On Tue, Nov 14, 2006 at 11:08:29AM +0000, Bastiaan Jacques wrote:
> +#ifndef trunc
> +#define trunc(a) static_cast<long>(a)
> +#endif
mmm... the manual page says:
These functions round x to the nearest integer not larger in absolute
value.
So I'd assume:
orig trunc
-1.2 -1
1.2 1
-2.9 -2
3.9 2
Now, the trunc() function takes and returns a 'double' type so we
must make sure we don't overflow the 'long' type.
BTW, floor does just that if we make sure we swap sign:
#define TRUNC(x) ( x < 0 ? -floor(-x) : floor(x) )
tested:
1.2: floor=1 trunc=1 TRUNC=1
-1.2: floor=-2 trunc=-1 TRUNC=-1
1.9: floor=1 trunc=1 TRUNC=1
-1.9: floor=-2 trunc=-1 TRUNC=-1
1.5: floor=1 trunc=1 TRUNC=1
-1.5: floor=-2 trunc=-1 TRUNC=-1
--strk;
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