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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\"
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.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
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.\" Modified 2002-08-10 Walter Harms
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.\" (walter.harms@informatik.uni-oldenburg.de)
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.\" Modified 2003-11-18, 2004-10-05 aeb
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.\"
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.TH REMAINDER 3 2003-11-18 "" "Linux Programmer's Manual"
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.SH NAME
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drem, dremf, dreml, remainder, remainderf, remainderl \- \
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floating-point remainder function
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.SH SYNOPSIS
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.nf
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.B #include <math.h>
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.sp
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/* The C99 versions */
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.BI "double remainder(double " x ", double " y );
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.BI "float remainderf(float " x ", float " y );
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.BI "long double remainderl(long double " x ", long double " y );
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.sp
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/* Obsolete synonyms */
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.BI "double drem(double " x ", double " y );
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.BI "float dremf(float " x ", float " y );
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.BI "long double dreml(long double " x ", long double " y );
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.sp
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.fi
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Link with \fI-lm\fP.
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.SH DESCRIPTION
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The
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.BR remainder ()
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function computes the remainder of dividing
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.I x
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by
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.IR y .
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The return value is
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.IR x " \- " n " * " y ,
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where
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.I n
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is the value
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.IR x " / " y ,
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rounded to the nearest integer.
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If this quotient is 1/2 (mod 1), it is rounded to the nearest even number
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(independent of the current rounding mode).
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If the return value is 0, it has the sign of
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.IR x .
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.LP
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The
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.BR drem ()
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function does precisely the same thing.
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.SH "RETURN VALUE"
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The
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.BR remainder ()
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function returns the remainder, unless
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.I y
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is zero, when the function fails and
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.I errno
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is set.
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.SH ERRORS
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.TP
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.B EDOM
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The denominator
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.I y
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is zero.
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.SH "CONFORMING TO"
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IEC 60559.
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The functions
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.BR remainder (),
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.BR remainderf (),
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and
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.BR remainderl ()
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are from C99.
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The function
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.BR drem ()
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is from 4.3BSD.
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The
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.I float
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and
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.I "long double"
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variants
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.BR dremf ()
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and
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.BR dreml ()
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exist on some systems, such as Tru64 and glibc2.
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.SH EXAMPLE
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The call "remainder(29.0, 3.0)" returns \-1.
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.SH "SEE ALSO"
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.BR fmod (3),
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.BR remquo (3)
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