By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even - valued terms.

evenFibonacciSum.cpp

/*
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, ...
*/


#include <iostream>

using namespace std;

int main()
{
	int numA = 0;
	int numB = 0;
	int sum = 1;
	int evenSum = 0;
	
	//By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even - valued terms.
	while (numA <= 4000000)
	{
		numA = sum;
		sum = numA + numB;
		numB = numA;

		if (sum % 2 == 0)
			evenSum += sum;
	}
	cout << evenSum << endl;
	return 0;
}