Guardian Native C Library Calls Reference Manual (G06.28+, H06.04+)

sinh(3) Guardian Native C Library Calls Reference Manual
NAME
sinh - Computes the hyperbolic sine function
LIBRARY
G-series native Guardian processes: $SYSTEM.SYSnn.ZCRESRL
G-series native OSS processes: /G/system/sysnn/zcresrl
H-series native Guardian processes: $SYSTEM.ZDLLnnn.ZCREDLL
H-series OSS processes: /G/system/zdllnnn/zcredll
SYNOPSIS
#include <math.h>
double sinh(
double x);
PARAMETERS
x Is the value for which the hyperbolic sine function is to be computed.
DESCRIPTION
The sinh( ) function computes the hyperbolic sine 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 sinh( ) function returns the hyperbolic sine of its parameter.
For IEEE floating-point values, if the value of x is NaN, NaN is returned. If the value of x is
positive infinity, positive infinity is returned. If the value of x is negative infinity, negative
infinity is returned.
If the result would cause overflow, positive or negative HUGE_VAL is returned (depending on
the sign of the value of x) and errno is set to [ERANGE]. If the result would cause underflow,
0.0 (zero) is returned.
ERRORS
If any of the following conditions occurs, the sinh( ) function sets errno to the corresponding
value:
[ERANGE] The result would cause an overflow.
RELATED INFORMATION
Functions: cos(3), cosh(3), fp_class(3), isnan(3), sin(3), tan(3), tanh(3).
STANDARDS CONFORMANCE
The XPG4 Version 2 specification leaves some features to the implementing vendor to define.
The following features are affected in the HP implementation:
• For IEEE floating-point data, errno is not set to [EDOM] when the value of x is NaN.
6−28 Hewlett-Packard Company 527192-005