RE: [avr-gcc-list] Rounded integral division in preprocessor

[Dave Hansen]

From: address@hidden:

> I'm trying to do rounded (opposed to truncated) integer division with
> avr-gcc with using only preprocessor magic. This proves to be difficult:
> The current code I'm using is
>
> #define __IDIV(x, y) (long)(((long)x + ((long)y / 2L)) / (long)y)
> #define IDIV(x, y) (__IDIV((x), (y)))
 
I'm not sure why you're getting the error message, but the above seems 
unnecessarily complex.  For what it's worth, the following should have 
equivalent functionality, and does not generate the error:
 
#define IDIV(x,y) ( ((x)+(y)/2L)/(y) )
 
Regards,
 
   -=Dave
                                          
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