# Finding the sum of even Fibonaccis

This problem comes from Project Euler. Project Euler is a website with a bunch of computational problems designed to be solved with software applications.

**find_sum_of_**even_fibonaccis**.rb**

```
=begin
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.
=end
class Euler
def self.sum_of_even_fibonaccis(number)
fibonaccis = []
sum = 0
a = 0
b = 1
while b < number do
fibonaccis.push(b)
a, b = b, a + b
end
fibonaccis.each do |n|
if n % 2 == 0
sum += n
end
end
puts sum
end
end
```

This can be executed from the command line by running:

*ruby -r "./*find_sum_of_even_fibonaccis*.rb" -e "Euler.sum_of_*even_fibonaccis* *4*000*000*"*