Question

How to find the sum of the even valued in fibonacci sequence with C#

Answer 1

using System;

class Program
{
    static int SumEvenNumbersInFibonacci(int n) {
        if (n < 1) {
            return 0;
        }

        Console.Write("0 1 ");

        int currentNumber = 0, nextNumber = 1, temp;
        int sum = 0;

        for (int i = 0; i < n - 2; i++) {
            temp = nextNumber;
            nextNumber = currentNumber + nextNumber;
            currentNumber = temp;
            Console.Write(nextNumber + " ");

            if (nextNumber % 2 == 0)
                sum += nextNumber;
        }

        return sum;
    }

    static void Main()
    {
        int sum = SumEvenNumbersInFibonacci(15);
        
        Console.WriteLine("\nSum = " + sum);
    }
}

   
   
/*
run:

0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 
Sum = 188
   
*/

 

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