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

NAME
       hypot, hypotf, hypotl - Euclidean distance function

SYNOPSIS
       #include <math.h>

       double hypot(double x, double y);
       float hypotf(float x, float y);
       long double hypotl(long double x, long double y);

       Link with -lm.

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

       hypot(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE; or cc -std=c99
       hypotf(), hypotl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE;
       or cc -std=c99

DESCRIPTION
       The hypot() function returns sqrt(x*x+y*y).  This is the length of  the	hypotenuse  of	a
       right-angled  triangle  with  sides  of length x and y, or the distance of the point (x,y)
       from the origin.

       The calculation is performed without undue overflow or underflow during	the  intermediate
       steps of the calculation.

RETURN VALUE
       On  success,  these  functions  return the length of a right-angled triangle with sides of
       length x and y.

       If x or y is an infinity, positive infinity is returned.

       If x or y is a NaN, and the other argument is not an infinity, a NaN is returned.

       If the result overflows,  a  range  error  occurs,  and	the  functions	return	HUGE_VAL,
       HUGE_VALF, or HUGE_VALL, respectively.

       If  both  arguments  are subnormal, and the result is subnormal, a range error occurs, and
       the correct result 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:

       Range error: result overflow
	      errno  is  set  to  ERANGE.   An overflow floating-point exception (FE_OVERFLOW) is
	      raised.

       Range error: result underflow
	      An underflow floating-point exception (FE_UNDERFLOW) is raised.

	      These functions do not set errno for this case.

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

SEE ALSO
       cabs(3), sqrt(3)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A  description  of  the
       project,   and	information  about  reporting  bugs,  can  be  found  at  http://www.ker-
       nel.org/doc/man-pages/.

					    2008-08-05					 HYPOT(3)
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