NAME

       al_fixacos - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              al_fixed al_fixacos(al_fixed x);

DESCRIPTION

       This  function  finds the inverse cosine of a value using a lookup table.  The input value
       must be a fixed point radian.  The inverse cosine is defined only in the domain from -1 to
       1.   Outside of this input range, the function will set Allegro's errno to EDOM and return
       zero.

       Example:

              al_fixed result;

              /* Sets result to binary angle 128. */
              result = al_fixacos(al_itofix(-1));

RETURN VALUE

       Returns the inverse sine of a fixed point value, measured as  fixed  point  binary  format
       angle,  or zero if the input was out of range.  All return values of this function will be
       in the range 0 to 128.

                                                   al_fixacos(3alleg5) Allegro reference manual()