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Re: printf builtin bug?


From: Chet Ramey
Subject: Re: printf builtin bug?
Date: Mon, 27 Dec 2004 16:01:49 -0500

> Machine Type: i586-mandrake-linux-gnu
>                                                                               
>   
> Bash Version: 2.05b
> Patch Level: 0
> Release Status: release
>                                                                               
>   
> Description:
>         printf builtin rounds some decimals incorrectly.
>                                                                               
>   
> Repeat-By:
>         $ printf %.f 1.000000000000000000001; echo
>         0
>         $ printf %.f 1.00000000000000000001; echo
>         0
>         $ printf %.f 1.0000000000000000001; echo
>         1
>         $ printf %.f 1.00000000000000000000; echo
>         1

The printf builtin doesn't really do any rounding itself.  It calls strtold
to convert the argument and printf to print it.  I'd say the problem lies in
the C library, especially since I can reproduce the above error only on
Red Hat Linux 8.0.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet )
                                                Live...Laugh...Love
Chet Ramey, ITS, CWRU    address@hidden    http://tiswww.tis.cwru.edu/~chet/




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