From: "Christopher D." <lists@...>
Date: 2012-04-04T02:29:26+09:00
Subject: fibonacci and defining variables

I was doing an example on Fibonacci sequences and this confused me a
little. The problem happens because of how I define my variables. Can
someone explain to me how i, p = p, i + p does not equal i = p, p = i+p

Here is the correct program which returns: 1,1,2,3,5,8
def fib(max)
  i, p = 1, 1
  while i <= max
    yield i
    i, p = p, i+p
  end
end

fib(40) { |f| puts f }

Here is the incorrect problem which returns: 1,1,2,4,8

def fib(max)
  i, p = 1, 1
  while i <= max
    yield i
    i = p
    p = i+p
  end
end

fib(10) { |f| puts f }

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