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NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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SIGNIFICAND(3) Linux Programmer's Manual SIGNIFICAND(3)
significand, significandf, significandl - get mantissa of
floating-point number
#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 <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│significand(), significandf(), │ Thread safety │ MT-Safe │
│significandl() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
These functions are nonstandard; the double version is available
on a number of other systems.
ilogb(3), scalb(3)
This page is part of release 5.13 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 2021-03-22 SIGNIFICAND(3)
Pages that refer to this page: ilogb(3)
Copyright and license for this manual page
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