mirror of https://github.com/mkerrisk/man-pages
120 lines
3.3 KiB
Groff
120 lines
3.3 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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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.\" manual page may be incorrect or out-of-date.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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.\" %%%LICENSE_END
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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 1993-03-29, David Metcalfe
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.\" Modified 1993-07-24, Rik Faith (faith@cs.unc.edu)
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.\" Modified 2002-08-10, 2003-11-01 Walter Harms, aeb
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.\"
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.TH DIV 3 2020-06-09 "" "Linux Programmer's Manual"
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.SH NAME
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div, ldiv, lldiv, imaxdiv \- compute quotient and remainder of
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an integer division
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.SH SYNOPSIS
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.nf
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.B #include <stdlib.h>
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.PP
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.BI "div_t div(int " numerator ", int " denominator );
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.BI "ldiv_t ldiv(long " numerator ", long " denominator );
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.BI "lldiv_t lldiv(long long " numerator ", long long " denominator );
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.PP
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.B #include <inttypes.h>
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.PP
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.BI "imaxdiv_t imaxdiv(intmax_t " numerator ", intmax_t " denominator );
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.fi
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.PP
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.RS -4
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.RE
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.ad l
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.PP
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.BR lldiv ():
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.RS 4
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_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
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.RE
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.ad
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.SH DESCRIPTION
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The
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.BR div ()
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function computes the value
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\fInumerator\fP/\fIdenominator\fP and
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returns the quotient and remainder in a structure
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named \fIdiv_t\fP that contains
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two integer members (in unspecified order) named \fIquot\fP and \fIrem\fP.
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The quotient is rounded toward zero.
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The result satisfies \fIquot\fP*\fIdenominator\fP+\fIrem\fP = \fInumerator\fP.
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.PP
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The
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.BR ldiv (),
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.BR lldiv (),
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and
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.BR imaxdiv ()
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functions do the same,
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dividing numbers of the indicated type and
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returning the result in a structure
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of the indicated name, in all cases with fields \fIquot\fP and \fIrem\fP
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of the same type as the function arguments.
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.SH RETURN VALUE
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The \fIdiv_t\fP (etc.) structure.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lbw33 lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR div (),
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.BR ldiv (),
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.BR lldiv (),
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.BR imaxdiv ()
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T} Thread safety MT-Safe
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.TE
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.SH CONFORMING TO
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POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
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The functions
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.BR lldiv ()
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and
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.BR imaxdiv ()
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were added in C99.
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.SH EXAMPLES
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After
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.PP
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.in +4n
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.EX
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div_t q = div(\-5, 3);
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.EE
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.in
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.PP
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the values \fIq.quot\fP and \fIq.rem\fP are \-1 and \-2, respectively.
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.SH SEE ALSO
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.BR abs (3),
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.BR remainder (3)
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