|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,
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; with "reserved operand" in place of "NaN", the same is true on a VAX. But programmers on machines other than a VAX (it has no infinity) 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. Unlike the reserved operand fault on a VAX, 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.
|July 17, 2013||OpenBSD-5.6|