Printing Crashes Rev in OSX

Frank D. Engel, Jr. fde101 at fjrhome.net
Wed Feb 2 18:23:26 CST 2005


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Alas, the rather stupid syntax introduced by C (or some older language) 
and quickly adopted by the masses!  Stupid nevertheless.

In C, Transcript, etc. - once you match a single 'case', any future 
'case' items are ignored.  'break' gets you out.  This is because C, 
etc. limit you to *one* matching item per 'case'; in essence:

switch whatever
case 1: do this; break;
case 2: do this; break;
...
end switch

what if you want the same code to execute for both 3 and 4?  In 
C/Transcript, you can't do this:

switch whatever
case 3, 4: do this; break;
...
end switch


so you do this instead:

switch whatever
case 3:
case 4: do this; break;
...
end switch

and the 'case 4' is ignored if the '3' matches, allowing for multiple 
matching cases like this.  Pascal, Ada, etc. have the superior syntax; 
in Ada for example:

case whatever is
     when 1 ==> do this;
     when 2 ==> do this;
     when 3 | 4 ==> do this;
     when others ==> do this;
end case;

No messy 'break' statements to deal with, and it is still rather 
readable.  You can do ranges, too, like

     when 4..7 ==> do this;


Pascal's syntax looks slightly different, but is similar:

case whatever of
     1: do this;
     2: do this;
     3, 4: do this;
end;


On Feb 2, 2005, at 6:17 PM, Sivakatirswami wrote:

> Dan, Indeed, one would expect the drop-through if there is no "break"
>
> but, how would
>
> case "Quit"
>
> evaluate to "true" when the parameter
> passed from the menuPick was "Print"
> ??
>
> That's what is mysterious.
>
> Sivakatirswami
>
>
>
> On Feb 1, 2005, at 6:38 PM, Dan Shafer wrote:
>
>> Actually, the drop-through is exactly what I'd expect. ;-) Otherwise, 
>> how would you execute more than one case in a switch statement?
>>
>>
>> On Feb 1, 2005, at 8:09 PM, Sivakatirswami wrote:
>>
>>> one  would not expect the switch to dropdown to "quit" since quit 
>>> was not chosen, but that appears to be what happened.
>>
>> _______________________________________________
>> use-revolution mailing list
>> use-revolution at lists.runrev.com
>> http://lists.runrev.com/mailman/listinfo/use-revolution
>>
>
> _______________________________________________
> use-revolution mailing list
> use-revolution at lists.runrev.com
> http://lists.runrev.com/mailman/listinfo/use-revolution
>
>
- -----------------------------------------------------------
Frank D. Engel, Jr.  <fde101 at fjrhome.net>

$ ln -s /usr/share/kjvbible /usr/manual
$ true | cat /usr/manual | grep "John 3:16"
John 3:16 For God so loved the world, that he gave his only begotten 
Son, that whosoever believeth in him should not perish, but have 
everlasting life.
$
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