'goto" gone from computer languages or is it!
Dave Dunfield
dave04a at dunfield.com
Fri May 13 19:11:18 CDT 2005
At 18:33 13/05/2005 -0400, you wrote:
>> Now, tell me what will be printed:
>
>> int i = 0;
>> i = i++;
>> printf("%d\n", i);
>
>Whatever the implementation feels like giving you.
EXACTLY! - that is the only truly correct answer.
Expected/likely answers are 0 and/or 1 ... but this is NOT
guaranteed by the standard.
>Again, i is being modified multiple times between sequence points, so
>it's nasal demon time.
Although the nasal demon theory has been around for a long time, I
am certain that this will not be the result here - not of my machines
are fitted with appropriate I/O hardware to cause this - but as was
pointed out many years ago - it COULD be the result!
Yes - this is essentually the same scenario - I just removed any
doubt caused by order of execution of function parameters - this is
an example of prime undefined behaviour.
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PS: Sorry to be so brief on the phone (family movie in progress)...
see you on sunday.
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.parse.com/~ddunfield/museum/index.html
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