ProjectEuler/c/0001.c

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

int
main(int argc, const char **argv)
{
	uint64_t sum = 0;
	uint64_t i = 0;
	uint64_t mod3 = 0, mod5 = 0;
	uint64_t upper_limit = 1000;

	for ( i = 0; i < upper_limit; ++i ) {
		mod3 = i % 3;
		mod5 = i % 5;
		sum += ( mod3 == 0 && mod5 != 0 ) * i
			+ ( mod5 == 0 && mod3 != 0 ) * i
			+ ( mod5 == 0 && mod3 == 0 ) * i;
	}

	printf("Result = %ld!\n", sum);
	(void) argc; (void) argv;
	return 0;
}