Project Euler: problem 2 http://projecteuler.net/problem=2

problem2.rb

puts 'Enter maximum range of Fibonacci sequence:'

num = gets.chomp.to_i

def fib(num)
  sum = 0·
  first = 0
  second = 1
  even = 0
  (1..num).each do |i|
    sum = first + second
    #puts "fib: #{sum}"
    even += sum if (sum%2 == 0)
    #puts "even sum: #{even}"
    first = second
    second = sum
  end
  puts "The sum of even-valued Fibonacci numbers up to #{num} is equal to #{even}."
end

fib(num)