number into its binary representation   I m using this code   String input    8   String output   Convert ToInt32 input  2  ToString      But it throws an exception      Could not find any parsable digits

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Very Simple with no extra code  just input  conversion and output   using System   namespace  01 Decimal to Binary       class DecimalToBinary               static void Main string   args                        Console Write  Decimal                  int decimalNumber   int Parse Console ReadLine                  int remainder              string result   string Empty              while  decimalNumber  gt  0                                remainder   decimalNumber   2                  decimalNumber    2                  result   remainder ToString     result                            Console WriteLine  Binary    0   result

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using System   class Program        static void Main string   args             try                int i    int  Convert ToInt64 args 0                Console WriteLine   n 0  converted to Binary is  1  n   i  ToBinary i               catch Exception e                Console WriteLine   n 0  n   e Message                        public static string ToBinary Int64 Decimal               Declare a few variables we re going to need         Int64 BinaryHolder          char   BinaryArray          string BinaryResult                while  Decimal  gt  0                BinaryHolder   Decimal   2              BinaryResult    BinaryHolder              Decimal   Decimal   2                     BinaryArray   BinaryResult ToCharArray            Array Reverse BinaryArray           BinaryResult   new string BinaryArray            return BinaryResult

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I know this answer would look similar to most of the answers already here  but I noticed just about none of them uses a for-loop  This code works  and can be considered simple  in the sense it will work without any special functions  like a ToString   with parameters  and is not too long as well  Maybe some prefer for-loops instead of just while-loop  this may be suitable for them   public static string ByteConvert  int num        int   p   new int 8       string pa           for  int ii   0  ii lt   7 ii   ii  1                p 7-ii    num 2          num   num 2            for  int ii   0 ii  lt   7  ii   ii   1                pa    p ii  ToString              return pa

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Another alternative but also inline solution using Enumerable and LINQ is    int number   25   string binary   Enumerable Range 0   int  Math Log number  2    1  Aggregate string Empty   collected  bitshifts    gt    number  gt  gt  bitshifts   amp  1    collected

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Your example has an integer expressed as a string  Let s say your integer was actually an integer  and you want to take the integer and convert it to a binary string    int value   8  string binary   Convert ToString value  2     Which returns 1000

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Convert ToInt32 string  base  does not do base conversion into your base  It assumes that the string contains a valid number in the indicated base  and converts to base 10   So you re getting an error because  8  is not a valid digit in base 2   String str    1111   String Ans   Convert ToInt32 str  2  ToString      Will show 15  1111 base 2   15 base 10   String str    f000   String Ans   Convert ToInt32 str  16  ToString      Will show 61440

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primitive way   public string ToBinary int n        if  n  lt  2  return n ToString         var divisor   n   2      var remainder   n   2       return ToBinary divisor    remainder

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http   zamirsblog blogspot com 2011 10 convert-decimal-to-binary-in-c html      public string DecimalToBinary string data                string result   string Empty          int rem   0          try                       if   IsNumeric data                   error    Invalid Value - This is not a numeric value               else                               int num   int Parse data                   while  num  gt  0                                        rem   num   2                      num   num   2                      result   rem ToString     result                                                    catch  Exception ex                        error   ex Message                    return result

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Convert from any classic base to any base in C   String number    100   int fromBase   16  int toBase   10   String result   Convert ToString Convert ToInt32 number  fromBase   toBase       result     256    Supported bases are 2  8  10 and 16

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class Program       static void Main string   args                var  decimal   42          var binaryVal   ToBinary  decimal  2            var binary    101010           var decimalVal   ToDecimal binary  2            Console WriteLine  Binary value of decimal  0  is   1      decimal  binaryVal           Console WriteLine  Decimal value of binary   0   is  1    binary  decimalVal           Console WriteLine              decimal   6          binaryVal   ToBinary  decimal  3            binary    20           decimalVal   ToDecimal binary  3            Console WriteLine  Base3 value of decimal  0  is   1      decimal  binaryVal           Console WriteLine  Decimal value of base3   0   is  1    binary  decimalVal           Console WriteLine               decimal   47          binaryVal   ToBinary  decimal  4            binary    233           decimalVal   ToDecimal binary  4            Console WriteLine  Base4 value of decimal  0  is   1      decimal  binaryVal           Console WriteLine  Decimal value of base4   0   is  1    binary  decimalVal           Console WriteLine              decimal   99          binaryVal   ToBinary  decimal  5            binary    344           decimalVal   ToDecimal binary  5            Console WriteLine  Base5 value of decimal  0  is   1      decimal  binaryVal           Console WriteLine  Decimal value of base5   0   is  1    binary  decimalVal           Console WriteLine             Console WriteLine  And so forth   excluding after base 10  decimal  though               Console WriteLine               decimal   16          binaryVal   ToBinary  decimal  11            binary    b           decimalVal   ToDecimal binary  11            Console WriteLine  Hexidecimal value of decimal  0  is   1      decimal  binaryVal           Console WriteLine  Decimal value of Hexidecimal   0   is  1    binary  decimalVal           Console WriteLine            Console WriteLine  Uh oh   this aint right        but let s cheat  P            Console WriteLine              decimal   11          binaryVal   Convert ToString  decimal  16            binary    b           decimalVal   Convert ToInt32 binary  16            Console WriteLine  Hexidecimal value of decimal  0  is   1      decimal  binaryVal           Console WriteLine  Decimal value of Hexidecimal   0   is  1    binary  decimalVal            Console ReadLine                static string ToBinary decimal number  int  base                var round   0          var reverseBinary   string Empty           while  number  gt  0                        var remainder   number    base              reverseBinary    remainder               round    int  number    base               number   round                     var binaryArray   reverseBinary ToCharArray            Array Reverse binaryArray            var binary   new string binaryArray           return binary             static double ToDecimal string binary  int  base                var val   0d           if   binary All char IsNumber               return 0d           for  int i   0  i  lt  binary Length  i                          var  char   Convert ToDouble binary i  ToString                  var pow    binary Length - 1  - i              val    Math Pow  base  pow     char                     return val            Learning sources    Everything you need to know about binary  including algorithm to convert decimal to binary

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I use this function     public static string ToBinary long number                string digit   Convert ToString number   2           if  number  gt   2                        long remaining   number   2              string remainingString   ToBinary remaining               return remainingString   digit                    return digit

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class Program      static void Main string   args          try        int i    int Convert ToInt64 args 0             Console WriteLine   n 0  converted to Binary is  1  n  i ToBinary i            catch Exception e             Console WriteLine   n 0  n  e Message                   end Main           public static string ToBinary Int64 Decimal                           Declare a few variables we re going to need             Int64 BinaryHolder              char   BinaryArray              string BinaryResult                    while  Decimal  gt  0                                BinaryHolder   Decimal   2                  BinaryResult    BinaryHolder                  Decimal   Decimal   2                                The algoritm gives us the binary number in reverse order  mirrored                 We store it in an array so that we can reverse it back to normal             BinaryArray   BinaryResult ToCharArray                Array Reverse BinaryArray               BinaryResult   new string BinaryArray                return BinaryResult                 end class Program

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This was a interesting read i was looking for a quick copy paste  I knew i had done this before long ago with bitmath differently  Here was my take on it     i had this as a extension method in a static class  this int inValue    public static string ToBinaryString int inValue        string result    quot  quot       for  int bitIndexToTest   0  bitIndexToTest  lt  32  bitIndexToTest            result      inValue  amp   1  lt  lt   bitIndexToTest     gt  0     1     0       return result     You could stick spacing in there with a bit of modulos in the loop             little bit of spacing         if    bitIndexToTest   1    spaceEvery     0              result          You could probably use or pass in a stringbuilder and append or index directly to avoid deallocations and also get around the use of      this way

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I came across this problem in a coding challenge where you have to convert 32 digit decimal to binary and find the possible combination of the substring    using System  using System Collections Generic  using System Globalization  using System Numerics  using System IO  using System Linq  using System Text  using System Threading Tasks   namespace ConsoleApp2       class Program                public static void Main                         int numberofinputs   int Parse Console ReadLine                 List lt BigInteger gt  inputdecimal   new List lt BigInteger gt                 List lt string gt  outputBinary   new List lt string gt                   for  int i   0  i  lt  numberofinputs  i                                  inputdecimal Add BigInteger Parse Console ReadLine    CultureInfo InvariantCulture                                processing begins               foreach  var n in inputdecimal                                string binary    binaryconveter n                    subString binary  binary Length                              foreach  var item in outputBinary                                Console WriteLine item                              string binaryconveter BigInteger n                                int i                  StringBuilder output   new StringBuilder                     for  i   0  n  gt  0  i                                          output   output Append n   2                       n   n   2                                     return output ToString                               void subString string str  int n                                int zeroodds   0                  int oneodds   0                   for  int len   1  len  lt   n  len                                           for  int i   0  i  lt   n - len  i                                                  int j   i   len - 1                           string substring                               for  int k   i  k  lt   j  k                                                          substring   String Concat substring  str k                                                       var resultofstringanalysis   stringanalysis substring                           if  resultofstringanalysis Equals  both are odd                                                            zeroodds                                oneodds                                                    else if  resultofstringanalysis Equals  zeroes are odd                                                            zeroodds                                                    else if  resultofstringanalysis Equals  ones are odd                                                            oneodds                                                                                     string outputtest   String Concat zeroodds ToString         oneodds ToString                     outputBinary Add outputtest                              string stringanalysis string str                                int n   str Length                   int nofZeros   0                  int nofOnes   0                   for  int i   0  i  lt  n  i                                          if  str i      0                                                   nofZeros                                            if  str i      1                                                   nofOnes                                                           if   nofZeros    0  amp  amp  nofZeros   2    0   amp  amp   nofOnes    0  amp  amp  nofOnes   2    0                                         return  both are odd                                     else if  nofZeros    0  amp  amp  nofZeros   2    0                                        return  zeroes are odd                                     else if  nofOnes    0  amp  amp  nofOnes   2    0                                        return  ones are odd                                     else                                       return  nothing                                                Console ReadKey

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int x 550      string s          string y           while  x gt 0                 s    x 2          x x 2              Console WriteLine Reverse s       public static string Reverse  string s         char   charArray   s ToCharArray        Array Reverse  charArray        return new string  charArray

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BCL provided Convert ToString n  2  is good  but in case you need an alternate implementation which is few ticks faster than BCL provided one    Following custom implementation works for all integers -ve and  ve   Original source taken from https   davidsekar com algorithms csharp-program-to-convert-decimal-to-binary  static string ToBinary int n        int j   0      char   output   new char 32        if  n    0          output j       0       else               int checkBit   1  lt  lt  30          bool skipInitialZeros   true             Check the sign bit separately  as 1 lt  lt 31 will cause             ve integer overflow         if   n  amp  int MinValue     int MinValue                        output j       1               skipInitialZeros   false                     for  int i   0  i  lt  31  i    checkBit  gt  gt   1                        if   n  amp  checkBit     0                                if  skipInitialZeros                      continue                  else                     output j       0                             else                               skipInitialZeros   false                  output j       1                                      return new string output  0  j       Above code is my implementation  So  I m eager to hear any feedback

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static void Main string   args                     Console WriteLine  Enter number for converting to binary numerical system             int num   Convert ToInt32 Console ReadLine             int   arr   new int 16              for positive integers         if  num  gt  0                         for  int i   0  i  lt  16  i                                  if  num  gt  0                                        if   num   2     0                                                num   num   2                          arr 16 -  i   1     0                                            else if   num   2     0                                                num   num   2                          arr 16 -  i   1     1                                                                    for  int y   0  y  lt  16  y                                  Console Write arr y                              Console ReadLine                         for negative integers         else if  num  lt  0                        num    num   1    -1               for  int i   0  i  lt  16  i                                  if  num  gt  0                                        if   num   2     0                                                num   num   2                          arr 16 -  i   1     0                                            else if   num   2     0                                                num   num   2                          arr 16 -  i   1     1                                                                     for  int y   0  y  lt  16  y                                  if  arr y     0                                        arr y    0                                    else                                       arr y    1                                    Console Write arr y                              Console ReadLine

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This might be helpful if you want a concise function that you can call from your main method  inside your class  You may still need to call int Parse toBinary someint   if you require a number instead of a string but I find this method work pretty well  Additionally  this can be adjusted to use a for loop instead of a do-while if you d prefer       public static string toBinary int base10                string binary               do               binary    base10   2    binary              base10    2                    while  base10  gt  0            return binary          toBinary 10  returns the string  1010

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static void convertToBinary int n                Stack lt int gt  stack   new Stack lt int gt             stack Push n              step 1   Push the element on the stack         while  n  gt  1                        n   n   2              stack Push n                         step 2   Pop the element and print the value         foreach var val in stack                        Console Write val   2

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This function will convert integer to binary in C    public static string ToBinary int N        int d   N      int q   -1      int r   -1       string binNumber   string Empty      while  q    1                r   d   2          q   d   2          d   q          binNumber   r ToString     binNumber            binNumber   q ToString     binNumber      return binNumber

[c#] Convert integer to binary in C#

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