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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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