NAME
sqrt(), sqrtf(), sqrtl(), sqrtw(), sqrtq() — square root functions
SYNOPSIS
#include <math.h>
double sqrt(double x);
float sqrtf(float x);
HP Integrity Server Only
long double sqrtl(long double x);
extended sqrtw(extended x);
quad sqrtq(quad x);
DESCRIPTION
sqrt()
returns the non-negative square root of
x.
sqrtf()
is a
float
version of
sqrt();
it takes a
float
argument and returns a
float
result.
Integrity Server Only
sqrtl()
is a
long double
version of
sqrt();
it takes a
long double
argument and returns a
long double
result.
sqrtw()
is an
extended
version of
sqrt();
it takes an
extended
argument and returns an
extended
result.
sqrtq()
is equivalent to
sqrtl()
on HP-UX systems.
USAGE
To use these functions compile either with the default
-Ae
option or with the
-Aa
and the
-D_HPUX_SOURCE
options.
To use (for Integrity servers)
sqrtw()
or
sqrtq(),
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
If
x
is +INFINITY,
sqrt()
returns +INFINITY.
If
x
is NaN,
sqrt()
returns NaN.
If
x
is less than zero,
sqrt()
returns NaN and raises the invalid floating-point exception.
sqrt()
raises the inexact exception whenever a rounded result does not equal
the mathematical result.
ERRORS
If
x
is less than zero,
sqrt()
sets
errno
to [EDOM].
Integrity Server Only
HP-UX
libm
functions on Integrity servers do not set
errno
by default. For
errno
setting, compile with the
+Olibmerrno
option and the (default)
+Olibcalls
option.
STANDARDS CONFORMANCE
sqrt()
: SVID3, XPG4.2, ANSI C, ISO/IEC C99
(including Annex F, ``IEC 60559 floating-point arithmetic'')
sqrtf(),
sqrtl()
: ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')
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