man3/fabs.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
   2 .\"
   3 .\" Permission is granted to make and distribute verbatim copies of this
   4 .\" manual provided the copyright notice and this permission notice are
   5 .\" preserved on all copies.
   6 .\"
   7 .\" Permission is granted to copy and distribute modified versions of this
   8 .\" manual under the conditions for verbatim copying, provided that the
   9 .\" entire resulting derived work is distributed under the terms of a
  10 .\" permission notice identical to this one.
  11 .\"
  12 .\" Since the Linux kernel and libraries are constantly changing, this
  13 .\" manual page may be incorrect or out-of-date.  The author(s) assume no
  14 .\" responsibility for errors or omissions, or for damages resulting from
  15 .\" the use of the information contained herein.  The author(s) may not
  16 .\" have taken the same level of care in the production of this manual,
  17 .\" which is licensed free of charge, as they might when working
  18 .\" professionally.
  19 .\"
  20 .\" Formatted or processed versions of this manual, if unaccompanied by
  21 .\" the source, must acknowledge the copyright and authors of this work.
  22 .\"
  23 .\" References consulted:
  24 .\"     Linux libc source code
  25 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  26 .\"     386BSD man pages
  27 .\" Modified Sat Jul 24 19:42:04 1993 by Rik Faith (faith@cs.unc.edu)
  28 .\" Added fabsl, fabsf, aeb, 2001-06-07
  29 .\"
  30 .TH FABS 3  2001-06-07 "" "Linux Programmer's Manual"
  31 .SH NAME
  32 fabs, fabsf, fabsl \- absolute value of floating-point number
  33 .SH SYNOPSIS
  34 .nf
  35 .B #include <math.h>
  36 .sp
  37 .BI "double fabs(double " x );
  38 .br
  39 .BI "float fabsf(float " x );
  40 .br
  41 .BI "long double fabsl(long double " x );
  42 .fi
  43 .sp
  44 Link with \-lm.
  45 .SH DESCRIPTION
  46 The \fBfabs\fP() functions return the absolute value of the floating-point
  47 number \fIx\fP.
  48 .SH ERRORS
  49 No errors can occur.
  50 .SH "CONFORMING TO"
  51 The
  52 .BR fabs ()
  53 function conforms to SVr4, POSIX.1-2001, 4.3BSD, C89.
  54 The other functions are from C99.
  55 .SH "SEE ALSO"
  56 .BR abs (3),
  57 .BR ceil (3),
  58 .BR cabs (3),
  59 .BR floor (3),
  60 .BR labs (3),
  61 .BR rint (3)