HP-UX Floating-Point Guide

118 Chapter 4

HP-UX Math Libraries on HP 9000 Systems

Contents of the HP-UX Math Libraries

Other macros that test the class of a ﬂoating-point value are

• isinf, which tests whether a value is an inﬁnity

• isnan, which tests whether a value is a NaN

• isfinite, which tests whether a value is neither inﬁnity nor NaN

• isnormal, which tests whether a value is normalized

See the online man pages for information about these macros.

COSE Common API Functions

The C math library provides several functions that are not speciﬁed by

the ANSI C standard but that are required by the COSE Common API

Speciﬁcation (Spec 1170) and the XPG4.2 speciﬁcation. (The ISO/ANSI C

committee has also included them in the C9X draft standard.) These

functions are:

acosh(x) Returns inverse hyperbolic cosine of x

asinh(x) Returns inverse hyperbolic sine of x

atanh(x) Returns inverse hyperbolic tangent of

cbrt(x) Returns cube root of x

expm1(x) Returns exp(x) - 1

ilogb(x) Returns the integer form of the

binary exponent of the ﬂoating-point

value x

log1p(x) Returns log(1 + x)

logb(x) Returns the exponent of x as an

integer-valued double-precision

number

nextafter(x, y) Returns the next representable

neighbor of x in the direction of y

remainder(x, y) Returns exact ﬂoating-point

remainder as deﬁned by IEEE

standard