1fixacos(3)                      Allegro manual                      fixacos(3)
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NAME

6       fixacos  -  Fixed  point inverse cosine lookup table. Allegro game pro‐
7       gramming library.
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SYNOPSIS

10       #include <allegro.h>
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13       fixed fixacos(fixed x);
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DESCRIPTION

16       This function finds the inverse cosine of a value using a lookup table.
17       The  input  value  must  be a fixed point radian. The inverse cosine is
18       defined only in the domain from `-1' to  `1'.  Outside  of  this  input
19       range, the function will set `errno' to EDOM and return zero. Example:
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21          fixed result;
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23          /* Sets `result' to binary angle 128. */
24          result = fixacos(itofix(-1));
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RETURN VALUE

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

33Allegro                          version 4.2.3                      fixacos(3)
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