A simple FizzBuzz that uses counters instead of division.

simple_fizzbuzz.c

#include <stdio.h>
  
int main() {
    unsigned int fb = 0x0F0305; // 15 for fizzbuzz, 3 for fizz, and 5 for buzz
    for (unsigned int i = 1; i < 101; i++) {
        fb -= 0x010101; // Decrement one from each counter.
        if (fb < 0X010000) {
            fb = 0x0F0305; // Reset all counters to original value;
            printf("fizzbuzz\n");
        } else if ((fb & 0xFFFF) < 0x0100) {
            fb += 0x0300;  // Reset the fizz counter to 3.
            printf("fizz\n");
        } else if (!(fb & 0xFF)) {
            fb += 5; // Reset the buzz counter to 5.
            printf("buzz\n");
        } else { printf("%d\n", i); }
    }
}