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

tanl(3) OSS Library Calls Reference Manual
NAME
tanl - Computes the trigonometric 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 tanl(
long double x);
PARAMETERS
x Is the long double value for which the trigonometric tangent function is to be
computed.
DESCRIPTION
The tanl( ) function is a long double version of the tan( ) function; it takes a long double argu-
ment and returns a long double result.
The tanl( ) function computes the tangent of x, measured in radians.
NOTES
The tanl( ) function loses accuracy when passed a large value for the x parameter.
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 tanl( ) function returns the tangent 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 or negative infinity, NaN is returned and errno is set to [EDOM].
If the correct value would cause underflow, 0.0 (zero) is returned.
ERRORS
If any of the following conditions occurs, the tanl( ) function sets errno to the corresponding
value:
[EDOM] The value of x is infinite.
RELATED INFORMATION
Functions: acos(3), acosh(3), asin(3), asinh(3), atan(3), atan2(3), atanh(3), cos(3), cosh(3),
fp_class(3), isnan(3), sin(3), sinh(3), tan(3), tanf(3), tanh(3).
Files: float(4), math(4).
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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