<s>
In	O
computing	O
,	O
a	O
signed	B-Device
overpunch	I-Device
is	O
a	O
coding	O
scheme	O
which	O
stores	O
the	O
sign	O
of	O
a	O
number	O
by	O
changing	O
(	O
usually	O
)	O
the	O
last	O
digit	O
.	O
</s>
<s>
It	O
is	O
used	O
in	O
character	O
data	O
on	O
IBM	O
mainframes	O
by	O
languages	O
such	O
as	O
COBOL	B-Application
,	O
PL/I	B-Language
,	O
and	O
RPG	B-Language
.	O
</s>
<s>
The	O
PACK	O
instruction	O
on	O
IBM	B-Device
System/360	I-Device
architecture	I-Device
machines	O
converts	O
the	O
sign	O
of	O
a	O
zoned	O
decimal	O
number	O
when	O
converting	O
to	O
packed	O
decimal	O
,	O
</s>
<s>
PL/I	B-Language
uses	O
the	O
PICTURE	O
attribute	O
to	O
declare	O
zoned	O
decimal	O
data	O
with	O
a	O
signed	B-Device
overpunch	I-Device
.	O
</s>
<s>
COBOL	B-Application
uses	O
the	O
picture	O
character	O
'	O
S	O
 '	O
for	O
USAGE	O
IS	O
DISPLAY	O
data	O
without	O
SIGN	O
IS	O
SEPARATE	O
CHARACTER	O
to	O
indicate	O
an	O
overpunch	O
.	O
</s>
<s>
Representation	O
of	O
signed	B-Device
overpunch	I-Device
characters	O
"	O
is	O
not	O
standardized	O
in	O
ASCII	O
,	O
and	O
different	O
compilers	O
use	O
different	O
overpunch	O
codes.	O
"	O
</s>
<s>
Gnu	O
COBOL	B-Application
and	O
MicroFocus	O
COBOL	B-Application
use	O
lower-case	O
'	O
p	O
 '	O
thru	O
'	O
y	O
 '	O
to	O
represent	O
negative	O
'	O
0	O
 '	O
thru	O
'	O
9	O
 '	O
.	O
</s>
<s>
PL/I	B-Language
compilers	O
on	O
ASCII	O
systems	O
use	O
the	O
same	O
set	O
of	O
characters	O
( {	O
,	O
J	O
–	O
R	O
)	O
as	O
EBCDIC	O
to	O
represent	O
overpunches	O
.	O
</s>
