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- #------------------------------------------------ Problem ------------------------------------------------#
- #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.
- #------------------------------------------------ Solution ------------------------------------------------#
- def sum_even_fib_upto(max)
- i1, i2 = 1, 2
- sum = 0
- while i1 <= max
- sum += i1 if (i1 % 2 == 0)
- i1, i2 = i2, i1+i2
- end
- return sum
- end
- sum_even_fib_upto(4000000)
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