IEEE_TEST(3) BSD Library Functions Manual IEEE_TEST(3)
NAME
logb, logbf, logbl, scalb, scalbf, significand, significandf -- IEEE test functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
logb(double x);
float
logbf(float x);
long double
logbl(long double 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) 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
math(3)
STANDARDS
IEEE Std 754-1985
BSD
August 3, 2011 BSD
