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IEEE_TEST(3)		    BSD Programmer's Manual		  IEEE_TEST(3)

NAME
     logb, logbf, scalb, scalbf, significand, significandf - IEEE test func-
     tions

SYNOPSIS
     #include <math.h>

     double
     logb(double x);

     float
     logbf(float x);

     double
     scalb(double x, double n);

     float
     scalbf(float x, float n);

     double
     significand(double x);

     float
     significandf(float x);

DESCRIPTION
     These functions allow users to test conformance to IEEE 754.  Their use
     is not otherwise recommended.

     logb(x) and logbf(x) return x's exponent n, a signed integer converted to
     double-precision floating-point.  logb(+-infinity) = +infinity; logb(0) =
     -infinity with a division by zero exception.

     scalbn(x, n) and scalbnf(x, n) return x*(2**n) computed by exponent ma-
     nipulation.

     significand(x) and significandf(x) return sig, where x := sig * 2**n with
     1 <= sig < 2.  significand(x) and significandf(x) are not defined when x
     is 0, +-infinity, or NaN.

ERRORS
     For scalb() or scalbf(), if the result would overflow or underflow, then:

     _IEEE_    The return value is +-Inf or +-0, respectively.	The sign of
	       the result matches x.
     _POSIX_   Same as _IEEE_, but errno is also set to ERANGE.
     _XOPEN_   Same as _POSIX_, but errno is only set if matherr(3) returns 0.
	       The exception type is OVERFLOW or UNDERFLOW, respectively.
     _SVID_    Same as _XOPEN_.

SEE ALSO
     ieee(3),  math(3)

BSDI BSD/OS			 March 4, 1998				     1
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