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Big Switch!!

 
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Neckruin



Joined: 17 Jan 2006
Posts: 66

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Big Switch!!
PostPosted: Mon Oct 23, 2006 4:45 am     Reply with quote
Hello,
I need to use a "switch" structure in which I'll have more than 30 different cases...
Is it recommended doing it as a "big switch-case"??
Any other option??

Thanks,

Juanma (the "big asker") :P
Ttelmah
Guest
PostPosted: Mon Oct 23, 2006 6:37 am     Reply with quote
No reason not to.
There are two different 'versions' of code generated by the switch statement though. If you use a normal 'switch', _with a 'default' statement present_, the code generated is exactly the same as if you used a whole tree of 'if' tests. If instead, you omit the 'default', the compiler will generate a much faster (for the latter tests), and more compact for dealing with a lot of tests, 'jump table'.
So it is more efficient, to have:
Code:

if (val>30) {
   'your default code here'
}
else {
   switch (val) {
   case 0:


   case 1:


......
   
   case 29:


   case 30:
//using all the cases 0..30 for the example given

   }
}


Best Wishes
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