Java Problem Set 2

Write a function which calculates the sum of even Fibonacci numbers.

public static void main(String args[]) {
    for(int i=1;i<22;i++)
        System.out.print(sumofEvenFibonacci(i) + " ");
}

public static long sumofEvenFibonacci(int n) {
    // add your code here.
    return sum;
}

prints

0 0 2 2 2 10 10 10 44 44 44 188 188 188 798 798 798 3382 3382 3382 14328

-->
--> [Click for sample solution]

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public static long sumEvenFibonacci(int n) {
  long first = 1, second = 1, sum = 0;
  for (int i = n; i > 2; i -= 3) {
    long c = first + second ;
    sum += c;
    first = second + c;
    second = first + c;
  }
  return sum;
}

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