hypot(3) - Linux manual page (original) (raw)
hypot(3) Library Functions Manual hypot(3)
NAME top
hypot, hypotf, hypotl - Euclidean distance functionLIBRARY top
Math library (_libm_, _-lm_)SYNOPSIS top
**#include <math.h>**
**double hypot(double** _x_**, double** _y_**);**
**float hypotf(float** _x_**, float** _y_**);**
**long double hypotl(long double** _x_**, long double** _y_**);**Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
**hypot**():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| _XOPEN_SOURCE
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
**hypotf**(), **hypotl**():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEDESCRIPTION top
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.RETURN VALUE top
On success, these functions return the length of the hypotenuse 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 top
See [math_error(7)](../man7/math%5Ferror.7.html) 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](../man3/errno.3.html)_ 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](../man3/errno.3.html)_ for this case.ATTRIBUTES top
For an explanation of the terms used in this section, see
[attributes(7)](../man7/attributes.7.html).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ **Interface** │ **Attribute** │ **Value** │
├──────────────────────────────────────┼───────────────┼─────────┤
│ **hypot**(), **hypotf**(), **hypotl**() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘STANDARDS top
C11, POSIX.1-2008.HISTORY top
C99, POSIX.1-2001.
The variant returning _double_ also conforms to SVr4, 4.3BSD.SEE ALSO top
[cabs(3)](../man3/cabs.3.html), [sqrt(3)](../man3/sqrt.3.html)COLOPHON top
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man-pages@man7.orgLinux man-pages 6.10 2024-07-23 hypot(3)
Pages that refer to this page:cabs(3), sqrt(3)