Project Euler problem 2

problem2.rb

i         = 1
last      = 0
sum       = 0


begin
  temp_last, i = i, (i + last)
  
  if i % 2 == 0 then
    sum += i;
  end
  
  last = temp_last
end while i < 4000000

print "Answer is " + sum.to_s + "\n"