Guardian Native C Library Calls Reference Manual (G06.29+, H06.08+, J06.03+)

tanhf(3) Guardian Native C Library Calls Reference Manual
NAME
tanhf - Computes the hyperbolic tangent function for a float 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>
float tanhf(
float x);
PARAMETERS
x Is the float value for which the hyperbolic tangent function is to be computed.
DESCRIPTION
The tanhf( ) function is a float version of the tanh( ) function; it takes a float argument and
returns a float result.
The tanhf( ) 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 tanhf( ) 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), tanhl(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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