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IEEE_TEST(3) Library Functions Manual IEEE_TEST(3)

logb, logbf, logbl, scalb, scalbf, significand, significandfIEEE test functions

library “libm”

#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);

These functions allow users to test conformance to IEEE Std 754-1985. Their use is otherwise not recommended.

(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.

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

(x) returns sig, where x := sig ∗ 2**n with 1 ≤ sig < 2. significand(x) is not defined when x is 0, ±infinity, or NaN.

math(3)

IEEE Std 754-1985

August 3, 2011 NetBSD-9.2