hypot, hypotf, hypotl — Euclidean distance function
||long double x,|
|long double y
These functions return sqrt(
y). This is the length of the
hypotenuse of a right-angled triangle with sides of length
y, or the distance of the point
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
y is an infinity, positive
infinity is returned.
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
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:
errno is set to
ERANGE. An overflow
floating-point exception (
FE_OVERFLOW) is raised.
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.
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Copyright 1993 David Metcalfe (davidprism.demon.co.uk)
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Linux libc source code
Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
386BSD man pages
Modified 1993-07-24 by Rik Faith (faithcs.unc.edu)
Modified 2002-07-27 by Walter Harms