al_fixacos - Online Linux Manual PageSection : 3
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Source : Allegro reference manual
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NAMEal_fixacos − Allegro 5 API

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SYNOPSIS #include <allegro5/allegro.h> al_fixed al_fixacos(al_fixed x);

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DESCRIPTIONThis 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));

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RETURN VALUEReturns 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. 0

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