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) 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.

     scalbn(x, n) returns x*(2**n) computed by exponent manipulation.

     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.

SEE ALSO    [Toc]    [Back]

     ieee(3), math(3)

STANDARDS    [Toc]    [Back]

     IEEE Std 754-1985

BSD                             March 10, 1994                             BSD