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logbf(3)

NAME

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

LIBRARY

     Math Library (libm, -lm)

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 Std 754-1985.
     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.

     scalb(x, n) and scalbf(x, n) return x*(2**n) computed by exponent manipu-
     lation.  If n is not an integer, +-infinity, or an NaN, the result is
     unspecified.

     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.

SEE ALSO

     ieee(3), math(3)

STANDARDS

     IEEE Std 754-1985

FreeBSD 5.4			March 10, 1994			   FreeBSD 5.4

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