Problem
https://projecteuler.net/problem=2
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
\[1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...\]By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
Answer: 4613732
Solution
package org.tvarley.euler.solutions;
import org.tvarley.euler.Solution;
public class Solution002 implements Solution {
public String solve() {
int sum = 0;
int fib1 = 1;
int fib2 = 1;
int running = 0;
while( running < 4000000 ) {
if( (running % 2) == 0 ) {
sum += running;
}
running = fib1 + fib2;
fib2 = fib1;
fib1 = running;
}
return Integer.toString(sum);
}
}