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#include <math.h> double hypot(double x, double y); |
This function computes sqrt(x*x + y*y),
the length of a hypotenuse of a right triangle whose shorter sides are
x and y. In other words, it computes the Euclidean distance
between the points (0,0) and (x,y). Since the
computation is done in extended precision, there is no danger of
overflow or underflow when squaring the arguments, whereas direct
computation of sqrt(x*x + y*y) could
cause overflow or underflow for extreme (very large or very small)
values of x and y.
The value of sqrt(x*x + y*y). If both
arguments are finite, but the result is so large that it would overflow
a double, the return value is Inf, and errno is set
to ERANGE. If one of the arguments is Inf, the return
value is Inf and the value of errno is left unchanged. If
one of the arguments is NaN, the return value is NaN and
errno is set to EDOM.
| ANSI/ISO C | No |
| POSIX | No |