log2(3M)																  log2(3M)

NAME

       log2(), log2f(), log2l(), log2w(), log2q() - logarithm base two functions

SYNOPSIS

   HP Integrity Server Only
DESCRIPTION

       returns the logarithm base two of x.

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

   Integrity Server Only
       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 the option.

       Make sure your program includes and 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

       If x is +INFINITY, returns +INFINITY.

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

       If x is less than zero, returns NaN and raises the invalid exception.

       If x is NaN, returns NaN.

       raises the inexact exception whenever a rounded result does not equal the mathematical result.

ERRORS

       If x is less than 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

       exp(3M), exp10(3M), log(3M), log1p(3M), log2(3M), pow(3M), math(5).

STANDARDS CONFORMANCE

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

																	  log2(3M)