Elementary confusion

Mark McEahern marklists at mceahern.com
Mon Sep 23 17:38:11 EDT 2002

> I am working through O'Reilly's "Learning Python". I am up to page 33,
> and already I have a problem. The text outlines a cli entry about math
> operators, all really straight forward;
> .>>>a=3
> .>>>b=4
> .>>>b/2+a
>  5
> .>>>b/(2.0+a)
>  0.8
> This is so straight forward that I wasn't going to type it in, but I
> did anyway, and got instead of '0.8' something I cannot account for. I
> got '0.80000000000000004'.
> So after 32 pages, I am already flumoxed. What is going on

This is a FAQ.  Please read the FAQ.  This has to do with floating point


// mark

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