Jump to content United States-English
HP.com Home Products and Services Support and Drivers Solutions How to Buy
» Contact HP
More options
HP.com home
HP-UX Reference > S


HP-UX 11i Version 3: February 2007

Technical documentation

» Feedback
Content starts here

 » Table of Contents

 » Index


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


#include <math.h>

double sqrt(double x);

float sqrtf(float x);

HP Integrity Server Only

long double sqrtl(long double x);

extended sqrtw(extended x);

quad sqrtq(quad x);


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.

Integrity Server 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.


To use these functions compile either with the default -Ae option or with the -Aa and the -D_HPUX_SOURCE options.

To use (for Integrity servers) 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 for HP Integrity servers at the following site: http://www.hp.com/go/fp.


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.


If x is less than zero, sqrt() sets errno to [EDOM].

Integrity Server Only

HP-UX libm functions on Integrity servers do not set errno by default. For errno setting, compile with the +Olibmerrno option and the (default) +Olibcalls option.


sqrt() : SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

sqrtf(), sqrtl() : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

Printable version
Privacy statement Using this site means you accept its terms Feedback to webmaster
© 1983-2007 Hewlett-Packard Development Company, L.P.