man:significand
SIGNIFICAND(3) Linux Programmer's Manual SIGNIFICAND(3)
NAME
significand, significandf, significandl - get mantissa of floating- point number
SYNOPSIS
#include <math.h>
double significand(double x); float significandf(float x); long double significandl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
significand(), significandf(), significandl(): /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
These functions return the mantissa of x scaled to the range [1,2). They are equivalent to
scalb(x, (double) -ilogb(x))
This function exists mainly for use in certain standardized tests for IEEE 754 conformance.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+----------------+---------------+---------+ |Interface | Attribute | Value | +----------------+---------------+---------+ |significand(), | Thread safety | MT-Safe | |significandf(), | | | |significandl() | | | +----------------+---------------+---------+
CONFORMING TO
These functions are nonstandard; the double version is available on a number of other systems.
SEE ALSO
ilogb(3), scalb(3)
COLOPHON
This page is part of release 4.16 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
GNU 2017-09-15 SIGNIFICAND(3)
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