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Re: OT: Assignment operator (Was: using same variable twice on same page) [message #171377 is a reply to message #171344]

Fri, 31 December 2010 02:07

The Natural Philosoph
Messages: 993
Registered: September 2010

Karma:

Senior Member

August Karlstrom wrote:
> On 2010-12-30 05:47, Jerry Stuckle wrote:
>> On 12/29/2010 8:07 PM, August Karlstrom wrote:
>>> On 2010-12-29 11:42, Derek Turner wrote:
>>>> On Tue, 28 Dec 2010 22:07:55 -0700, richard wrote:
>>>>
>>>> > <?php if ($year="1961")
>>>>
>>>> This simply sets $year to "1961" and will always return 'true'
>>>
>>> ...which is more or less a flaw in the language design copied from C.
>>
>> Not at all. == is a completely different operator than =. Just like ++
>> is not the same as +.
>
> The equal sign `=' has been used in mathematics since medieval times to
> denote equality. To use `==' for equality and `=' for something else
> (assignment) is not sensible.
>
well in assembler its

MOV b,a
or
CMP a,b

And it used to be
LET a=b
and
if a=b

But the drive towards compactness on like editors meant that it got
turned into a=b;

You might argue endlessly about the need for two different operators and
whether 'a equals b' is more natural to regard as an assignment or a
comparison.

I argue that complex conditionals and assignments depending on them get
pretty screwed if you let the compiler decide what you really mean.

take

(a=b==c)

Its very clear which is an assignment and which is a comparison, though
the order or precedence is less so..

I don't know how you would write than in 'context dependent equals'
language, at all.

>
> /August
>

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[Message index]

		using same variable twice on same page By: richard on Wed, 29 December 2010 05:07
		Re: using same variable twice on same page By: Adrienne Boswell on Wed, 29 December 2010 06:56
		Re: using same variable twice on same page By: Thomas 'PointedEars' on Wed, 29 December 2010 11:25
		Re: using same variable twice on same page By: Jerry Stuckle on Wed, 29 December 2010 13:19
		Re: using same variable twice on same page By: Evan Platt on Wed, 29 December 2010 15:10
		Re: using same variable twice on same page By: Denis McMahon on Wed, 29 December 2010 15:21
		Re: using same variable twice on same page By: Jerry Stuckle on Wed, 29 December 2010 17:11
		Re: using same variable twice on same page By: richard on Wed, 29 December 2010 16:02
		Re: using same variable twice on same page By: Thomas 'PointedEars' on Wed, 29 December 2010 16:44
		Re: using same variable twice on same page By: Evan Platt on Wed, 29 December 2010 16:59
		Re: using same variable twice on same page By: Derek Turner on Wed, 29 December 2010 10:42
		Re: using same variable twice on same page By: August Karlstrom on Thu, 30 December 2010 01:07
		Re: using same variable twice on same page By: Thomas 'PointedEars' on Thu, 30 December 2010 01:31
		Re: using same variable twice on same page By: Jerry Stuckle on Thu, 30 December 2010 04:47
		OT: Assignment operator (Was: using same variable twice on same page) By: August Karlstrom on Thu, 30 December 2010 14:35
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: Jerry Stuckle on Thu, 30 December 2010 15:57
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: Jim Higgins on Thu, 30 December 2010 18:36
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: sheldonlg on Wed, 12 January 2011 15:50
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: richard on Thu, 30 December 2010 19:21
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: August Karlstrom on Thu, 30 December 2010 19:45
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: sheldonlg on Wed, 12 January 2011 15:53
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: Norman Peelman on Thu, 30 December 2010 23:43
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: The Natural Philosoph on Fri, 31 December 2010 02:07
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: August Karlstrom on Fri, 31 December 2010 10:14
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: The Natural Philosoph on Fri, 31 December 2010 10:47
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: Jim Higgins on Fri, 31 December 2010 16:12
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: me on Fri, 31 December 2010 16:33
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: sheldonlg on Wed, 12 January 2011 15:57
		Re: OT: Assignment operator By: Sherm Pendley on Wed, 12 January 2011 16:05
		Re: OT: Assignment operator By: spambait on Wed, 12 January 2011 18:43
		Re: OT: Assignment operator By: spambait on Wed, 12 January 2011 18:47
		Re: OT: Assignment operator By: sheldonlg on Wed, 12 January 2011 23:14
		Re: OT: Assignment operator (Was: using same variable twice on same page) By: Jim Higgins on Wed, 12 January 2011 20:28
		Re: using same variable twice on same page By: The Natural Philosoph on Thu, 30 December 2010 09:26
		Re: using same variable twice on same page By: Tim Streater on Thu, 30 December 2010 10:13
		Re: using same variable twice on same page By: Jerry Stuckle on Thu, 30 December 2010 13:05
		Re: using same variable twice on same page By: The Natural Philosoph on Fri, 31 December 2010 01:57
		Re: using same variable twice on same page By: Tim Streater on Fri, 31 December 2010 09:57
		Re: using same variable twice on same page By: sheldonlg on Wed, 12 January 2011 15:54
		Re: using same variable twice on same page By: Peter H. Coffin on Thu, 30 December 2010 13:35
		Re: using same variable twice on same page By: The Natural Philosoph on Fri, 31 December 2010 01:59
		Re: using same variable twice on same page By: Jerry Stuckle on Wed, 29 December 2010 13:21
		Re: using same variable twice on same page By: Captain Paralytic on Wed, 29 December 2010 14:15
		Re: using same variable twice on same page By: Jerry Stuckle on Wed, 29 December 2010 15:00
		Re: using same variable twice on same page By: Derek Turner on Wed, 29 December 2010 17:22
		Re: using same variable twice on same page By: Luuk on Wed, 29 December 2010 15:05
		Re: using same variable twice on same page By: spambait on Wed, 05 January 2011 01:10
		Re: using same variable twice on same page By: richard on Wed, 29 December 2010 15:57
		Re: using same variable twice on same page By: Captain Paralytic on Wed, 29 December 2010 16:53
		Re: using same variable twice on same page By: Jerry Stuckle on Wed, 29 December 2010 17:21
		Re: using same variable twice on same page By: Captain Paralytic on Wed, 29 December 2010 18:00
		Re: using same variable twice on same page By: Derek Turner on Wed, 29 December 2010 17:44
		Re: using same variable twice on same page By: Denis McMahon on Wed, 29 December 2010 15:02
		Re: using same variable twice on same page By: Denis McMahon on Wed, 29 December 2010 15:15
		Re: using same variable twice on same page By: Tim Streater on Wed, 29 December 2010 22:53
		Re: using same variable twice on same page By: Captain Paralytic on Wed, 29 December 2010 23:05
		Re: using same variable twice on same page By: The Natural Philosoph on Thu, 30 December 2010 09:24
		Re: using same variable twice on same page By: spambait on Wed, 05 January 2011 01:00

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