|HYPOT(3)||Library Functions Manual||HYPOT(3)|
x, double y);
x, float y);
double x, long double
double complex z);
hypotl() functions compute the sqrt(x*x+y*y) in such a way that underflow will not happen, and overflow occurs only if the final result deserves it.
infinity) = +infinity for all
v, including NaN.
functions return the absolute value of the complex number
hypot(5.0, 12.0) = 13.0 exactly; in general, hypot and cabs return an integer whenever an integer might be expected.
hypot(v, NaN) and
hypot(NaN, v) are NaN for all finite v. Programmers might be surprised at first to discover that
hypot(±infinity, NaN) = +infinity. This is intentional; it happens because
hypot(infinity, v) = +infinity for all v, finite or infinite. Hence
hypot(infinity, v) is independent of v. The IEEE NaN is designed to disappear when it turns out to be irrelevant, as it does in
hypot() function first appeared in Version 3 AT&T UNIX, and
cabs() in Version 7 AT&T UNIX.
|April 27, 2016||OpenBSD-current|