Spigot Algorithm for Pi?

I want to be able to understand how you can use a spigot algorithm for calculating the digits of pi. However, every site I've visited hasn't made much sense, and goes way to fast talking about "Reduce the ith part of A..blah blah blah blah...and then take the pre-digit....blah blah blah". If... show more I want to be able to understand how you can use a spigot algorithm for calculating the digits of pi. However, every site I've visited hasn't made much sense, and goes way to fast talking about "Reduce the ith part of A..blah blah blah blah...and then take the pre-digit....blah blah blah". If someone could explain how this works to a guy going into Calculus, that would be great.
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