hpux man page for logbl

logb(3M)																  logb(3M)

NAME
       logb(), logbf(), logbl(), logbw(), logbq() - radix-independent exponent functions

SYNOPSIS
   HP Integrity Server Only
DESCRIPTION
       The  function computes the exponent of the floating point value x.  Formally, the return value is the integral part of log base r of |x| as
       a signed floating point value, for nonzero x, where r is the radix of the machine's floating-point arithmetic.  The radix r is 2  on  HP-UX
       systems.

       If x is denormal, it is treated as though it were normalized, before the exponent is determined.

   Integrity Server Only
       is a version of it takes a argument and returns a result.

       is a version of it takes a argument and returns a result.

       is an version of it takes an argument and returns an result.

       is equivalent to on HP-UX systems.

USAGE
       To use these functions, compile either with the default option or with the and options.

       To use (for Integrity servers) or compile also with

       Make  sure  your program includes Link in the math library by specifying on the compiler or linker command line.  For more information, see
       the at the following site:

RETURN VALUE
       Upon successful completion, returns the exponent of x.

       If x is NaN, returns NaN.

       If x returns +INFINITY.

       If x is zero, returns (equal to -INFINITY) and raises the divide-by-zero floating-point exception.

ERRORS
       If x is zero, sets to [EDOM].

   Integrity Server Only
       HP-UX functions on Integrity servers do not set by default.  For setting, compile with the option.

SEE ALSO
       frexp(3M), ilogb(3M), scalb(3M), scalbn(3M), scalbln(3M), math(5).

STANDARDS CONFORMANCE
       : SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

       : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

																	  logb(3M)