Re: Results depending on evaluation order

in reply to Results depending on evaluation order

left to right evaluation:

10 - 10 + 14.4 = (10 - 10) + 14.4 = 0 + 14.4 = 14.4

I already explained that the mantissa needs to be shifted to loose precision.

Cheers Rolf

( addicted to the Perl Programming Language)

Comment on Re: Results depending on evaluation order Download Code

Replies are listed 'Best First'.
Re^2: Results depending on evaluation order by fishy (Friar) on Apr 23, 2014 at 16:50 UTC
Interesting. Thanks Rolf! What about eval? Why it got right evaluated?	[reply]
Re^3: Results depending on evaluation order by moritz (Cardinal) on Apr 23, 2014 at 17:51 UTC
eval expects a string, so the number is converted to a string, and the stringification rounds a tiny bit, so it accidentally produces the right result.	[reply]
Re^4: Results depending on evaluation order by choroba (Cardinal) on Apr 23, 2014 at 20:54 UTC
You can prepend a `q` before the `(` to make eval work correctly, i.e. report the difference. `$premium = eval q($number * ( 1 + 10/100 ));` [download] لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]

In Section Seekers of Perl Wisdom