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hypotl(3m) [opensolaris man page]

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

NAME
hypot, hypotf, hypotl - Euclidean distance function SYNOPSIS
c99 [ 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 x^2 + y^2 without 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 x^2 and y^2. 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 5.11 1 Sep 2002 hypot(3M)

Check Out this Related Man Page

HYPOT(3P)						     POSIX Programmer's Manual							 HYPOT(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
hypot, hypotf, hypotl - Euclidean distance function SYNOPSIS
#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 shall compute the value of the square root of x**2+ y**2 without undue overflow or underflow. An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is non-zero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred. RETURN VALUE
Upon successful completion, these functions shall return the length of the hypotenuse of a right-angled triangle with sides of length x and y. If the correct value would cause overflow, a range error shall occur and hypot(), hypotf(), and hypotl() shall return the value of the macro HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively. If x or y is +-Inf, +Inf shall be returned (even if one of x or y is NaN). If x or y is NaN, and the other is not +-Inf, a NaN shall be returned. If both arguments are subnormal and the correct result is subnormal, a range error may occur and the correct result is returned. ERRORS
These functions shall fail if: Range Error The result overflows. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow floating-point exception shall be raised. These functions may fail if: Range Error The result underflows. If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the underflow floating-point exception shall be raised. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
hypot(x,y), hypot(y,x), and hypot(x, -y) are equivalent. hypot(x, +-0) is equivalent to fabs(x). Underflow only happens when both x and y are subnormal and the (inexact) result is also subnormal. These functions take precautions against overflow during intermediate steps of the computation. On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
feclearexcept(), fetestexcept(), isnan(), sqrt(), the Base Definitions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Conditions for Mathematical Functions, <math.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 HYPOT(3P)
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