man3/significand.3

   1 .\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
   2 .\" Distributed under GPL
   3 .\" based on glibc infopages
   4 .TH SIGNIFICAND 3 2007-07-26 "GNU" "Linux Programmer's Manual"
   5 .SH NAME
   6 significand, significandf, significandl \-
   7 get mantissa of floating point number
   8 .SH SYNOPSIS
   9 .B #include <math.h>
  10 .sp
  11 .BI "double significand(double " x );
  12 .br
  13 .BI "float significandf(float " x );
  14 .br
  15 .BI "long double significandl(long double " x );
  16 .sp
  17 Link with \fI\-lm\fP.
  18 .sp
  19 .in -4n
  20 Feature Test Macro Requirements for glibc (see
  21 .BR feature_test_macros (7)):
  22 .in
  23 .sp
  24 .ad l
  25 .BR significand (),
  26 .BR significandf (),
  27 .BR significandl ():
  28 _SVID_SOURCE || _BSD_SOURCE
  29 .ad b
  30 .SH DESCRIPTION
  31 The
  32 .BR significand ()
  33 function returns the mantissa of
  34 .I x
  35 scaled to the range [1,2).
  36 It is equivalent to
  37 .sp
  38 .in +4n
  39 scalb(x, (double) \-ilogb(x))
  40 .in
  41 .PP
  42 This function exists mainly for use in certain standardized tests
  43 for IEEE 754 conformance.
  44 .\" .SH HISTORY
  45 .\" This function came from BSD.
  46 .SH "SEE ALSO"
  47 .BR ilogb (3),
  48 .BR scalb (3)