Linux manual pages Section 3: Subroutines  

Name

asin, asinf, asinl — arc sine function

Synopsis

#include <math.h>
double asin( double x);
 
float asinf( float x);
 
long double asinl( long double x);
 
[Note] Note
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
asinf(), asinl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
[Note] Note

Link with −lm.

DESCRIPTION

The asin() function calculates the principal value of the arc sine of x; that is the value whose sine is x.

RETURN VALUE

On success, these functions return the principal value of the arc sine of x in radians; the return value is in the range [−pi/2, pi/2].

If x is a NaN, a NaN is returned.

If x is +0 (−0), +0 (−0) is returned.

If x is outside the range [−1, 1], a domain error occurs, and a NaN is returned.

ERRORS

See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

The following errors can occur:

Domain error: x is outside the range [−1, 1]

errno is set to EDOM. An invalid floating-point exception (FE_INVALID) is raised.

CONFORMING TO

C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

acos(3), atan(3), atan2(3), casin(3), cos(3), sin(3), tan(3)

COLOPHON

This page is part of release 3.52 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man−pages/.


  Copyright 1993 David Metcalfe (davidprism.demon.co.uk)
and Copyright 2008, Linux Foundation, written by Michael Kerrisk
    <mtk.manpagesgmail.com>

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References consulted:
    Linux libc source code
    Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
    386BSD man pages
Modified 1993-07-24 by Rik Faith (faithcs.unc.edu)
Modified 2002-07-25 by Walter Harms
(walter.harmsinformatik.uni-oldenburg.de)