double
acos(double x)
float
acosf(float x)
)
and
acosf()
functions compute the principal value of the arc cosine of
x
in the range
[0],.
x)
and
acosf(x)
set the global variable
errno
to EDOM.
)
function conforms to
ANSI X3.159-1989 (``ANSI C89'') .