| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON | The Linux Programming Interface |
HYPOT(3) Linux Programmer's Manual HYPOT(3)
hypot, hypotf, hypotl - Euclidean distance function
#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 ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
hypotf(), hypotl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99
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.
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.
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.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4,
4.3BSD.
cabs(3), sqrt(3)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
2010-09-20 HYPOT(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface