mbailey/gist:1531950

Created December 29, 2011 04:43

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Should I not use ruby to add dollar values?

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gistfile1.txt

	mbailey@oasis:~ $ irb
	1.9.2p290 :001 > 120.82+15.96+135.50
	=> 272.28
	1.9.2p290 :002 > 120.82+15.96+135.51
	=> 272.28999999999996

mipearson commented Dec 30, 2011

@seancaffery: I disagree. Use a dedicated fixed-point decimal class or represent all monetary amounts internally as their smallest possible fraction. Eg, represent $100.00 as 10000, or two dollars fifty as $2.50.

If you get into a situation where you need to divide the amount, clever use of floor and ceil will ensure you have no leftovers.

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