HP-UX Reference (11i v2 03/08) - 3 Library Functions N-Z (vol 7)

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sqrt(3M) sqrt(3M)

NAME

sqrt(), sqrtf( ), sqrtl( ), sqrtw( ), sqrtq( ) - square root functions

SYNOPSIS

#include <math.h>

double sqrt(double x);

float sqrtf(float x);

Itanium(R)-based System Only

long double sqrtl(long double x);

extended sqrtw(extended x);

quad sqrtq(quad x);

DESCRIPTION

sqrt() returns the non-negative square root of x.

sqrtf() is a float version of sqrt(); it takes a

float argument and returns a float result.

Itanium-based System Only

sqrtl() is a long double version of sqrt(); it takes a long double argument and returns a

long double result.

sqrtw() is an extended version of sqrt(); it takes an extended argument and returns an

extended result.

sqrtq() is equivalent to sqrtl() on HP-UX systems.

USAGE

To use these functions compile either with the default

-Ae option or with the -Aa

and the

-D_HPUX_SOURCE options.

To use (for Itanium-based systems)

sqrtw() or sqrtq(), compile also with the -fpwidetypes

option.

To use any of 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.

For more information, see the HP-UX Floating-Point Guide.

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 raises the invalid ﬂoating-point exception.

sqrt() raises the inexact exception whenever a rounded result does not equal the mathematical result.

ERRORS

If x is less than zero,

sqrt() sets errno to [EDOM].

Itanium-based System Only

HP-UX

libm functions on Itanium-based systems do not set errno by default. For errno setting, com-

pile with the +Olibmerrno option and the (default) +Olibcalls option.