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 2015-04-19 "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 .sp
  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 .sp
  22 Link with \fI\-lm\fP.
  23 .sp
  24 .in -4n
  25 Feature Test Macro Requirements for glibc (see
  26 .BR feature_test_macros (7)):
  27 .in
  28 .sp
  29 .ad l
  30 .BR significand (),
  31 .BR significandf (),
  32 .BR significandl ():
  33 .RS 4
  34 _SVID_SOURCE || _BSD_SOURCE
  35 .RE
  36 .ad b
  37 .SH DESCRIPTION
  38 These functions return the mantissa of
  39 .I x
  40 scaled to the range [1,2).
  41 They are equivalent to
  42 .sp
  43 .in +4n
  44 scalb(x, (double) \-ilogb(x))
  45 .in
  46 .PP
  47 This function exists mainly for use in certain standardized tests
  48 for IEEE 754 conformance.
  49 .SH ATTRIBUTES
  50 For an explanation of the terms used in this section, see
  51 .BR attributes (7).
  52 .TS
  53 allbox;
  54 lb lb lb
  55 l l l.
  56 Interface       Attribute       Value
  57 T{
  58 .BR significand (),
  59 .br
  60 .BR significandf (),
  61 .br
  62 .BR significandl ()
  63 T}      Thread safety   MT-Safe
  64 .TE
  65
  66 .SH CONFORMING TO
  67 These functions are nonstandard; the
  68 .I double
  69 version is available on a number of other systems.
  70 .\" .SH HISTORY
  71 .\" This function came from BSD.
  72 .SH SEE ALSO
  73 .BR ilogb (3),
  74 .BR scalb (3)