logd64.3m (2010 09)

l
logd64(3M) logd64(3M)
(HP Integrity Server Only)
NAME
logd64(), logd128(), logd32() - decimal natural logarithm functions
SYNOPSIS
#define __STDC_WANT_DEC_FP__
#include <math.h>
_Decimal64 logd64(_Decimal64 x);
_Decimal128 logd128(_Decimal128 x);
_Decimal32 logd32(_Decimal32 x);
DESCRIPTION
logd64() returns the natural logarithm of x.
logd128() is a _Decimal128 version of logd64(); it takes a
_Decimal128 argument and returns
a
_Decimal128 result.
logd32() is a _Decimal32 version of logd64(); it takes a
_Decimal32 argument and returns a
_Decimal32 result.
These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.
USAGE
To use any of these functions, compile with the +decfp option.
Make sure your program defines
__STDC_WANT_DEC_FP__
and then includes <math.h>.
Link in the math library by specifying
-lm or -l:libm.a on the linking command line.
For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site:
http://www.hp.com/go/fp
.
RETURN VALUE
If x is +infinity,
logd64() returns +infinity.
If x is 0,
logd64() returns − infinity and raises the divide-by-zero exception.
If x is less than 0,
logd64() returns NaN and raises the invalid exception.
If x is NaN,
logd64() returns NaN.
logd64() raises the inexact exception whenever a rounded result does not equal the mathematical
result.
ERRORS
If x is less than 0,
logd64() sets errno to [EDOM].
If x is 0,
logd64() sets errno to [ERANGE].
SEE ALSO
expd64(3M), log10d64(3M), log1pd64(3M), log2d64(3M), math(5).
STANDARDS CONFORMANCE
These functions conform to ISO/IEC TR 24732, "Extension for the programming language C to support
decimal floating-point arithmetic".
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1