Open System Services Library Calls Reference Manual (G06.29+, H06.08+, J06.03+)

OSS Library Calls (t - v) tanhl(3)
NAME
tanhl - Computes the hyperbolic tangent function for a long double value
LIBRARY
H-series and J-series native Guardian processes: $SYSTEM.ZDLLnnn.ZCREDLL
32-bit H-series and J-series OSS processes: /G/system/zdllnnn/zcredll
64-bit H-series and J-series OSS processes: /G/system/zdllnnn/ycredll
SYNOPSIS
#include <math.h>
long double tanhl(
long double x);
PARAMETERS
x Is the long double value for which the hyperbolic tangent function is to be com-
puted.
DESCRIPTION
The tanhl( ) function is a long double version of the tanh( ) function; it takes a long double argu-
ment and returns a long double result.
The tanhl( ) function computes the hyperbolic tangent of x.
NOTES
This function supports both IEEE Std 754-1985 floating-point and Tandem floating-point values
in the native environment. IEEE values can include NaN and infinity, and the sign of 0.0 (zero)
can be either positive or negative. Refer to the fp_class(3) reference page for a description of
IEEE value classes.
Guardian functions are available to convert between floating-point formats. Refer to the Guar-
dian Programmer’s Guide for a discussion of floating-point conversions.
RETURN VALUES
The tanhl( ) function returns the hyperbolic tangent of its parameter.
For IEEE floating-point values, if the value of x is NaN, NaN is returned.
If the result would cause an underflow, 0.0 (zero) is returned.
ERRORS
No errors are returned. This function does not set errno.
RELATED INFORMATION
Functions: cos(3), cosh(3), fp_class(3), isnan(3), sin(3), sinh(3), tan(3), tanh(3), tanhf(3).
STANDARDS CONFORMANCE
This function conforms to the ISO/IEC 9899:1999 standard.
This function conforms to the IEEE Std 1003.1, 2004 Edition.
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