NAME
sqrt(), sqrtf() — square root functions
SYNOPSIS
#include <math.h>
double sqrt(double x);
float sqrtf(float x);
DESCRIPTION
sqrt()
returns the non-negative square root of
x.
The value of
x
must not be less than zero.
sqrtf()
is a
float
version of
sqrt();
it takes a
float
argument and returns a
float
result.
To use this function, compile either with the default
-Ae
option or with the
-Aa
and
-D_HPUX_SOURCE
options.
sqrtf()
is not specified by any standard, but
it is named in accordance with the conventions
specified in the "Future Library Directions" section of the
ANSI C standard.
To use 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.
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 sets
errno
to [EDOM].
ERRORS
If
sqrt()
fails,
errno
is set to the following value.
- [EDOM]
x
is less than zero.
STANDARDS CONFORMANCE
sqrt(): SVID3, XPG4.2, ANSI C
