How to convert binary string value to decimal

Question

How to convert a binary String such as  String c    110010      as binary   to the value in decimal in Java   expected result in the example is 50

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public static Long binToDec String bin    long dec   0L      long pow   1L      for  int i    bin length   - 1   i  gt   0  i--            char c   bin charAt i           dec   dec    Long parseLong c         pow           pow   pow   2            return dec      or   long num   Long parseLong  101110111  2

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public static void convertStringToDecimal String binary        int decimal 0      int power 0      while binary length   gt 0                int temp   Integer parseInt binary charAt  binary length   -1               decimal  temp Math pow 2  power             binary binary substring 0 binary length  -1             System out println decimal

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public static int integerfrmbinary String str       double j 0      for int i 0 i lt str length   i             if str charAt i     1             j j  Math pow 2 str length  -1-i                     return  int  j      This piece of code I have written manually  You can also use parseInt as mentioned above   This function will give decimal value corresponding to the binary string

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According to this    we can write this help function       public static int convertBinaryToDecimal String str            int result   0          for  int i   0  i  lt  str length    i                  int value   Character getNumericValue str charAt i                result   result   2   value                    return result

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int base2 String bits        int ans   0      for  int i   bits length   - 1  f   1  i  gt   0  i--          ans    f    bits charAt i  -  0          f  lt  lt   1            return ans

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import java util    public class BinaryToDecimal     public static void main           Scanner sc new Scanner System in       System out println  enter the binary number        double s sc nextDouble        int c 0      long s1 0      while s gt 0                s1 s1  long  Math pow 2 c   long  s 10            s  long s 10          c              System out println  The respective decimal number is     s1

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private static int convertBinaryToDecimal String strOfBinary           int flag   1  binary 0          char binaryOne    1           char   charArray   strOfBinary toCharArray            for int i charArray length-1 i gt  0 i--               if charArray i     binaryOne                   binary  flag                            flag  2                    return binary

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int num   Integer parseInt  binaryString  2

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I think you are looking for Integer parseInt   The second argument takes a radix  which in this case is 2   Integer parseInt c  2

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test this  you ll find out that there is a line in the code which contains Scan S    This is used only for stocking data  String   So just try this    PS Don t forget to save the file as bindec  import java io    class Scan               public static String S                  String x      char c      boolean erreur       do                   x                   erreur   false               try                               while  c    char System in read         n                                 if  c      r                                                 x    c                                                                    catch IOException e                                System out print    gt  enter String                       erreur   true                      while erreur        return x        public class  bindec       public static void main  String   args            int b 0          String a          System out println  bin              a   Lire S            int j a length  -1          for int i 0 i lt a length    i                  if a charAt i    1                b    Math pow 2 j                     if a charAt i    0                b  0                    j j-1                System out println  dec    b

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int i   Integer parseInt c  2

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Have to think about the decimal precision  so you must to limit the bitstring length  Anyway  using BigDecimal is a good choice   public BigDecimal bitStringToBigDecimal String bitStr        BigDecimal sum   new BigDecimal  0        BigDecimal base   new BigDecimal 2       BigDecimal temp      for int i 0 i lt bitStr length   i             if bitStr charAt i     1                int exponent  bitStr length  -1-i              temp base pow exponent               sum sum add temp                        return sum

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Test it  import java util Scanner  public class BinaryToDecimal   public static void main String   args         Scanner input   new Scanner System in       int binaryNumber   0      int counter   0      int number   0        System out print  Input binary number          binaryNumber   input nextInt           it s going to stop when the binaryNumber 10 is less than 0       example        binaryNumber   11 10  The result value is 1 when you do the next       operation 1 10   The result value is 0           while binaryNumber    0                  Obtaining the remainder of the division and multiplying it            with the number raised to two            adding it up with the previous result          number      binaryNumber   10     Math pow 2 counter            binaryNumber    10     removing one digit from the binary number            Increasing counter 2 0  2 1  2 2  2 3              counter               System out println  Decimal number       number

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public static void main String   args         java util Scanner scan   new java util Scanner System in       long decimalValue   0       System out println  Please enter a positive binary number  Only 1s and 0s            This reads the input as a String and splits each symbol into        array list     String element   scan nextLine        String   array   element split             This assigns the length to integer arrys based on actual number of        symbols entered     int   numberSplit   new int array length       int position   array length - 1    set beginning position to the end of array        This turns String array into Integer array     for  int i   0  i  lt  array length  i              numberSplit i    Integer parseInt array i                This loop goes from last to first position of an array making       calculation where power of 2 is the current loop instance number     for  int i   0  i  lt  array length  i              if  numberSplit position     1                decimalValue   decimalValue    long  Math pow 2  i                     position--            System out println decimalValue       main null

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Use Integer parseInt  see javadoc   that converts your String to int using base two   int decimalValue   Integer parseInt c  2

[java] How to convert binary string value to decimal

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