Getting each individual digit from a whole integer

Question

Let s say I have an integer called  score   that looks like this   int score   1529587    Now what I want to do is get each digit 1  5  2  9  5  8  7 from the score using bitwise operators See below edit note      I m pretty sure this can be done since I ve once used a similar method to extract the red green and blue values from a hexadecimal colour value   How would I do this   Edit It doesn t necessarily have to be bitwise operators  I just thought it d be simpler that way

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I ve made this solution  it-s simple instead read an integer  i read a string  char array in C   then write with a for bucle  the code also write the sum of digits     include lt string h gt   scanf  quot  s quot   n   int total   0   for  int i   0  i lt  strlen n   i         printf  quot  c quot   n i        total     int  n i   -48     printf  quot  d quot   total

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include lt stdio h gt   int main     int num    given integer int reminder  int rev 0    To reverse the given integer int count 1   printf  Enter the integer     scanf   i   amp num      First while loop will reverse the number   while num  0        reminder num 10      rev rev 10 reminder      num  10      Second while loop will give the number from left to right   while rev  0        reminder rev 10      printf  The  d digit is  d n  count  reminder       rev  10      count      to give the number from left to right    return  EXIT SUCCESS

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Agree with previous answers   A little correction  There s a better way to print the decimal digits from left to right  without allocating extra buffer  In addition you may want to display a zero characeter if the score is 0  the loop suggested in the previous answers won t print anythng    This demands an additional pass   int div  for  div   1  div  lt   score  div    10         do       div    10      printf   d n   score   div       score    div    while  score

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You use the modulo operator   while score        printf   d n   score   10       score    10      Note that this will give you the digits in reverse order  i e  least significant digit first   If you want the most significant digit first  you ll have to store the digits in an array  then read them out in reverse order

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Usually  this problem resolve with using the modulo of a number in a loop or convert a number to a string  For convert a number to a string  you may can use the function itoa  so considering the variant with the modulo of a number in a loop     Content of a file get digits c    cat get digits c    include  lt stdio h gt   include  lt stdlib h gt   include  lt math h gt       return a length of integer unsigned long int get number count digits long int number       get digits from an integer number into an array int number get digits long int number  int   digits  unsigned int  len       for demo features void demo number get digits long int number     int main         demo number get digits -9999999999999       demo number get digits -10000000000       demo number get digits -1000       demo number get digits -9       demo number get digits 0       demo number get digits 9       demo number get digits 1000       demo number get digits 10000000000       demo number get digits 9999999999999       return EXIT SUCCESS      unsigned long int get number count digits long int number        if  number  lt  0          number   llabs number       else if  number    0          return 1       if  number  lt  999999999999997          return floor log10 number     1       unsigned long int count   0      while  number  gt  0              count          number    10            return count      int number get digits long int number  int   digits  unsigned int  len        number   labs number           termination count digits and size of a array as well as      len   get number count digits number         digits   realloc  digits   len   sizeof int            fill up the array     unsigned int index   0      while  number  gt  0              digits  index     int  number   10           number    10            index                reverse the array     unsigned long int i   0  half len     len   2       int swap      while  i  lt  half len            swap     digits  i             digits  i      digits   len - i - 1             digits   len - i - 1    swap             i             return 0      void demo number get digits long int number        int  digits      unsigned int len       digits   malloc sizeof int         number get digits number   amp digits   amp len        printf   ld -- gt      number       for  unsigned int i   0  i  lt  len    i            if  i    len - 1              printf   d   digits i            else             printf   d     digits i              printf    n         free digits         Demo with the GNU GCC     Downloads temp  cc -Wall -Wextra -std c11 -o run get digits c -lm    Downloads temp    run -9999999999999 -- gt   9  9  9  9  9  9  9  9  9  9  9  9  9  -10000000000 -- gt   1  0  0  0  0  0  0  0  0  0  0  -1000 -- gt   1  0  0  0  -9 -- gt   9  0 -- gt   0  9 -- gt   9  1000 -- gt   1  0  0  0  10000000000 -- gt   1  0  0  0  0  0  0  0  0  0  0  9999999999999 -- gt   9  9  9  9  9  9  9  9  9  9  9  9  9    Demo with the LLVM Clang     Downloads temp  rm run    Downloads temp  clang -std c11 -Wall -Wextra get digits c -o run -lm setivolkylany   Downloads temp    run -9999999999999 -- gt   9  9  9  9  9  9  9  9  9  9  9  9  9  -10000000000 -- gt   1  0  0  0  0  0  0  0  0  0  0  -1000 -- gt   1  0  0  0  -9 -- gt   9  0 -- gt   0  9 -- gt   9  1000 -- gt   1  0  0  0  10000000000 -- gt   1  0  0  0  0  0  0  0  0  0  0  9999999999999 -- gt   9  9  9  9  9  9  9  9  9  9  9  9  9      Testing environment     Downloads temp  cc --version   head -n 1 cc  Debian 4 9 2-10  4 9 2    Downloads temp  clang --version Debian clang version 3 5 0-10  tags RELEASE 350 final   based on LLVM 3 5 0  Target  x86 64-pc-linux-gnu Thread model  posix

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RGB values fall nicely on bit boundaries  decimal digits don t  I don t think there s an easy way to do this using bitwise operators at all  You d need to use decimal operators like modulo 10    10

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Don t reinvent the wheel  C has sprintf for a reason  Since your variable is called score  I m guessing this is for a game where you re planning to use the individual digits of the score to display the numeral glyphs as images  In this case  sprintf has convenient format modifiers that will let you zero-pad  space-pad  etc  the score to a fixed width  which you may want to use

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this can be easily understandable for beginners      int score 12344534  int div  for  div   1  div  lt   score  div    10         for  div   1  div  lt   score  div    10   for loop with semicolon or empty body is same   while score gt 0        div    10      printf   d n enter code here    score   div       score    div

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This solution gives correct results over the entire range  0 UINT MAX  without requiring digits to be buffered     It also works for wider types or signed types  with positive values  with appropriate type changes   This kind of approach is particularly useful on tiny environments  e g  Arduino bootloader  because it doesn t end up pulling in all the printf   bloat  when printf   isn t used for demo output  and uses very little RAM   You can get a look at value just by blinking a single led      include  lt limits h gt   include  lt stdio h gt   int main  void      unsigned int score   42       Works for score in  0  UINT MAX     printf   score via printf       u n   score        For validation    printf   score digit by digit        unsigned int div   1    unsigned int digit count   1    while   div  lt   score   10         digit count        div    10        while   digit count  gt  0         printf    d   score   div       score    div      div    10      digit count--        printf    n       return 0

[c] Getting each individual digit from a whole integer

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