NAME    [Toc]    [Back]

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

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) returns 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.  logbf()  is  the  single
precision form
     of logb().

     scalb(x,  n) returns x*(2**n) computed by exponent manipulation.  scalbf()
     is the single precision form of scalb().

     significand(x) returns sig, where x := sig * 2**n with 1  <=
sig < 2.
     significand(x)  is  not  defined when x is 0, +-Infinity, or
NaN.
     significandf() is the single precision for of significand().

SEE ALSO    [Toc]    [Back]

     ieee(3), math(3)

STANDARDS    [Toc]    [Back]

     IEEE Std 754-1985

OpenBSD      3.6                          March      10,     1994