significand(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON

SIGNIFICAND(3)          Linux Programmer's Manual         SIGNIFICAND(3)

NAME         top

       significand, significandf, significandl - get mantissa of
       floating-point number

SYNOPSIS         top

       #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

DESCRIPTION         top

       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         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             Attribute     Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │significand(), significandf(),        │ Thread safety │ MT-Safe │
       │significandl()                        │               │         │
       └──────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO         top

       These functions are nonstandard; the double version is available
       on a number of other systems.

SEE ALSO         top

       ilogb(3), scalb(3)

COLOPHON         top

       This page is part of release 5.12 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)