fizz-enterprise-w-numbers.c

#include <stdio.h>
#include <stdint.h>

void main(void)
{
   char num[4];
   const char *lut[] = { num, "Fizz\n", "Buff\n", "FizzBuff\n" };
   for (uint32_t i = 1; i <= 100; ++i) {
      const uint8_t n = !(i % 3) + (2 * !(i % 5));
      snprintf(num, sizeof(num), "%d\n", i);
      printf("%s", lut[n]);
   }
}

fizz-enterprise.c

#include <stdio.h>
#include <stdint.h>

void main(void)
{
   const char *lut[] = { "", "Fizz\n", "Buff\n", "FizzBuff\n" };
   for (uint32_t i = 1; i <= 100; ++i) {
      const uint8_t n = !(i % 3) + (2 * !(i % 5));
      printf("%s", lut[n]);
   }
}