A small puzzle for you all -- I got it right before running it

iv1, iv2, = 5, 6
iv1, iv2 = iv2, iv1;
print iv1
print iv2
iv1, iv2, = 5, 6
iv1, iv2 = iv2+1, iv1+1;
print iv1
print iv2

What values are printed?
==John ffitch


PS This could be a reason not to allow this!

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Well, at first glance it looks like it should print:

6
5
7
6

but my guess from your email is that the expressions don't work as
expected, so perhaps:

6
5
7
8

?



On Fri, Feb 12, 2010 at 12:49 PM, jpff  wrote:
> A small puzzle for you all -- I got it right before running it
>
> iv1, iv2, = 5, 6
> iv1, iv2 = iv2, iv1;
> print iv1
> print iv2
> iv1, iv2, = 5, 6
> iv1, iv2 = iv2+1, iv1+1;
> print iv1
> print iv2
>
> What values are printed?
> ==John ffitch
>
>
> PS This could be a reason not to allow this!
>
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev
> _______________________________________________
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> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel
>

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6 5 7 6? But that's the obvious answer so I'm guessing it's not right!


On 12 February 2010 17:49, jpff  wrote:
> A small puzzle for you all -- I got it right before running it
>

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> 6 5 7 6? But that's the obvious answer so I'm guessing it's not right!
>
>

To put you out of your misery the answer is

instr 1:  iv1 = 6.000
instr 1:  iv2 = 6.000
instr 1:  iv1 = 7.000
instr 1:  iv2 = 6.000


Now explain!  Really is esay if you understand how Csound works......

==John


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PS: I do know how the "fix" but it may slow down all assignments a bit

>> 6 5 7 6? But that's the obvious answer so I'm guessing it's not right!
>>
>>
>
> To put you out of your misery the answer is
>
> instr 1:  iv1 = 6.000
> instr 1:  iv2 = 6.000
> instr 1:  iv1 = 7.000
> instr 1:  iv2 = 6.000
>
>
> Now explain!  Really is esay if you understand how Csound works......
>
> ==John
>
>
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev
> _______________________________________________
> Csound-devel mailing list
> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel
>
>
>



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No.
On 12 Feb 2010, at 18:23, jpff@cs.bath.ac.uk wrote:

> PS: I do know how the "fix" but it may slow down all assignments a bit
>
>>> 6 5 7 6? But that's the obvious answer so I'm guessing it's not  
>>> right!
>>>
>>>
>>
>> To put you out of your misery the answer is
>>
>> instr 1:  iv1 = 6.000
>> instr 1:  iv2 = 6.000
>> instr 1:  iv1 = 7.000
>> instr 1:  iv2 = 6.000
>>
>>
>> Now explain!  Really is esay if you understand how Csound works......
>>
>> ==John
>>
>>
>> ------------------------------------------------------------------------------
>> SOLARIS 10 is the OS for Data Centers - provides features such as  
>> DTrace,
>> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>> http://p.sf.net/sfu/solaris-dev2dev
>> _______________________________________________
>> Csound-devel mailing list
>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>>
>>
>>
>
>
>
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as  
> DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev
> _______________________________________________
> Csound-devel mailing list
> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel


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Well, I'm assuming then that all the iv1's and iv2's are all pointing
to the same address rather than using any temporary memory address
between read and writes. If so, that'd explain the first two 6's as
it'd get processed like:

iv1 = iv2
iv2 = iv1

The fix you were talking about, should it be that all of the right
hand args should be read first and stored in temp variables before
assigning to left-hand args?

steven

On Fri, Feb 12, 2010 at 1:20 PM,   wrote:
>> 6 5 7 6? But that's the obvious answer so I'm guessing it's not right!
>>
>>
>
> To put you out of your misery the answer is
>
> instr 1:  iv1 = 6.000
> instr 1:  iv2 = 6.000
> instr 1:  iv1 = 7.000
> instr 1:  iv2 = 6.000
>
>
> Now explain!  Really is esay if you understand how Csound works......
>
> ==John
>
>
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev
> _______________________________________________
> Csound-devel mailing list
> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel
>

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wow, i got it right.

the order of operations i surmised...

iv1 = 5
iv2 = 6
iv1 = iv2
iv2 = iv1
iv1 = 5
iv2 = 6
iv1_internal = iv2 + 1
iv2_internal = iv1 + 1
iv1 = iv2_internal
iv2 = iv1_internal


On Fri, Feb 12, 2010 at 2:47 PM, Victor Lazzarini
 wrote:
> No.
> On 12 Feb 2010, at 18:23, jpff@cs.bath.ac.uk wrote:
>
>> PS: I do know how the "fix" but it may slow down all assignments a bit
>>
>>>> 6 5 7 6? But that's the obvious answer so I'm guessing it's not
>>>> right!
>>>>
>>>>
>>>
>>> To put you out of your misery the answer is
>>>
>>> instr 1:  iv1 = 6.000
>>> instr 1:  iv2 = 6.000
>>> instr 1:  iv1 = 7.000
>>> instr 1:  iv2 = 6.000
>>>
>>>
>>> Now explain!  Really is esay if you understand how Csound works......
>>>
>>> ==John
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> SOLARIS 10 is the OS for Data Centers - provides features such as
>>> DTrace,
>>> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>>> http://p.sf.net/sfu/solaris-dev2dev
>>> _______________________________________________
>>> Csound-devel mailing list
>>> Csound-devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>>>
>>>
>>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> SOLARIS 10 is the OS for Data Centers - provides features such as
>> DTrace,
>> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>> http://p.sf.net/sfu/solaris-dev2dev
>> _______________________________________________
>> Csound-devel mailing list
>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>
>
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev
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> Csound-devel mailing list
> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel
>

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On 13/02/2010, at 8:04 AM, fons@kokkinizita.net wrote:
> Python gets that right:
>
> a,b = b,a
>
> will swap the values of a and b.
Not quite = depends on the mutability of a and b. Won't work for  
tuples for eg.
D.


________________________________________________
Dr David Worrall.
- Experimental Polymedia:	  worrall.avatar.com.au
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- Education for Financial Independence: www.mindthemarkets.com.au







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You win a coconut!  But you did not ecplsin the second case!


> Well, I'm assuming then that all the iv1's and iv2's are all pointing
> to the same address rather than using any temporary memory address
> between read and writes. If so, that'd explain the first two 6's as
> it'd get processed like:
>
> iv1 = iv2
> iv2 = iv1
>
> The fix you were talking about, should it be that all of the right
> hand args should be read first and stored in temp variables before
> assigning to left-hand args?
>
> steven
>
> On Fri, Feb 12, 2010 at 1:20 PM,   wrote:
>>> 6 5 7 6? But that's the obvious answer so I'm guessing it's not right!
>>>
>>>
>>
>> To put you out of your misery the answer is
>>
>> instr 1:  iv1 = 6.000
>> instr 1:  iv2 = 6.000
>> instr 1:  iv1 = 7.000
>> instr 1:  iv2 = 6.000
>>
>>
>> Now explain!  Really is esay if you understand how Csound works......
>>
>> ==John
>>
>>
>> ------------------------------------------------------------------------------
>> SOLARIS 10 is the OS for Data Centers - provides features such as
>> DTrace,
>> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>> http://p.sf.net/sfu/solaris-dev2dev
>> _______________________________________________
>> Csound-devel mailing list
>> Csound-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>>
>
> ------------------------------------------------------------------------------
> SOLARIS 10 is the OS for Data Centers - provides features such as DTrace,
> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
> http://p.sf.net/sfu/solaris-dev2dev
> _______________________________________________
> Csound-devel mailing list
> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel
>
>
>



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> wow, i got it right.
>

You win the first prize!  Such fun!


> the order of operations i surmised...
>
> iv1 = 5
> iv2 = 6
> iv1 = iv2
> iv2 = iv1
> iv1 = 5
> iv2 = 6
> iv1_internal = iv2 + 1
> iv2_internal = iv1 + 1
> iv1 = iv2_internal
> iv2 = iv1_internal
>
>
> On Fri, Feb 12, 2010 at 2:47 PM, Victor Lazzarini
>  wrote:
>> No.
>> On 12 Feb 2010, at 18:23, jpff@cs.bath.ac.uk wrote:
>>
>>> PS: I do know how the "fix" but it may slow down all assignments a bit
>>>
>>>>> 6 5 7 6? But that's the obvious answer so I'm guessing it's not
>>>>> right!
>>>>>
>>>>>
>>>>
>>>> To put you out of your misery the answer is
>>>>
>>>> instr 1:  iv1 = 6.000
>>>> instr 1:  iv2 = 6.000
>>>> instr 1:  iv1 = 7.000
>>>> instr 1:  iv2 = 6.000
>>>>
>>>>
>>>> Now explain!  Really is esay if you understand how Csound works......
>>>>
>>>> ==John
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> SOLARIS 10 is the OS for Data Centers - provides features such as
>>>> DTrace,
>>>> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>>>> http://p.sf.net/sfu/solaris-dev2dev
>>>> _______________________________________________
>>>> Csound-devel mailing list
>>>> Csound-devel@lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> SOLARIS 10 is the OS for Data Centers - provides features such as
>>> DTrace,
>>> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>>> http://p.sf.net/sfu/solaris-dev2dev
>>> _______________________________________________
>>> Csound-devel mailing list
>>> Csound-devel@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>>
>>
>> ------------------------------------------------------------------------------
>> SOLARIS 10 is the OS for Data Centers - provides features such as
>> DTrace,
>> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
>> http://p.sf.net/sfu/solaris-dev2dev
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>> Csound-devel mailing list
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>> https://lists.sourceforge.net/lists/listinfo/csound-devel
>>
>
> ------------------------------------------------------------------------------
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> Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
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> https://lists.sourceforge.net/lists/listinfo/csound-devel
>
>
>



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