An implementation of fizzbuzz with only one modulo and one comparison per cycle.

fizzbuzz.c

//
//  main.c
//  fizzbuzz
//
//  Created by James McCartney on 1/15/21.
//

#include <stdio.h>

void fizzbuzz(int n)
{
    static const char* format[4] = {"%d\n", "fizz\n", "buzz\n", "fizzbuzz\n"};
    for (int i = 0; i < n; ++i) {
        int j = 0x3 & (0x01241843 >> ((i % 15) << 1));
        printf(format[j], i);
    }
}

int main(int argc, const char * argv[])
{
    fizzbuzz(101);
    return 0;
}