From: jdh <dhenman@gmail.com>
To: zsh-workers@zsh.org
Subject: Math expression evaluation error?
Date: Fri, 09 Jan 2015 11:46:44 -0800 [thread overview]
Message-ID: <54B03024.1030309@gmail.com> (raw)
I believe I read that math expression evaluation will convert all
calculations in an expression if "any" value in that expression is a
real value.
That is not true if the word "any" is true or a bug has crawled into the
numeric expression evaluator. Or I read wrong..
Example on my system, zsh 5.0.7 (i686-pc-linux-gnu), I get the following
results for the shown example:
$ echo $(( 6+3/8. + 10 + 5/8. )) $(( 6+3/8 + 10 + 5/8. ))
17. 16.625
In the above case only the second term which contains a real number is
evaluated as real , the previous term is taken as integer and decimal
values are truncated (non-existent. This same behavior is demonstrated
in zcalc. Probably uses the same logic.
Though I understand why this happens (or think I do). It could cause
someone a major mistake if they are unaware of this and rely on the outcome.
Regards
Darel
next reply other threads:[~2015-01-09 19:47 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-09 19:46 jdh [this message]
2015-01-09 20:15 ` Peter Stephenson
2015-01-09 21:40 ` jdh
2015-01-09 22:19 ` Ray Andrews
2015-01-09 23:06 ` Lawrence Velázquez
2015-01-09 23:52 ` Ray Andrews
2015-01-10 0:25 ` Bart Schaefer
2015-01-10 7:27 ` Ray Andrews
2015-01-10 16:53 ` Bart Schaefer
2015-01-10 18:48 ` Ray Andrews
2015-01-10 19:14 ` Bart Schaefer
2015-01-10 22:21 ` Ray Andrews
2015-01-11 1:51 ` Bart Schaefer
2015-01-11 5:10 ` Ray Andrews
2015-01-12 9:17 ` Vincent Lefevre
2015-01-12 16:18 ` ZyX
2015-01-13 16:00 ` Vincent Lefevre
2015-01-13 23:03 ` ZyX
2015-01-14 14:47 ` Vincent Lefevre
2015-01-14 21:37 ` ZyX
2015-01-15 13:34 ` Vincent Lefevre
2015-01-15 13:41 ` Vincent Lefevre
2015-01-15 18:32 ` ZyX
2015-01-15 21:57 ` Bart Schaefer
2015-01-09 22:40 ` Peter Stephenson
2015-01-12 10:55 ` Peter Stephenson
2015-01-14 15:02 ` Vincent Lefevre
2015-01-14 15:38 ` Peter Stephenson
2015-01-15 14:58 ` Peter Stephenson
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