Linux manual pages Section 3: Subroutines  

Name

div, ldiv, lldiv, imaxdiv — compute quotient and remainder of an integer division

Synopsis

#include <stdlib.h>
div_t div( int numerator,
  int denominator);
 
ldiv_t ldiv( long numerator,
  long denominator);
 
lldiv_t lldiv( long long numerator,
  long long denominator);
  
#include <inttypes.h>
imaxdiv_t imaxdiv( intmax_t numerator,
  intmax_t denominator);
 
[Note] Note
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
lldiv():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

DESCRIPTION

The div() function computes the value numerator/denominator and returns the quotient and remainder in a structure named div_t that contains two integer members (in unspecified order) named quot and rem. The quotient is rounded toward zero. The result satisfies quot*denominator+rem = numerator.

The ldiv(), lldiv(), and imaxdiv() functions do the same, dividing numbers of the indicated type and returning the result in a structure of the indicated name, in all cases with fields quot and rem of the same type as the function arguments.

RETURN VALUE

The div_t (etc.) structure.

ATTRIBUTES

Multithreading (see pthreads(7))

The div(), ldiv(), lldiv(), and imaxdiv() functions are thread-safe.

CONFORMING TO

SVr4, 4.3BSD, C89. C99. The functions lldiv() and imaxdiv() were added in C99.

EXAMPLE

After

        div_t q = div(−5, 3);

the values q.quot and q.rem are −1 and −2, respectively.

SEE ALSO

abs(3), remainder(3)

COLOPHON

This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man−pages/.


  Copyright 1993 David Metcalfe (davidprism.demon.co.uk)

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References consulted:
    Linux libc source code
    Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
    386BSD man pages

Modified 1993-03-29, David Metcalfe
Modified 1993-07-24, Rik Faith (faithcs.unc.edu)
Modified 2002-08-10, 2003-11-01 Walter Harms, aeb