subtraction of floating point numbers

Alain Ketterlin alain at
Fri Feb 24 09:49:15 CET 2012

Jaroslav Dobrek <jaroslav.dobrek at> writes:

> when I have Python subtract floating point numbers it yields weird
> results. Example:
> 4822.40 - 4785.52 = 36.8799999999992

We've had this discussion here one or two days ago...

The usual answer is: please read "What Every Computer Scientist Should
Know About Floating Point Arithmetic", at:

and check the answers posted these last days. In brief: you're working
with floating point numbers, not reals (i.e., real "reals"). That's
life. Deal with it, or move to specialized packages, like decimal.

-- Alain.

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