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July 1, 2012 22:32
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Euler Project in Ruby - Problem 2
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# Create Fibonnaci Array | |
a = [1,2] | |
upto = 4_000_000 | |
while a[-2] + a[-1] < upto | |
a << a[-2] + a[-1] | |
end | |
# Create sum of even Fibonnaci numbers | |
sum = 0 | |
a.each { |x| sum+= x if x.even? } | |
puts "The result is #{sum}" |
Here's my solution. Personally find it easier to understand than the one given
a = 0 #first fibonnaci number
b = 1 #second fibonnaci number
c = 0 #current fibonnaci number
sumevens = 0 #sum of even fibonnaci numbers less than 4,000,000
while c <= 4000000
c = a + b
a = b
b = c
sumevens += c if c % 2 == 0
end
puts sumevens
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I think the initial array should be [1,1] to get the correct sequence. 1, 1, 2, 3, 5... etc