printBits.c

/*
 * Author: Piotr Likus, SpaceInSoft, 2016
 * License: MIT
 */
 
#include <stdio.h>

// prints unsigned int in binary form
void printBits(unsigned int num)
{
   const int bit_cnt = sizeof(unsigned int) * 8;
   unsigned int mask = (1 << (bit_cnt - 1));

   do
   {
      printf("%u", (num & mask) != 0?1:0);
      mask >>= 1;
   } while (mask > 0);
}

int main()
{
    unsigned int test_value = 0xfa1b1122;

    printf("test value as hex: %08x\n", test_value);
    printf("test value as bits: ");
    printBits(test_value);
    printf("\n");

    return 0;
}