1SIGNIFICAND(3)             Linux Programmer's Manual            SIGNIFICAND(3)
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NAME

6       significand,  significandf,  significandl  -  get mantissa of floating-
7       point number
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SYNOPSIS

10       #include <math.h>
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12       double significand(double x);
13       float significandf(float x);
14       long double significandl(long double x);
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16       Link with -lm.
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18   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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20       significand(), significandf(), significandl():
21           /* Since glibc 2.19: */ _DEFAULT_SOURCE
22               || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

25       These functions return the mantissa of x scaled  to  the  range  [1,2).
26       They are equivalent to
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28           scalb(x, (double) -ilogb(x))
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30       This  function  exists mainly for use in certain standardized tests for
31       IEEE 754 conformance.
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ATTRIBUTES

34       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
35       tributes(7).
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37       ┌────────────────────────────────────────────┬───────────────┬─────────┐
38       │Interface                                   │ Attribute     │ Value   │
39       ├────────────────────────────────────────────┼───────────────┼─────────┤
40       │significand(), significandf(),              │ Thread safety │ MT-Safe │
41       │significandl()                              │               │         │
42       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

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

49       ilogb(3), scalb(3)
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COLOPHON

52       This  page  is  part of release 5.13 of the Linux man-pages project.  A
53       description of the project, information about reporting bugs,  and  the
54       latest     version     of     this    page,    can    be    found    at
55       https://www.kernel.org/doc/man-pages/.
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59GNU                               2021-03-22                    SIGNIFICAND(3)