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.

#!/usr/bin/ruby
maxFibNum = 4000000
evenNumberTotal = 0
n1 = 0
n2 = 1
fib = 0
while fib <= maxFibNum
	fib = n1 + n2
	n1 = n2
	n2 = fib
	if fib % 2 == 0
		evenNumberTotal += fib
	end
end
puts 'Total: ' + evenNumberTotal.to_s