Print bits

print_bits_int_ver2.c

#include <stdint.h>
#include <limits.h>

#define numbits(x)  (sizeof(x) * 8)

#define max_signed_value_of_type(t)                             \
        (INTMAX_MAX >> (numbits(intmax_t) - numbits(t)))

void print_bits(int num)
{
        size_t bits = numbits(num);
        int max = max_signed_value_of_type(num) + 1;
        int i;

        for (i = 0; i < bits; i++) {
                if (i && (i % 8) == 0)
                        printf(" ");
                printf("%u", !!(num & max));
                num = num << 1;
        }

        printf("\n");
}