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.nf
.b #include <math.h>
.pp
.bi "double acos(double " x );
.bi "float acosf(float " x );
.bi "long double acosl(long double " x );
.fi
.pp
link with \fi\-lm\fp.
.pp
.rs -4
feature test macro requirements for glibc (see
.br feature_test_macros (7)):
.re
.pp
.br acosf (),
.br acosl ():
.nf
_isoc99_source || _posix_c_source >= 200112l
|| /* since glibc 2.19: */ _default_source
|| /* glibc <= 2.19: */ _bsd_source || _svid_source
.fi
.sh description
these functions calculate the arc cosine of
.ir x ;
that is
the value whose cosine is
.ir x .
.sh return value
on success, these functions return the arc cosine of
.ir x
in radians; the return value is in the range [0,\ pi].
.pp
if
.i x
is a nan, a nan is returned.
.pp
if
.i x
is +1,
+0 is returned.
.pp
if
.i x
is positive infinity or negative infinity,
a domain error occurs,
and a nan is returned.
.pp
if
.i x
is outside the range [\-1,\ 1],
a domain error occurs,
and a nan is returned.
.sh errors
see
.br math_error (7)
for information on how to determine whether an error has occurred
when calling these functions.
.pp
the following errors can occur:
.tp
domain error: \fix\fp is outside the range [\-1,\ 1]
.i errno
is set to
.br edom .
an invalid floating-point exception
.rb ( fe_invalid )
is raised.
.sh attributes
for an explanation of the terms used in this section, see
.br attributes (7).
.ad l
.nh
.ts
allbox;
lbx lb lb
l l l.
interface attribute value
t{
.br acos (),
.br acosf (),
.br acosl ()
t} thread safety mt-safe
.te
.hy
.ad
.sp 1
.sh conforming to
c99, posix.1-2001, posix.1-2008.
.pp
the variant returning
.i double
also conforms to
svr4, 4.3bsd, c89.
.sh see also
.br asin (3),
.br atan (3),
.br atan2 (3),
.br cacos (3),
.br cos (3),