fixdiv (3) - Linux Manuals

fixdiv: Fixed point division. Allegro game programming library.

Command to display fixdiv manual in Linux: $ man 3 fixdiv

NAME

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. */

RETURN VALUE

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