HP-UX Reference (11i v1 05/09) - 3 Library Functions N-Z (vol 7)

sqrt(3M) sqrt(3M)

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 speci-

fying -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.