Manual Reference Pages - SQRT (3)
NAME
sqrt, sqrtf, sqrtl - square root function
CONTENTS
Synopsis
Description
Errors
Colophon
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 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
cbrt (3),
csqrt (3),
hypot (3)
COLOPHON
This page is part of release 3.44 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 /.

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