Re: -O option gives different running time!

[Armel Asselin]

> I am really new at C++ so can't figure it out why is it so different.
> Any idea?
-O stands for Optimize :) (mostly for __speed__ and a bit for size)
-O2 may still improve performance as well as various options 
(interprocedural optimizations, stack frame, disabling exceptions...)

the reason of the presence of such a flag is that the optimized program is 
generally less 'debug-able' because the instructions that you type in your 
C++ program are compiled with less fidelity but more performance in mind 
(still 'doing the same thing')

HIH
Armel