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

OSS Library Calls (a - d) cbrt(3)
NAME
cbrt - Computes the cube root of a floating-point number
LIBRARY
G-series native Guardian processes: $SYSTEM.SYSnn.ZCRESRL
G-series native OSS processes: /G/system/sysnn/zcresrl
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>
double cbrt(
double x);
PARAMETERS
x Is the value whose cube root is to be computed.
DESCRIPTION
The cbrt( ) function calculates the cube root of x.
The cbrt( ) function can be called only by native processes.
NOTES
This function supports both IEEE Std 754-1985 floating-point and Tandem floating-point values.
IEEE values can include NaN and infinity, and the sign of 0 (zero) can be either positive or nega-
tive. 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 cbrt( ) function returns the cube root of the x parameter.
For IEEE floating-point values, if the value of x is NaN, the cbrt( ) function returns NaN. If the
value of x is positive infinity, the cbrt( ) function returns positive infinity. If the value of x is
negative infinity, the cbrt( ) function returns negative infinity.
ERRORS
The cbrt( ) function does not set errno.
RELATED INFORMATION
Functions: fp_class(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, this function does not set errno to [EDOM] if the value of
x is NaN.
527187-017 Hewlett-Packard Company 1−91