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fizzbuzz.c
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fizzbuzz.c
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#include <stdlib.h>
#include <stdio.h>
#define DEFAULT_UPPER_LIMIT 100
#define FIZZ_DIVISOR 3
#define BUZZ_DIVISOR 5
int main(int argc, char *argv[])
{
long int upper_limit = DEFAULT_UPPER_LIMIT;
char *strtol_endptr;
if (argc > 1) {
int arg_int = strtol(argv[1], &strtol_endptr, 0);
if (strtol_endptr != argv[1]) {
upper_limit = arg_int;
}
}
for (int i = 1; i <= upper_limit; i++) {
int is_fizz = i % FIZZ_DIVISOR == 0;
int is_buzz = i % BUZZ_DIVISOR == 0;
int fizzbuzz_flags = is_fizz | (is_buzz << 1);
switch (fizzbuzz_flags) {
case 0:
printf("%d", i);
break;
case 1:
printf("Fizz");
break;
case 3:
printf("Fizz");
case 2:
printf("Buzz");
break;
default:
dprintf(2, "Illegal value for flags, should be impossible\n");
exit(1);
}
printf("\n");
}
}