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SQRT(3)			   Linux Programmer's Manual		       SQRT(3)

NAME
       sqrt, sqrtf, sqrtl - square root	function

SYNOPSIS
       #include	<math.h>

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

       Link with -lm.

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

       sqrtf(),	sqrtl():
	   _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE	>= 600 ||
	   _ISOC99_SOURCE || _POSIX_C_SOURCE >=	200112L;
	   or cc -std=c99

DESCRIPTION
       The sqrt() function returns 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.

CONFORMING TO
       C99, POSIX.1-2001.  The variant returning double	also conforms to SVr4,
       4.3BSD, C89.

SEE ALSO
       cbrt(3),	csqrt(3), hypot(3)

COLOPHON
       This  page  is  part of release 3.74 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest	  version     of     this    page,    can    be	   found    at
       http://www.kernel.org/doc/man-pages/.

				  2010-09-20			       SQRT(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON

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