Man page - sqrtl(3)

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Manual

sqrt

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

NAME

sqrt, sqrtf, sqrtl - square root function

LIBRARY

Math library ( libm , -lm )

SYNOPSIS

#include <math.h>

double sqrt(double x );
float sqrtf(float x );
long double sqrtl(long double x );

Feature Test Macro Requirements for glibc (see feature_test_macros (7)):

sqrtf (), sqrtl ():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

These functions return 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.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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STANDARDS

C11, POSIX.1-2008.

HISTORY

C99, POSIX.1-2001.

The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

cbrt (3), csqrt (3), hypot (3)