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IEEE_TEST (3) | C library functions | Unix Manual Pages | :man

NAME

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

CONTENTS

Library
Synopsis
Description
See Also
Standards

LIBRARY


.Lb libm

SYNOPSIS


.In 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

These functions allow users to test conformance to -ieee754. Their use is not otherwise recommended.

logb x and logbf x return x ’s exponent n, a signed integer converted to double-precision floating-point. logb ±oo = +oo; logb 0 = -oo with a division by zero exception.

scalb x n and scalbf x n return x *(2** n) computed by exponent manipulation. If n is not an integer, ±oo, or an NaN, the result is unspecified.

significand x and significandf x return sig, where x := sig * 2** n with 1 <= sig < 2. significand x and significandf x are not defined when x is 0, ±oo, or NaN.

SEE ALSO

ieee(3), math(3)

STANDARDS


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