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fixdiv(3alleg4) Allegro manual fixdiv(3alleg4)


fixdiv - Fixed point division. Allegro game programming library.


#include <allegro.h>

fixed fixdiv(fixed x, fixed y);


A fixed point value can be divided by an integer with the normal `/' operator. To divide two fixed point values, though, you must use this function. If a division by zero occurs, `errno' will be set and the maximum possible value will be returned, but `errno' is not cleared if the operation is successful. This means that if you are going to test for division by zero you should set `errno=0' before calling fixdiv(). Example:

   fixed result;
   /* This will put 0.06060 `result'. */
   result = fixdiv(itofix(2), itofix(33));
   /* This will put 0 into `result'. */
   result = fixdiv(0, itofix(-30));
   /* Sets `errno' and puts -32768 into `result'. */
   result = fixdiv(itofix(-100), itofix(0));
   ASSERT(!errno); /* This will fail. */


Returns the result of dividing `x' by `y'. If `y' is zero, returns the maximum possible fixed point value and sets `errno' to ERANGE.


fixadd(3alleg4), fixsub(3alleg4), fixmul(3alleg4), exfixed(3alleg4)
version 4.4.2 Allegro