fixdiv (3) Linux Manual Page
fixdiv – Fixed point division. Allegro game programming library.
Synopsis
#include <allegro.h> fixed fixdiv(fixed x, fixed y);
Description
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. */