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acosh.3m (2010 09)

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acosh(3M) acosh(3M)
NAME
acosh( ), acoshf( ), acoshl( ), acoshw( ), acoshq( ) - arc hyperbolic cosine functions
SYNOPSIS
#include <math.h>
double acosh(double x);
HP Integrity Server Only
float acoshf(float x);
long double acoshl(long double x);
extended acoshw(extended x);
quad acoshq(quad x);
DESCRIPTION
acosh() returns the arc hyperbolic cosine of x, in the range +zero to +INFINITY.
Integrity Server Only
acoshf() is a float version of acosh(); it takes a
float argument and returns a float result.
acoshl() is a long double version of acosh(); it takes a long double argument and returns a
long double result.
acoshw() is an extended version of acosh(); it takes an extended argument and returns an
extended result.
acoshq() is equivalent to acoshl() on HP-UX systems.
USAGE
To use (for Integrity servers)
acoshf(), acoshl(), acoshw(),oracoshq(), compile either with the
default -Ae option or with the -Aa and -D_HPUX_SOURCE
options.
To use (for Integrity servers)
acoshw() or acoshq(), compile also with the -fpwidetypes option.
To use any of these functions, make sure your program includes
<math.h>, and link in the math library
by specifying -lm on the compiler or linker command line.
For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site:
http://www.hp.com/go/fp
.
RETURN VALUE
acosh() returns +0.
If x < 1.0,
acosh() returns NaN and raises the invalid exception.
If x is +INFINITY,
acosh() returns +INFINITY.
If x is NaN,
acosh() returns NaN.
When it raises no other exception, whether
acosh() raises the inexact exception is unspecified.
ERRORS
If x < 1.0,
acosh() sets errno to [EDOM].
Integrity Server Only
HPUX
libm functions on Integrity servers do not set errno by default. For errno setting, compile
with the +Olibmerrno option.
SEE ALSO
asinh(3M), atanh(3M), cacosh(3M), cosh(3M), math(5).
STANDARDS CONFORMANCE
acosh(), acoshf(), acoshl() : ISO/IEC C99 (including Annex F, ‘‘IEC 60559 floating-point arith-
metic’’)
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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