<s>
A	O
default	O
,	O
in	O
computer	B-General_Concept
science	I-General_Concept
,	O
refers	O
to	O
the	O
preexisting	O
value	O
of	O
a	O
user-configurable	O
setting	O
that	O
is	O
assigned	O
to	O
a	O
software	B-Application
application	I-Application
,	O
computer	B-Application
program	I-Application
or	O
device	B-Device
.	O
</s>
<s>
Default	O
values	O
are	O
standards	O
values	O
that	O
are	O
universal	O
to	O
all	O
instances	O
of	O
the	O
device	B-Device
or	O
model	O
and	O
intended	O
to	O
make	O
the	O
device	B-Device
as	O
accessible	O
as	O
possible	O
"	O
out	O
of	O
the	O
box	O
"	O
without	O
necessitating	O
a	O
lengthy	O
configuration	O
process	O
prior	O
to	O
use	O
.	O
</s>
<s>
One	O
use	O
of	O
default	B-Language
parameters	I-Language
is	O
for	O
initial	O
settings	O
for	O
application	B-Application
software	I-Application
.	O
</s>
<s>
Changing	O
the	O
default	O
for	O
the	O
next	O
run	O
would	O
involve	O
storing	O
user	O
information	O
in	O
some	O
place	O
,	O
such	O
as	O
in	O
cookies	B-Application
on	O
the	O
user	O
's	O
computer	O
for	O
an	O
Internet	O
application	O
.	O
</s>
<s>
In	O
Microsoft	B-Application
Windows	I-Application
,	O
default	O
file	O
associations	O
associate	O
applications	O
with	O
file	O
types	O
.	O
</s>
<s>
A	O
TV	B-Operating_System
or	O
computer	O
monitor	O
typically	O
comes	O
with	O
a	O
button	O
to	O
"	O
restore	O
factory	O
presets	O
"	O
.	O
</s>
<s>
Some	O
software	B-Application
applications	I-Application
,	O
however	O
,	O
require	O
that	O
default	O
values	O
be	O
supplied	O
.	O
</s>
<s>
Many	O
languages	O
in	O
the	O
C	B-Language
family	O
(	O
but	O
not	O
C	B-Language
itself	O
,	O
as	O
of	O
C11	O
)	O
allow	O
a	O
function	O
to	O
have	O
default	B-Language
parameters	I-Language
or	O
default	B-Language
arguments	I-Language
,	O
that	O
are	O
used	O
if	O
the	O
function	O
is	O
called	O
with	O
omitted	O
parameter	O
specifications	O
.	O
</s>
<s>
In	O
C	B-Language
and	O
programming	O
languages	O
based	O
on	O
its	O
syntax	O
,	O
the	O
switch	O
statement	O
(	O
which	O
dispatches	O
among	O
a	O
number	O
of	O
alternatives	O
)	O
can	O
make	O
use	O
of	O
the	O
default	O
keyword	O
to	O
provide	O
a	O
case	O
for	O
when	O
no	O
other	O
case	O
matches	O
.	O
</s>
<s>
In	O
Fortran	B-Application
,	O
the	O
INIT	O
parameter	O
on	O
a	O
declaration	O
defines	O
an	O
initial	O
default	O
value	O
for	O
that	O
variable	O
.	O
</s>
<s>
In	O
Rust	B-Application
,	O
types	O
that	O
implement	O
the	O
Default	O
trait	O
can	O
produce	O
a	O
default	O
value	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
primitive	O
integer	O
types	O
in	O
Rust	B-Application
implement	O
the	O
Default	O
trait	O
by	O
returning	O
0	O
.	O
</s>
<s>
In	O
operating	O
systems	O
using	O
a	O
command	B-Application
line	I-Application
interface	I-Application
,	O
the	O
user	O
types	O
short	O
commands	O
often	O
followed	O
by	O
various	O
parameters	O
and	O
options	O
.	O
</s>
