I'm trying to write a function to calculate air density based on the 
following article:

http://en.wikipedia.org/wiki/Barometric_formula#Density_equations

My question is, is the "exp" function in the article the same as the 
"exp" function in POV-Ray? If not, what's the best way of going about 
writing these functions in SDL? My calculus is very rusty, but the 
description given here seems simple enough to implement:

http://en.wikipedia.org/wiki/Exponential_function#Continued_fractions_for_ex

-Mike

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