<s>
TRAC	B-Language
(	O
for	O
Text	O
Reckoning	O
And	O
Compiling	O
)	O
Language	O
is	O
a	B-Language
programming	I-Language
language	I-Language
developed	O
between	O
1959	O
–	O
1964	O
by	O
Calvin	O
Mooers	O
and	O
first	O
implemented	O
on	O
the	O
PDP-1	B-Device
in	O
1964	O
by	O
L	O
.	O
Peter	O
Deutsch	O
.	O
</s>
<s>
TRAC	B-Language
T64	O
was	O
used	O
until	O
at	O
least	O
1984	O
,	O
when	O
Mooers	O
updated	O
it	O
to	O
TRAC	B-Language
T84	O
.	O
</s>
<s>
TRAC	B-Language
is	O
a	O
purely	O
text-based	O
language	O
—	O
a	O
kind	O
of	O
macro	B-Application
language	I-Application
.	O
</s>
<s>
Unlike	O
traditional	O
ad	O
hoc	O
macro	O
languages	O
of	O
the	O
time	O
,	O
such	O
as	O
those	O
found	O
in	O
assemblers	O
,	O
TRAC	B-Language
is	O
well	O
planned	O
,	O
consistent	O
,	O
and	O
in	O
many	O
senses	O
complete	O
.	O
</s>
<s>
It	O
also	O
differs	O
from	O
traditional	O
macro	O
languages	O
in	O
that	O
TRAC	B-Language
numbers	O
are	O
strings	O
of	O
digits	O
,	O
with	O
integer	O
arithmetic	O
(	O
without	O
specific	O
limits	O
on	O
maximum	O
values	O
)	O
being	O
provided	O
through	O
built-in	O
(	O
"	O
primitive	O
"	O
)	O
functions	O
.	O
</s>
<s>
Arguably	O
,	O
one	O
aspect	O
of	O
its	O
completeness	O
is	O
that	O
the	O
concept	O
of	O
error	O
is	O
limited	O
to	O
events	O
like	O
lack	O
of	O
file	O
space	O
and	O
requesting	O
expansion	O
of	O
a	O
string	O
longer	O
than	O
the	O
interpreter	O
's	O
working	O
storage	O
;	O
what	O
would	O
in	O
many	O
languages	O
be	O
described	O
as	O
illegal	O
operations	O
are	O
dealt	O
with	O
in	O
TRAC	B-Language
by	O
defining	O
a	O
result	O
(	O
often	O
a	O
null	O
string	O
)	O
for	O
every	O
possible	O
combination	O
of	O
a	O
function	O
's	O
argument	O
strings	O
.	O
</s>
<s>
TRAC	B-Language
is	O
a	O
text-processing	O
language	O
,	O
</s>
<s>
The	O
emphasis	O
on	O
strings	O
as	O
strings	O
is	O
so	O
strong	O
that	O
TRAC	B-Language
provides	O
mechanisms	O
for	O
handling	O
the	O
language	O
's	O
own	O
syntactic	O
characters	O
either	O
in	O
their	O
syntactic	O
roles	O
or	O
like	O
any	O
other	O
character	O
,	O
and	O
self-modifying	B-Application
code	I-Application
has	O
more	O
the	O
feel	O
of	O
a	O
natural	O
consequence	O
of	O
typical	O
TRAC	B-Language
programming	O
techniques	O
than	O
of	O
being	O
a	O
special	O
feature	O
.	O
</s>
<s>
TRAC	B-Language
is	O
,	O
like	O
APL	B-Language
or	O
LISP	B-Language
,	O
an	O
expression	O
oriented	O
language	O
(	O
in	O
contrast	O
to	O
more	O
typical	O
procedure-oriented	B-Application
languages	I-Application
)	O
,	O
but	O
unlike	O
APL	B-Language
,	O
it	O
completely	O
lacks	O
operators	O
.	O
</s>
<s>
In	O
most	O
respects	O
,	O
it	O
is	O
a	O
case	O
of	O
pure	O
functional	B-Language
programming	I-Language
.	O
</s>
<s>
TRAC	B-Language
is	O
homoiconic	O
.	O
</s>
<s>
TRAC	B-Language
has	O
in	O
common	O
with	O
LISP	B-Language
a	O
syntax	O
that	O
generally	O
involves	O
the	O
presence	O
of	O
many	O
levels	O
of	O
nested	O
parentheses	O
.	O
</s>
<s>
The	O
main	O
inspiration	O
for	O
TRAC	B-Language
came	O
from	O
three	O
papers	O
by	O
Douglas	O
McIlroy	O
.	O
</s>
<s>
Mooers	O
trademarked	O
the	O
name	O
TRAC	B-Language
in	O
an	O
effort	O
to	O
maintain	O
his	O
control	O
over	O
the	O
definition	O
of	O
the	O
language	O
,	O
an	O
unusual	O
and	O
pioneering	O
action	O
at	O
the	O
time	O
.	O
</s>
<s>
At	O
one	O
point	O
,	O
he	O
brought	O
an	O
intellectual	O
property	O
infringement	O
suit	O
against	O
DEC	O
,	O
alleging	O
that	O
a	O
contract	O
to	O
deliver	O
a	O
mini-computer	O
with	O
a	O
TRAC	B-Language
interpreter	O
violated	O
his	O
rights	O
.	O
</s>
<s>
The	O
name	O
has	O
since	O
been	O
used	O
several	O
times	O
for	O
unrelated	O
information	B-General_Concept
technology	I-General_Concept
projects	O
,	O
including	O
a	O
current	O
open	B-Application
source	I-Application
project	O
management	O
system	O
called	O
Trac	B-Language
.	O
</s>
<s>
TRAC	B-Language
was	O
later	O
implemented	O
on	O
the	O
PDP-8	B-Device
,	O
PDP-10	B-Device
,	O
and	O
PDP-11	B-Device
.	O
</s>
<s>
There	O
have	O
been	O
various	O
languages	O
inspired	O
by	O
TRAC	B-Language
.	O
</s>
<s>
In	O
SAM76	O
's	O
case	O
,	O
primitives	O
were	O
added	O
,	O
according	O
to	O
Claude	O
Kagan	O
,	O
"	O
because	O
TRAC	B-Language
is	O
baby	O
talk	O
"	O
.	O
</s>
<s>
one	O
perceived	O
shortcoming	O
of	O
TRAC	B-Language
was	O
lack	O
of	O
full	O
extensibility	O
:	O
some	O
TRAC	B-Language
primitive	O
functions	O
are	O
sensitive	O
to	O
the	O
distinction	O
between	O
a	O
null	O
(	O
zero-character	O
)	O
argument	O
and	O
a	O
nonexistent	O
(	O
non-delimited	O
)	O
one	O
,	O
but	O
beyond	O
its	O
last	O
non-null	O
argument	O
,	O
a	O
user-defined	O
function	O
cannot	O
make	O
the	O
distinction	O
.	O
</s>
<s>
SAM76	O
was	O
a	O
TRAC-like	O
language	O
which	O
eliminated	O
that	O
limitation	O
.	O
</s>
<s>
Russ	O
Nelson	O
implemented	O
an	O
emacs	B-Application
extension	O
language	O
named	O
MINT	O
(	O
MINT	O
Is	O
Not	O
TRAC	B-Language
)	O
.	O
</s>
<s>
This	O
language	O
is	O
used	O
by	O
the	O
FreeDOS	B-Application
editor	O
FreeMACS	B-Application
.	O
</s>
<s>
TRAC	B-Language
was	O
used	O
by	O
FTP	O
Software	O
in	O
its	O
PC/TCP	O
product	O
as	O
the	O
modem	O
dialer	O
scripting	O
language	O
.	O
</s>
<s>
TRAC	B-Language
was	O
also	O
used	O
as	O
a	O
front	O
end	O
on	O
Digital	O
Productions	O
Cray	O
renderer	O
for	O
films	O
,	O
including	O
The	B-Device
Last	I-Device
Starfighter	I-Device
.	O
</s>
<s>
TRAC	B-Language
T84	O
script	O
to	O
compute	O
Fibonacci	O
numbers	O
:	O
</s>
