logb(3) - NetBSD Manual Pages

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IEEE_TEST(3)            NetBSD 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-pre- cision 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 NetBSD 6.0 August 3, 2011 NetBSD 6.0
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