tanhf(3) [posix man page]

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

NAME

       tanh, tanhf, tanhl - hyperbolic tangent functions

SYNOPSIS

       #include <math.h>

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

DESCRIPTION

       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.

RETURN VALUE

       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.

ERRORS

       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.

EXAMPLES

       None.

APPLICATION USAGE

       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

       atanh() , feclearexcept() , fetestexcept() , isnan() , tan() , 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								   TANH(P)

SINH(P) 						     POSIX Programmer's Manual							   SINH(P)

NAME

       sinh, sinhf, sinhl - hyperbolic sine functions

SYNOPSIS

       #include <math.h>

       double sinh(double x);
       float sinhf(float x);
       long double sinhl(long double x);

DESCRIPTION

       These functions shall compute the hyperbolic sine 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.

RETURN VALUE

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

       If  the	result	would  cause an overflow, a range error shall occur and +-HUGE_VAL, +-HUGE_VALF, and +-HUGE_VALL (with the same sign as x)
       shall be returned as appropriate for the type of the function.

       If x is NaN, a NaN shall be returned.

       If x is +-0 or +-Inf, x shall be returned.

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

ERRORS

       These functions shall fail if:

       Range Error
	      The result would cause an overflow.

       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 value 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.

EXAMPLES

       None.

APPLICATION USAGE

       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

       asinh() , cosh() , feclearexcept() , fetestexcept() , isnan() , tanh() , 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								   SINH(P)