man3/significand.3

   1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
   2 .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
   3 .\" Distributed under GPL
   4 .\" %%%LICENSE_END
   5 .\" heavily based on glibc infopages, copyright Free Software Foundation
   6 .TH SIGNIFICAND 3 2009-02-04 "GNU" "Linux Programmer's Manual"
   7 .SH NAME
   8 significand, significandf, significandl \-
   9 get mantissa of floating-point number
  10 .SH SYNOPSIS
  11 .B #include <math.h>
  12 .sp
  13 .BI "double significand(double " x );
  14 .br
  15 .BI "float significandf(float " x );
  16 .br
  17 .BI "long double significandl(long double " x );
  18 .sp
  19 Link with \fI\-lm\fP.
  20 .sp
  21 .in -4n
  22 Feature Test Macro Requirements for glibc (see
  23 .BR feature_test_macros (7)):
  24 .in
  25 .sp
  26 .ad l
  27 .BR significand (),
  28 .BR significandf (),
  29 .BR significandl ():
  30 .RS 4
  31 _SVID_SOURCE || _BSD_SOURCE
  32 .RE
  33 .ad b
  34 .SH DESCRIPTION
  35 The
  36 .BR significand ()
  37 function returns the mantissa of
  38 .I x
  39 scaled to the range [1,2).
  40 It is equivalent to
  41 .sp
  42 .in +4n
  43 scalb(x, (double) \-ilogb(x))
  44 .in
  45 .PP
  46 This function exists mainly for use in certain standardized tests
  47 for IEEE 754 conformance.
  48 .SH CONFORMING TO
  49 These functions are nonstandard; the
  50 .I double
  51 version is available on a number of other systems.
  52 .\" .SH HISTORY
  53 .\" This function came from BSD.
  54 .SH SEE ALSO
  55 .BR ilogb (3),
  56 .BR scalb (3)