sunos man page for hypot

hypot(3M)						  Mathematical Library Functions						 hypot(3M)

NAME
       hypot, hypotf, hypotl - Euclidean distance function

SYNOPSIS
       cc [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double hypot(double x, double y);

       float hypotf(float x, float y);

       long double hypotl(long double x, long double y);

DESCRIPTION
       These functions compute the length of the square root of x2+ y2without undue overflow or underflow.

RETURN VALUES
       Upon  successful completion, these functions return the length of the hypotenuse of a right angled triangle with sides of length x2and y2PP
       If the correct value would cause overflow, a range error occurs and hypot(), hypotf(), and hypotl() return the value of the macro HUGE_VAL,
       HUGE_VALF, and HUGE_VALL, respectively.

       If x or y is +-Inf, +Inf is returned even if one of x or y is NaN.

       If x or y is NaN and the other is not +-Inf, a NaN is returned.

ERRORS
       These functions will fail if:

       Range Error     The result overflows.

		       If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the overflow floating-point exception is raised.

USAGE
       hypot(x,y), hypot(y,x), and hypot(x, -y) are equivalent.

       hypot(x, +-0) is equivalent to fabs(x).

       These functions takes precautions against underflow and overflow during intermediate steps of the computation.

       An  application	wanting  to  check  for  exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception  has  been  raised.  An  application  should
       either examine the return value or check the floating point exception flags to detect exceptions.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       fabs(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), sqrt(3M), attributes(5), standards(5)

SunOS 5.10							    1 Sep 2002								 hypot(3M)