#include <stdio.h>
int SumEvenNumbersInFibonacci(int N) {
if (N < 1)
return 0;
printf("0 1 ");
int currentnumber = 0, nextnumber = 1, nexttemp;
int sum = 0;
for (int i = 0; i < N - 2; i++) {
nexttemp = nextnumber;
nextnumber = currentnumber + nextnumber;
currentnumber = nexttemp;
if (currentnumber % 2 == 0) {
sum += currentnumber;
}
printf("%d ", nextnumber);
}
return sum;
}
int main(void) {
printf("\nsum = %d", SumEvenNumbersInFibonacci(15));
return 0;
}
/*
run:
0 1 1 2 3 5 8 13 21 34 55 89 144 233 377
sum = 188
*/