On Fri, 2012-01-13 at 08:09 -0600, Andrew Wiley wrote: > On Fri, Jan 13, 2012 at 7:47 AM, Manu <[email protected]> wrote: > > On 13 January 2012 14:48, bearophile <[email protected]> wrote: > >> > >> This is the third time I see people trip on power operator precedence: > >> http://d.puremagic.com/issues/show_bug.cgi?id=7268 > >> > >> Some people expect this: > >> (-10 ^^ 2) > >> To be 100 instead of -100 > >> (Note: Python here uses the same operator precedences.) > >> > >> Do you think it's worth (and possible) to help D programmers avoid this > >> mistake in their code? > > > > > > I would certainly have made this mistake if I tried it. And knowing this > > information will not cause me to do it properly, it will simply make me > > question my code, and become very suspicious every time I ever use the > > operator (ie. I will never understand the proper precedence, I don't think > > it makes sense). > > I'm fairly amazed it's not the other way around... what's the logic behind > > this? > > The logic is that the precedence in the language matches the > precedence of a written equation.
The problem here is the conflict introduced by allowing -10 to be the application of the unary minus operator to the positive value 10 instead of being a representation of the negative integer value -10. BODMAS covers everything. -- Russel. ============================================================================= Dr Russel Winder t: +44 20 7585 2200 voip: sip:[email protected] 41 Buckmaster Road m: +44 7770 465 077 xmpp: [email protected] London SW11 1EN, UK w: www.russel.org.uk skype: russel_winder
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