Check_Even_Fibonacci.java

// Java Program to find even sum of
// fibonacci Series Till number N
import java.io.*;

class geeksforgeeks {

	// Computing the value of first fibonacci series
	// and storing the sum of even indexed numbers
	static int Fib_Even_Sum(int N)
	{
		if (N <= 0)
			return 0;

		int fib[] = new int[2 * N + 1];
		fib[0] = 0;
		fib[1] = 1;

		// Initializing the sum
		int s = 0;

		// Adding remaining numbers
		for (int j = 2; j <= 2 * N; j++) {
			fib[j] = fib[j - 1] + fib[j - 2];

			// Only considering even indexes
			if (j % 2 == 0)
				s += fib[j];
		}

		return s;
	}

	// The Driver code
	public static void main(String[] args)
	{
		int N = 11;

		// Prints the sum of even-indexed numbers
		System.out.println(
			"Even sum of fibonacci series till number " + N
			+ " is: " + +Fib_Even_Sum(N));
	}
}