Node:Integer Division,
Next:Floating Point Numbers,
Previous:Integers,
Up:Arithmetic
Integer Division
This section describes functions for performing integer division. These
functions are redundant when GNU CC is used, because in GNU C the
/
operator always rounds towards zero. But in other C
implementations, /
may round differently with negative arguments.
div
and ldiv
are useful because they specify how to round
the quotient: towards zero. The remainder has the same sign as the
numerator.
These functions are specified to return a result r such that the value
r.quot*denominator + r.rem
equals
numerator.
To use these facilities, you should include the header file
stdlib.h
in your program.
This is a structure type used to hold the result returned by the div
function. It has the following members:
int quot
- The quotient from the division.
int rem
- The remainder from the division.
|
div_t div (int numerator, int denominator)
|
Function |
This function div computes the quotient and remainder from
the division of numerator by denominator, returning the
result in a structure of type div_t .
If the result cannot be represented (as in a division by zero), the
behavior is undefined.
Here is an example, albeit not a very useful one.
div_t result;
result = div (20, -6);
Now result.quot is -3 and result.rem is 2 .
|
This is a structure type used to hold the result returned by the ldiv
function. It has the following members:
long int quot
- The quotient from the division.
long int rem
- The remainder from the division.
(This is identical to div_t except that the components are of
type long int rather than int .)
|
ldiv_t ldiv (long int numerator, long int denominator)
|
Function |
The ldiv function is similar to div , except that the
arguments are of type long int and the result is returned as a
structure of type ldiv_t .
|
This is a structure type used to hold the result returned by the lldiv
function. It has the following members:
long long int quot
- The quotient from the division.
long long int rem
- The remainder from the division.
(This is identical to div_t except that the components are of
type long long int rather than int .)
|
lldiv_t lldiv (long long int numerator, long long int denominator)
|
Function |
The lldiv function is like the div function, but the
arguments are of type long long int and the result is returned as
a structure of type lldiv_t .
The lldiv function was added in ISO C99.
|
This is a structure type used to hold the result returned by the imaxdiv
function. It has the following members:
intmax_t quot
- The quotient from the division.
intmax_t rem
- The remainder from the division.
(This is identical to div_t except that the components are of
type intmax_t rather than int .)
See Integers for a description of the intmax_t type.
|
imaxdiv_t imaxdiv (intmax_t numerator, intmax_t denominator)
|
Function |
The imaxdiv function is like the div function, but the
arguments are of type intmax_t and the result is returned as
a structure of type imaxdiv_t .
See Integers for a description of the intmax_t type.
The imaxdiv function was added in ISO C99.
|