bit_print.c

   1 /*
   2
   3 Prints out the bits contained in an integer value.
   4
   5 */
   6
   7 #include <stdio.h>
   8 #include <limits.h>
   9
  10 void bit_print(int a)
  11 {
  12         int i;
  13         int n = sizeof(int) * CHAR_BIT;  /* find size of ints for this macine */
  14         int mask = 1 << (n - 1); /* set mask to 1000000...000 */
  15
  16         for(i = 1; i <= n; ++i)
  17         {
  18                 putchar(((a & mask) == 0) ? '0' : '1');
  19                 a <<= 1; /* shift over by one bit */
  20                 if(i % CHAR_BIT == 0 && i < n)
  21                         putchar(' ');
  22         }
  23         putchar('\n');
  24
  25 }
  26
  27 int main()
  28 {
  29         int number;
  30
  31         for(number = 0; number <= 16; ++number)
  32         {
  33                 bit_print(number);
  34         }
  35
  36         return 0;
  37 }