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* forcing float arithmetic.
@ 2021-03-24 17:19 Ray Andrews
  2021-03-24 17:56 ` Bart Schaefer
  0 siblings, 1 reply; 10+ messages in thread
From: Ray Andrews @ 2021-03-24 17:19 UTC (permalink / raw)
  To: Zsh Users


    #integer nn=4
    typeset -F nn=4
    typeset -F aa=

    (( aa = ((2 * nn) - 1) / (nn**2) ))
    echo $aa

If 'nn' is declared as an integer the above echos zero but if as a float 
the answer is correct.  But nn will never actually be other than an 
integer so I don't like to declare it as a float.  Am I not expecting 
successful arithmetic even with the integer?  I know you can force the 
issue with:

(( aa = ((2 * nn) - 1) / (nn**2.0) ))

... but I wonder why that's needed.  Why are answers dumbed down like 
that?  It's clearly a design decision but it seems to me unnatural.  If 
'aa' was an integer too I understand the result would have to be rounded 
down to zero, but since aa is a float, shouldn't all arithmetic 
automatically produce floating point results?





^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2021-03-25  3:22 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-03-24 17:19 forcing float arithmetic Ray Andrews
2021-03-24 17:56 ` Bart Schaefer
2021-03-24 21:51   ` Ray Andrews
2021-03-24 21:54     ` Roman Perepelitsa
2021-03-24 21:59       ` Bart Schaefer
2021-03-25  1:12         ` Ray Andrews
2021-03-25  1:36           ` Daniel Shahaf
2021-03-25  1:45             ` Ray Andrews
2021-03-25  2:37               ` Bart Schaefer
2021-03-25  3:22                 ` Ray Andrews

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