# cabs(3m) [bsd man page]

```HYPOT(3M)																 HYPOT(3M)

NAME
hypot, cabs - Euclidean distance, complex absolute value

SYNOPSIS
#include <math.h>

double hypot(x,y)
double x,y;

double cabs(z)
struct {double x,y;} z;

DESCRIPTION
Hypot(x,y)  and cabs(x,y) return sqrt(x*x+y*y) computed in such a way that underflow will not happen, and overflow occurs only if the final
result deserves it.

hypot(infinity,v) = hypot(v,infinity) = +infinity for all v, including NaN.

ERROR (due to Roundoff, etc.)
Below 0.97 ulps.  Consequently hypot(5.0,12.0) = 13.0 exactly; in general, hypot and cabs return an integer whenever an	integer  might	be
expected.

The  same  cannot  be  said  for the shorter and faster version of hypot and cabs that is provided in the comments in cabs.c; its error can
exceed 1.2 ulps.

NOTES
As 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(+-infin-
ity,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 on a VAX, the IEEE NaN is designed to disappear when it turns out to be
irrelevant, as it does in hypot(infinity,NaN).

math(3M), sqrt(3M)

AUTHOR
W. Kahan

4th Berkeley Distribution					   May 12, 1986 							 HYPOT(3M)```

## Check Out this Related Man Page

```HYPOT(3)						   BSD Library Functions Manual 						  HYPOT(3)

NAME
hypot, hypotf -- Euclidean distance and complex absolute value functions

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
hypot(double x, double y);

float
hypotf(float x, float y);

DESCRIPTION
The hypot() 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.

hypot(infinity, v) = hypot(v, infinity) = +infinity for all v, including NaN.

ERRORS
Below 0.97 ulps.  Consequently hypot(5.0, 12.0) = 13.0 exactly; in general, hypot returns an integer whenever an integer might be expected.

The same cannot be said for the shorter and faster version of hypot that is provided in the comments in cabs.c; its error can exceed 1.2
ulps.

NOTES
As 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(infinity, NaN).

math(3), sqrt(3)

HISTORY
Both a hypot() function and a cabs() function appeared in Version 7 AT&T UNIX.  cabs() was removed from public namespace in NetBSD 5.0 to
avoid conflicts with the complex function in C99.

BSD								 February 12, 2007							       BSD```
Man Page

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