<s>
Programmed	O
Inquiry	O
,	O
Learning	O
,	O
or	O
Teaching	O
(	O
PILOT	O
)	O
is	O
a	O
simple	O
high-level	B-Language
programming	I-Language
language	I-Language
developed	O
in	O
the	O
1960s	O
.	O
</s>
<s>
Like	O
its	O
younger	O
sibling	O
LOGO	B-Device
,	O
it	O
was	O
an	O
early	O
foray	O
into	O
the	O
technology	O
of	O
computer-assisted	O
instruction	O
.	O
</s>
<s>
PILOT	O
is	O
an	O
imperative	B-Application
language	I-Application
similar	O
in	O
structure	O
to	O
BASIC	B-Language
and	O
FORTRAN	B-Application
in	O
its	O
basic	B-Language
layout	O
and	O
structure	O
.	O
</s>
<s>
Its	O
keywords	O
are	O
single	O
characters	O
,	O
T	O
for	O
"	O
type	O
"	O
to	O
print	O
text	O
,	O
or	O
A	O
for	O
"	O
accept	O
"	O
,	O
to	O
input	B-General_Concept
values	O
from	O
the	O
user	O
.	O
</s>
<s>
Starting	O
in	O
1968	O
,	O
he	O
developed	O
a	O
follow-on	O
project	O
called	O
PILOT	O
,	O
for	O
various	O
computers	O
of	O
the	O
time	O
such	O
as	O
the	O
SDS	B-Device
940	I-Device
.	O
</s>
<s>
A	O
line	O
of	O
PILOT	O
code	O
contains	O
(	O
from	O
left	O
to	O
right	O
)	O
the	O
following	O
syntax	B-Application
elements	O
:	O
</s>
<s>
an	O
operand	O
,	O
or	O
multiple	O
operands	O
delimited	B-Algorithm
by	O
commas	O
.	O
</s>
<s>
The	O
syntax	B-Application
for	O
a	O
label	O
is	O
an	O
asterisk	O
followed	O
by	O
an	O
identifier	O
(	O
alphanumeric	O
string	O
with	O
alphabetic	O
initial	O
character	O
)	O
.	O
</s>
<s>
A	O
Accept	O
input	B-General_Concept
into	O
"	O
accept	O
buffer	B-General_Concept
"	O
.	O
</s>
<s>
C	O
Compute	O
and	O
assign	O
numeric	B-Algorithm
value	O
.	O
</s>
<s>
Most	O
PILOT	O
implementations	O
have	O
only	O
integer	O
arithmetic	O
,	O
and	O
no	O
arrays	B-Data_Structure
.	O
</s>
<s>
M	O
Match	O
the	O
accept	O
buffer	B-General_Concept
against	O
string	O
variables	O
or	O
string	B-Language
literals	I-Language
.	O
</s>
<s>
The	O
first	O
match	O
string	O
(	O
if	O
any	O
)	O
that	O
is	O
a	O
substring	O
of	O
the	O
accept	O
buffer	B-General_Concept
is	O
assigned	O
to	O
the	O
special	O
variable	O
$MATCH	O
.	O
</s>
<s>
The	O
buffer	B-General_Concept
characters	O
left	O
of	O
the	O
first	O
match	O
are	O
assigned	O
to	O
$LEFT	O
,	O
and	O
the	O
characters	O
on	O
the	O
right	O
are	O
assigned	O
to	O
$RIGHT	O
.	O
</s>
<s>
Parentheses	O
If	O
there	O
is	O
a	O
parenthesized	O
expression	O
in	O
a	O
statement	O
,	O
it	O
is	O
a	O
conditional	B-Language
expression	O
,	O
and	O
the	O
statement	O
is	O
processed	O
only	O
if	O
the	O
test	O
has	O
a	O
value	O
of	O
'	O
true	O
 '	O
.	O
</s>
<s>
Extensions	O
to	O
core	O
PILOT	O
include	O
arrays	B-Data_Structure
and	O
floating	B-Algorithm
point	I-Algorithm
numbers	I-Algorithm
in	O
Apple	B-Device
PILOT	O
,	O
and	O
implementation	O
of	O
LOGO-inspired	O
turtle	B-Application
graphics	I-Application
in	O
Atari	B-Device
PILOT	O
.	O
</s>
<s>
Versions	O
of	O
PILOT	O
overlaid	O
on	O
the	O
BASIC	B-Language
interpreters	O
of	O
early	O
microcomputers	O
were	O
not	O
unknown	O
in	O
the	O
late	O
1970s	O
and	O
early	O
1980s	O
,	O
and	O
Byte	O
Magazine	O
at	O
one	O
point	O
published	O
a	O
non-Turing	O
complete	O
derivative	O
of	O
PILOT	O
known	O
as	O
Waduzitdo	O
by	O
Larry	O
Kheriarty	O
as	O
a	O
way	O
of	O
demonstrating	O
what	O
a	O
computer	O
was	O
capable	O
of	O
.	O
</s>
<s>
PETPILOT	O
(	O
PILOT	O
for	O
the	O
Commodore	O
PET	O
)	O
was	O
the	O
first	O
non-Commodore	O
language	O
for	O
the	O
PET	O
and	O
was	O
written	O
in	O
Microsoft	O
BASIC	B-Language
which	O
shipped	O
with	O
the	O
PET	O
,	O
with	O
a	O
little	O
assistance	O
from	O
Bill	O
Gates	O
.	O
</s>
<s>
1983	O
's	O
Vanilla	O
PILOT	O
for	O
the	O
Commodore	O
64	O
added	O
turtle	B-Application
graphics	I-Application
,	O
as	O
did	O
Super	O
Turtle	O
PILOT	O
which	O
was	O
published	O
as	O
a	O
type-in	O
listing	O
in	O
the	O
October	O
1987	O
issue	O
of	O
COMPUTE	O
!	O
</s>
<s>
In	O
1990	O
eSTeem	O
PILOT	O
for	O
Atari	B-Device
ST	O
computers	O
was	O
developed	O
and	O
programmed	O
by	O
Tom	O
Nielsen	O
,	O
EdD	O
.	O
</s>
<s>
Based	O
on	O
the	O
IEEE	O
Standards	O
for	O
PILOT	O
,	O
it	O
includes	O
Atari-specific	O
features	O
such	O
as	O
control	O
of	O
Laserdisc	O
and	O
CDROM	O
devices	O
.	O
</s>
