ProjectEuler/c/0002.c

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

int
main(int argc, const char **argv)
{
	uint64_t sum = 2;
	uint64_t t = 0;
	uint64_t fib = 2;
	uint64_t fib_old = 1;
	uint64_t upper_limit = 4000000;

	while ( fib < upper_limit ) {
		t = fib_old;
		fib_old = fib;
		fib += t;
		sum += ( fib < upper_limit ) * (( (fib & 1) == 0 ) * fib);
	}

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