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May 22nd, 2018
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  1. #------------------------------------------------ Problem ------------------------------------------------#
  2.  
  3. #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:
  4.  
  5. #1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...
  6.  
  7. #By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
  8.  
  9.  
  10. #------------------------------------------------ Solution ------------------------------------------------#
  11. def sum_even_fib_upto(max)
  12. i1, i2 = 1, 2
  13. sum = 0
  14. while i1 <= max
  15. sum += i1 if (i1 % 2 == 0)
  16. i1, i2 = i2, i1+i2
  17. end
  18. return sum
  19. end
  20.  
  21. sum_even_fib_upto(4000000)
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