significandf(3) — Linux manual page


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 versions <= 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

       │Interface       Attribute     Value   │
       │significand(),  │ Thread safety │ MT-Safe │
       │significandf(), │               │         │
       │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

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       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

GNU                              2017-09-15                   SIGNIFICAND(3)