Casting and Optimization Flags

[Colin Law]

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>casting floats to integers does not round; it truncates
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Thanks for the replies.  Why was this behaviour more (only!) obvious 
when I used the compiler optimization flags? Had I not tried this, I 
would be quite oblivious to the problem, which could have been very 
difficult to track down futher down the line.

Thanks for the bit twiddling hack link Eljay, some of these will do 
exactly what I'm looking for.

~Colin.