Re: g++ Bug? Why w/ and w/o "O3" options gives different result(g++3.3.3) for this program?

[Ulrich Eckhardt]

Peng Yu wrote:

>>> #define L_x      5//10 //in the unit of \lambda\mathit{NA}
>>> #define L_y      5//10 //in the unit of \lambda\mathit{NA}
> 
> I changed the above statements to
> #define L_x      5.
> #define L_y      5.

Noooo.

float const L_x = 0.5f;
double const L_y = 0.5;

> But the results are still different. It seems that the division isn't
> the reason.

By point was also that 5//10 is not a division, as it might look at the
first glance!

Uli

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