SQRT
Section: Linux Programmer's Manual (3)
Updated: 20100920
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NAME
sqrt, sqrtf, sqrtl  square root function
SYNOPSIS
#include <math.h>
double sqrt(double x);
float sqrtf(float x);
long double sqrtl(long double x);
Link with lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
sqrtf(),
sqrtl():

_BSD_SOURCE  _SVID_SOURCE  _XOPEN_SOURCE >= 600  _ISOC99_SOURCE 
_POSIX_C_SOURCE >= 200112L;
or
cc std=c99
DESCRIPTION
The
sqrt()
function returns the nonnegative square root of
x.
RETURN VALUE
On success, these functions return the square root of
x.
If
x
is a NaN, a NaN is returned.
If
x
is +0 (0), +0 (0) is returned.
If
x
is positive infinity, positive infinity is returned.
If
x
is less than 0,
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 less than 0

errno
is set to
EDOM.
An invalid floatingpoint exception
(FE_INVALID)
is raised.
CONFORMING TO
C99, POSIX.12001.
The variant returning
double
also conforms to
SVr4, 4.3BSD, C89.
SEE ALSO
cbrt(3),
csqrt(3),
hypot(3)
COLOPHON
This page is part of release 3.54 of the Linux
manpages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/manpages/.
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 RETURN VALUE

 ERRORS

 CONFORMING TO

 SEE ALSO

 COLOPHON

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Time: 00:06:16 GMT, January 23, 2018