tanh(3p) — Справочная страница Linux

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

ПРЕДИСЛОВИЕ

       This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

ИМЯ

       tanh, tanhf, tanhl — hyperbolic tangent functions

СИНТАКСИС

       #include <math.h>

       double tanh(double x);
       float tanhf(float x);
       long double tanhl(long double x);

ОПИСАНИЕ

       The functionality described on this reference page is aligned
       with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This
       volume of POSIX.1‐2017 defers to the ISO C standard.

       These functions shall compute the hyperbolic tangent of their
       argument x.

       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.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       Upon successful completion, these functions shall return the
       hyperbolic tangent of x.

       If x is NaN, a NaN shall be returned.

       If x is ±0, x shall be returned.

       If x is ±Inf, ±1 shall be returned.

       If x is subnormal, a range error may occur
       and x should be returned.

       If x is not returned, tanh(), tanhf(), and tanhl() shall return
       an implementation-defined value no greater in magnitude than
       DBL_MIN, FLT_MIN, and LDBL_MIN, respectively.

ОШИБКИ

       These functions may fail if:

       Range Error The value of x is subnormal.

                   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.

ПРИМЕРЫ

       None.

ИСПОЛЬЗОВАНИЕ В ПРИЛОЖЕНИЯХ

       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.

ОБЪЯСНЕНИЕ

       None.

ПЕРСПЕКТИВЫ РАЗВИТИЯ

       None.

СМОТРИТЕ ТАКЖЕ

       atanh(3p), feclearexcept(3p), fetestexcept(3p), isnan(3p),
       tan(3p)

       The Base Definitions volume of POSIX.1‐2017, Section 4.20,
       Treatment of Error Conditions for Mathematical Functions,
       math.h(0p)

АВТОРСКИЕ ПРАВА

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 .

       Any typographical or formatting errors that appear in this page
       are most likely to have been introduced during the conversion of
       the source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                          TANH(3P)

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