mirror of https://github.com/mkerrisk/man-pages
SYNOPSIS: Added feature test macro requirements.
RETURN VALUE: Added details for special argument cases. Rewrote ERRORS section. Updated CONFORMING TO.
This commit is contained in:
parent
d27e22f5b0
commit
e279ffc370
74
man3/acos.3
74
man3/acos.3
|
@ -1,4 +1,6 @@
|
||||||
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
|
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
|
||||||
|
.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
|
||||||
|
.\" <mtk.manpages@gmail.com>
|
||||||
.\"
|
.\"
|
||||||
.\" Permission is granted to make and distribute verbatim copies of this
|
.\" Permission is granted to make and distribute verbatim copies of this
|
||||||
.\" manual provided the copyright notice and this permission notice are
|
.\" manual provided the copyright notice and this permission notice are
|
||||||
|
@ -28,7 +30,7 @@
|
||||||
.\" Modified 2002-07-25 by Walter Harms
|
.\" Modified 2002-07-25 by Walter Harms
|
||||||
.\" (walter.harms@informatik.uni-oldenburg.de)
|
.\" (walter.harms@informatik.uni-oldenburg.de)
|
||||||
.\"
|
.\"
|
||||||
.TH ACOS 3 2004-10-06 "" "Linux Programmer's Manual"
|
.TH ACOS 3 2008-07-29 "" "Linux Programmer's Manual"
|
||||||
.SH NAME
|
.SH NAME
|
||||||
acos, acosf, acosl \- arc cosine function
|
acos, acosf, acosl \- arc cosine function
|
||||||
.SH SYNOPSIS
|
.SH SYNOPSIS
|
||||||
|
@ -41,31 +43,69 @@ acos, acosf, acosl \- arc cosine function
|
||||||
.fi
|
.fi
|
||||||
.sp
|
.sp
|
||||||
Link with \fI\-lm\fP.
|
Link with \fI\-lm\fP.
|
||||||
|
.sp
|
||||||
|
.in -4n
|
||||||
|
Feature Test Macro Requirements for glibc (see
|
||||||
|
.BR feature_test_macros (7)):
|
||||||
|
.in
|
||||||
|
.sp
|
||||||
|
.ad l
|
||||||
|
.BR acosf (),
|
||||||
|
.BR acosl ():
|
||||||
|
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
|
||||||
|
.I cc\ -std=c99
|
||||||
|
.ad b
|
||||||
.SH DESCRIPTION
|
.SH DESCRIPTION
|
||||||
The
|
The
|
||||||
.BR acos ()
|
.BR acos ()
|
||||||
function calculates the arc cosine of \fIx\fP; that is
|
function calculates the arc cosine of \fIx\fP; that is
|
||||||
the value whose cosine is \fIx\fP.
|
the value whose cosine is \fIx\fP.
|
||||||
If \fIx\fP falls outside the range
|
|
||||||
\-1 to 1,
|
|
||||||
.BR acos ()
|
|
||||||
fails and \fIerrno\fP is set.
|
|
||||||
.SH "RETURN VALUE"
|
.SH "RETURN VALUE"
|
||||||
The
|
On success, these functions return the arc cosine of
|
||||||
.BR acos ()
|
.IR x
|
||||||
function returns the arc cosine in radians and the
|
in radians; the return value is in the range [0,\ pi].
|
||||||
value is mathematically defined to be between 0 and PI (inclusive).
|
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is a NaN, a NaN is returned.
|
||||||
|
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is +1,
|
||||||
|
+0 is returned.
|
||||||
|
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is positive infinity or negative infinity,
|
||||||
|
a "domain error" occurs,
|
||||||
|
and a NaN is returned.
|
||||||
|
|
||||||
|
If
|
||||||
|
.I x
|
||||||
|
is outside the range [\-1,\ 1],
|
||||||
|
a "domain error" occurs,
|
||||||
|
and a NaN is returned.
|
||||||
.SH ERRORS
|
.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
|
.TP
|
||||||
.B EDOM
|
Domain error: \fIx\fP is outside the range [\-1,\ 1]
|
||||||
\fIx\fP is out of range.
|
.I errno
|
||||||
|
is set to
|
||||||
|
.BR EDOM .
|
||||||
|
An invalid floating-point exception
|
||||||
|
.RB ( FE_INVALID )
|
||||||
|
is raised.
|
||||||
.SH "CONFORMING TO"
|
.SH "CONFORMING TO"
|
||||||
SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
|
C99, POSIX.1-2001.
|
||||||
The
|
The variant returning
|
||||||
.I float
|
.I double
|
||||||
and
|
also conforms to
|
||||||
.I "long double"
|
SVr4, 4.3BSD, C89.
|
||||||
variants are C99 requirements.
|
|
||||||
.SH "SEE ALSO"
|
.SH "SEE ALSO"
|
||||||
.BR asin (3),
|
.BR asin (3),
|
||||||
.BR atan (3),
|
.BR atan (3),
|
||||||
|
|
Loading…
Reference in New Issue