Re: Power function as operator

Hi Niel, On Sat, Nov 23, 2013 at 6:27 AM, Niel Archer <spam-free@blueyonder.co.uk>wrote: > > On 22 November 2013 17:08, Sherif Ramadan <theanomaly.is@gmail.com> > wrote: > > > I definitely like the idea of having pow as an operator. I've actually > been > > > wanting to copy that from Python for a while. I'm all for it. > > > > On 22 November 2013 19:56, Sherif Ramadan <theanomaly.is@gmail.com> > wrote: > > > That looks very wrong. pow(pow(2,3),2) == 64 > > > > > > Exponent precedence should always be one higher than multiplication > > > precedence. > > > > Where Tjerk has placed it is exactly as python has it. I think right > > assoc is the correct choice here. If you imagine 2^3^2 written down, > > you would do 2^(3^2), not (2^3)^2 > > No, I would do the latter and get 64 as Sherif did. Basic math rule I > learned as a child, is to work left to right unless priority is > indicated by parentheses. > Children shouldn't be using power tools in the first place ;-) Jokes aside, if you write down multiple exponents you would stack them up, evaluating them from top to bottom (i.e. right associative). > > Python 2.7.3 (default, Jan 2 2013, 13:56:14) > > [GCC 4.7.2] on linux2 > > Type "help", "copyright", "credits" or "license" > > for more information. > > >>> 2 ** 3 ** 2 > > 512 > > > > -- > > PHP Internals - PHP Runtime Development Mailing List > > To unsubscribe, visit: http://www.php.net/unsub.php > -- > Niel Archer > niel.archer (at) blueyonder.co.uk > > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > > -- -- Tjerk