NAME    [Toc]    [Back]

     logb, logbf, scalb, scalbf, significand, significandf -- IEEE test functions

LIBRARY    [Toc]    [Back]

     Math Library (libm, -lm)

SYNOPSIS    [Toc]    [Back]

     #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    [Toc]    [Back]

     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.

     scalbn(x, n) and scalbnf(x, n) return x*(2**n) computed by exponent
     manipulation.

     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    [Toc]    [Back]

     ieee(3), math(3)

STANDARDS    [Toc]    [Back]

     IEEE Std 754-1985


FreeBSD 5.2.1			March 10, 1994			 FreeBSD 5.2.1