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al_fixacos(3)		    Library Functions Manual		   al_fixacos(3)

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 must be a fixed point value.  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.

Allegro reference manual					   al_fixacos(3)

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