NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

ATTRIBUTES

CONFORMING TO

SEE ALSO

COLOPHON

## NAME

## SYNOPSIS

## DESCRIPTION

## RETURN VALUE

## ERRORS

## ATTRIBUTES

## CONFORMING TO

## SEE ALSO

## COLOPHON

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

ATTRIBUTES

CONFORMING TO

SEE ALSO

COLOPHON

hypot, hypotf, hypotl − Euclidean distance function

**#include
<math.h>**

**double
hypot(double** *x***, double** *y***);
float hypotf(float**

long double hypotl(long double

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*

These functions
return 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.

For an
explanation of the terms used in this section, see
**attributes**(7).

C99, POSIX.1-2001, POSIX.1-2008.

The variant
returning *double* also conforms to SVr4, 4.3BSD.

**cabs**(3),
**sqrt**(3)

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