man3/significand.3

   1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
   2 .\"
   3 .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
   4 .\" Distributed under GPL
   5 .\" %%%LICENSE_END
   6 .\"
   7 .\" heavily based on glibc infopages, copyright Free Software Foundation
   8 .\"
   9 .TH SIGNIFICAND 3 2017-09-15 "GNU" "Linux Programmer's Manual"
  10 .SH NAME
  11 significand, significandf, significandl \-
  12 get mantissa of floating-point number
  13 .SH SYNOPSIS
  14 .B #include <math.h>
  15 .PP
  16 .BI "double significand(double " x );
  17 .br
  18 .BI "float significandf(float " x );
  19 .br
  20 .BI "long double significandl(long double " x );
  21 .PP
  22 Link with \fI\-lm\fP.
  23 .PP
  24 .in -4n
  25 Feature Test Macro Requirements for glibc (see
  26 .BR feature_test_macros (7)):
  27 .in
  28 .PP
  29 .ad l
  30 .BR significand (),
  31 .BR significandf (),
  32 .BR significandl ():
  33 .RS 4
  34 /* Since glibc 2.19: */ _DEFAULT_SOURCE
  35     || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
  36 .RE
  37 .ad b
  38 .SH DESCRIPTION
  39 These functions return the mantissa of
  40 .I x
  41 scaled to the range [1,2).
  42 They are equivalent to
  43 .PP
  44 .in +4n
  45 .EX
  46 scalb(x, (double) \-ilogb(x))
  47 .EE
  48 .in
  49 .PP
  50 This function exists mainly for use in certain standardized tests
  51 for IEEE 754 conformance.
  52 .SH ATTRIBUTES
  53 For an explanation of the terms used in this section, see
  54 .BR attributes (7).
  55 .TS
  56 allbox;
  57 lb lb lb
  58 l l l.
  59 Interface       Attribute       Value
  60 T{
  61 .BR significand (),
  62 .br
  63 .BR significandf (),
  64 .br
  65 .BR significandl ()
  66 T}      Thread safety   MT-Safe
  67 .TE
  68 .sp 1
  69 .SH CONFORMING TO
  70 These functions are nonstandard; the
  71 .I double
  72 version is available on a number of other systems.
  73 .\" .SH HISTORY
  74 .\" This function came from BSD.
  75 .SH SEE ALSO
  76 .BR ilogb (3),
  77 .BR scalb (3)