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Re: My code find negative squares buggy?

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In article <d1e23965-ac9e-4bd7-9d3d-3af30643f383@googlegroups.com>,
<jonas.thornvall@gmail.com> wrote:

> Den fredagen den 10:e januari 2014 kl. 16:52:43 UTC+1 skrev Tim Streater:
> > In article <ed1316d2-3b87-4a4a-901a-05f6131e3e4f@googlegroups.com>,
> > 
> > <jonas.thornvall@gmail.com> wrote:

> > > This works fine
> > > square=Math.sqrt(number,2);
> > >   if(square-Math.floor(square)== 0){ctx.fillStyle = 'red';}

> > > This does not?
> > > negsquare=Math.sqrt(-number,2);

> > What does negsquare get set to?

> > > if(number<0 && negsquare-Math.floor(negsquare)== 0) {ctx.fillStyle =
> > > 'orange';}

> > And what does Math.floor do with whatever negsquare got set to above?

> If number is -50
> negsquare=Math.sqrt(-50,2);

But suppose number is +50. What does your code do then?

> negsquare=7,0710678118654752440084436210485 
> 
> Or? Isnt't sqrt=Math.sqrt(number,2); equivalent with
> negsqrt=Math.sqrt(-number,2); given that number is negative?
> 
> Which gives
> 
> if(-50<0 && 7,0710678118654752440084436210485-Math.floor(7,0710678118654752440084436210485 
> )== 0) {ctx.fillStyle ='orange';}
> 
> At least that is what i though it would do?

I expect you need to check operator precedence in your "if".

-- 
Tim

"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted"  --  Bill of Rights 1689

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My code find negative squares buggy? jonas.thornvall@gmail.com - 2014-01-10 07:40 -0800
  Re: My code find negative squares buggy? jonas.thornvall@gmail.com - 2014-01-10 07:44 -0800
  Re: My code find negative squares buggy? Tim Streater <timstreater@greenbee.net> - 2014-01-10 15:52 +0000
    Re: My code find negative squares buggy? jonas.thornvall@gmail.com - 2014-01-10 08:09 -0800
      Re: My code find negative squares buggy? Tim Streater <timstreater@greenbee.net> - 2014-01-10 16:19 +0000
        Re: My code find negative squares buggy? jonas.thornvall@gmail.com - 2014-01-10 08:32 -0800
      Re: My code find negative squares buggy? Christoph Michael Becker <cmbecker69@arcor.de> - 2014-01-10 17:58 +0100

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