Main.java

/*
@author: mc-es

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
*/

public class Main {
	public static void main(String[] args) {
		long limit = 4000000;
		System.out.println(fibonacci(limit));
	}

	public static long fibonacci(long limit) {
		int a = 1;
		int b = 2;
		int result = 0;

		while (b <= limit) {
			if (b % 2 == 0) {
				result += b;
			}
			int temp = a;
			a = b;
			b = temp + b;
		}

		return result;
	}
}