Well, there is this approach: #include <stdio.h> #include <stdint.h> #define FIZZ(x) (x & 0x0924) #define BUZZ(x) (x & 0x0

Well, there is this approach: #include <stdio.h> #include <stdint.h> #define FIZZ(x) (x & 0x0924) #define BUZZ(x) (x & 0x0210) #define FIZZBUZZ(x) (x & 0x4000) #define NONE(x) (x & 0x34cb) void fizzbuzz(size_t n_max) { uint32_t x = 1; for (size_t i = 1; i <= n_max; i++) { if (FIZZ(x)) printf("fizz\n"); if (BUZZ(x)) printf("buzz\n"); if (FIZZBUZZ(x)) printf("fizzbuzz\n"); if (NONE(x)) printf("%d\n", i); x <<= 1; x |= (x >> 15); } } int main(int argc, char **argv) { fizzbuzz(100); } It's less costly than integer division, and I'm not sure it's what you had in mind. The output here still duplicates the strings.