<s>
QBasic	B-Language
is	O
an	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	O
)	O
and	O
interpreter	B-Language
for	O
a	O
variety	O
of	O
dialects	O
of	O
BASIC	O
which	O
are	O
based	O
on	O
QuickBASIC	B-Language
.	O
</s>
<s>
Code	O
entered	O
into	O
the	O
IDE	O
is	O
compiled	O
to	O
an	O
intermediate	B-Application
representation	I-Application
(	O
IR	B-Application
)	O
,	O
and	O
this	O
IR	B-Application
is	O
immediately	O
executed	O
on	O
demand	O
within	O
the	O
IDE	O
.	O
</s>
<s>
Like	O
QuickBASIC	B-Language
,	O
but	O
unlike	O
earlier	O
versions	O
of	O
Microsoft	O
BASIC	O
,	O
QBasic	B-Language
is	O
a	O
structured	B-Language
programming	I-Language
language	O
,	O
supporting	O
constructs	O
such	O
as	O
subroutines	O
.	O
</s>
<s>
Line	B-Application
numbers	I-Application
,	O
a	O
concept	O
often	O
associated	O
with	O
BASIC	O
,	O
are	O
supported	O
for	O
compatibility	O
,	O
but	O
are	O
not	O
considered	O
good	O
form	O
,	O
having	O
been	O
replaced	O
by	O
descriptive	O
line	O
labels	O
.	O
</s>
<s>
QBasic	B-Language
has	O
limited	O
support	O
for	O
user-defined	O
data	O
types	O
(	O
structures	O
)	O
,	O
and	O
several	O
primitive	O
types	O
used	O
to	O
contain	O
strings	O
of	O
text	O
or	O
numeric	O
data	O
.	O
</s>
<s>
For	O
its	O
time	O
,	O
QBasic	B-Language
provided	O
a	O
state-of-the-art	O
IDE	O
,	O
including	O
a	O
debugger	B-Application
with	O
features	O
such	O
as	O
on-the-fly	O
expression	O
evaluation	O
and	O
code	O
modification	O
.	O
</s>
<s>
QBasic	B-Language
was	O
intended	O
as	O
a	O
replacement	O
for	O
GW-BASIC	B-Language
.	O
</s>
<s>
It	O
was	O
based	O
on	O
the	O
earlier	O
QuickBASIC	B-Language
4.5	O
compiler	O
but	O
without	O
QuickBASIC	B-Language
's	O
compiler	O
and	O
linker	O
elements	O
.	O
</s>
<s>
Version	O
1.0	O
was	O
shipped	O
together	O
with	O
MS-DOS	B-Application
5.0	O
and	O
higher	O
,	O
as	O
well	O
as	O
Windows	B-Application
95	I-Application
,	O
Windows	B-Device
NT	I-Device
3.x	I-Device
,	O
and	O
Windows	B-Device
NT	I-Device
4.0	I-Device
.	O
</s>
<s>
IBM	O
recompiled	O
QBasic	B-Language
and	O
included	O
it	O
in	O
PC	B-Operating_System
DOS	I-Operating_System
5.x	O
,	O
as	O
well	O
as	O
OS/2	B-Application
2.0	O
onwards	O
.	O
</s>
<s>
eComStation	B-Device
and	O
ArcaOS	B-Device
,	O
descended	O
from	O
OS/2	B-Application
code	O
,	O
include	O
QBasic	B-Language
1.0	O
.	O
</s>
<s>
QBasic	B-Language
1.1	O
is	O
included	O
with	O
MS-DOS	B-Application
6.x	O
,	O
and	O
,	O
without	O
EDIT	B-Application
,	O
in	O
Windows	B-Application
95	I-Application
,	O
Windows	B-Device
98	I-Device
and	O
Windows	B-Device
Me	I-Device
.	O
</s>
<s>
Starting	O
with	O
Windows	B-Application
2000	I-Application
,	O
Microsoft	O
no	O
longer	O
includes	O
QBasic	B-Language
with	O
their	O
operating	O
systems	O
.	O
</s>
<s>
QBasic	B-Language
(	O
as	O
well	O
as	O
the	O
built-in	O
MS-DOS	B-Application
Editor	I-Application
)	O
is	O
backwards-compatible	O
with	O
DOS	O
releases	O
prior	O
to	O
5.0	O
(	O
down	O
to	O
at	O
least	O
DOS	O
3.20	O
)	O
.	O
</s>
<s>
However	O
,	O
if	O
used	O
on	O
any	O
8088/8086	O
computers	O
,	O
or	O
on	O
some	O
80286	B-General_Concept
computers	O
,	O
the	O
QBasic	B-Language
program	O
may	O
run	O
very	O
slowly	O
,	O
or	O
perhaps	O
not	O
at	O
all	O
,	O
due	O
to	O
DOS	O
memory	O
size	O
limits	O
.	O
</s>
<s>
Until	O
MS-DOS	B-Application
7	I-Application
,	O
MS-DOS	B-Application
Editor	I-Application
and	O
Help	B-Protocol
required	O
QBasic	B-Language
:	O
the	O
EDIT.COM	B-Application
and	O
HELP.COM	B-Protocol
programs	O
simply	O
started	O
QBasic	B-Language
in	O
editor	O
and	O
help	B-Protocol
mode	O
only	O
,	O
and	O
these	O
can	O
also	O
be	O
entered	O
by	O
running	O
QBASIC.EXE	O
with	O
the	O
/EDITOR	O
and	O
/QHELP	O
switches	O
(	O
i.e.	O
,	O
command	O
lines	O
QBASIC	B-Language
/EDITOR	O
and	O
QBASIC	B-Language
/QHELP	O
)	O
.	O
</s>
<s>
QBasic	B-Language
came	O
complete	O
with	O
four	O
pre-written	O
example	O
programs	O
.	O
</s>
<s>
These	O
were	O
Nibbles	B-Application
,	O
a	O
variant	O
of	O
the	O
Snake	B-Application
game	I-Application
;	O
Gorillas	B-Application
,	O
an	O
artillery	B-Application
game	I-Application
;	O
MONEY	B-Application
MANAGER	I-Application
,	O
a	O
personal	O
finance	O
manager	O
;	O
and	O
RemLine	O
,	O
a	O
Q-BASIC	B-Language
code	O
line-number-removing	O
program	O
.	O
</s>
<s>
QBasic	B-Language
has	O
an	O
Easter	O
egg	O
accessed	O
by	O
pressing	O
and	O
holding	O
simultaneously	O
after	O
running	O
QBasic	B-Language
at	O
the	O
DOS	O
prompt	O
but	O
before	O
the	O
title	O
screen	O
loads	O
:	O
this	O
lists	O
The	O
Team	O
of	O
programmers	O
.	O
</s>
