rudimentary bit printer

print_bits.c

#ifndef PRINT_BITS_C
#define PRINT_BITS_C

#include <stdio.h>
#include <limits.h>

extern void print_bits(unsigned bits)
{
  int WIDTH = sizeof(bits) * CHAR_BIT;
  char bit_repr[WIDTH];
  for (int i = 0; i <= WIDTH - 1; i++)
  {
    bit_repr[i] = bits & 0x01;  // Read the last bit by masking it
    bits = bits >> 1;
  }

  for (int i = WIDTH - 1; i >= 0; i--)
  {
    if (i == 0) {
      printf("%i\n", bit_repr[i]);
      break;
    } else if ((i % 3) == 0){ // octal-friendly representation
      printf("%i ", bit_repr[i]);
    } else {
      printf("%i", bit_repr[i]);
    }
  }
}

#endif /* !PRINT_BITS_C */