<s>
Fortress	B-Language
is	O
a	O
discontinued	O
experimental	O
programming	O
language	O
for	O
high-performance	B-Architecture
computing	I-Architecture
,	O
created	O
by	O
Sun	O
Microsystems	O
with	O
funding	O
from	O
DARPA	O
's	O
High	O
Productivity	O
Computing	O
Systems	O
project	O
.	O
</s>
<s>
One	O
of	O
the	O
language	O
designers	O
was	O
Guy	O
L	O
.	O
Steele	O
Jr.	O
,	O
whose	O
previous	O
work	O
includes	O
Scheme	B-Language
,	O
Common	B-Language
Lisp	I-Language
,	O
and	O
Java	B-Language
.	O
</s>
<s>
The	O
name	O
"	O
Fortress	B-Language
"	O
was	O
intended	O
to	O
connote	O
a	O
secure	O
Fortran	B-Application
,	O
i.e.	O
,	O
"	O
a	O
language	O
for	O
high-performance	O
computation	O
that	O
provides	O
abstraction	O
and	O
type	O
safety	O
on	O
par	O
with	O
modern	O
programming	O
language	O
principles	O
"	O
.	O
</s>
<s>
Language	O
features	O
included	O
implicit	B-Operating_System
parallelism	I-Operating_System
,	O
Unicode	O
support	O
and	O
concrete	O
syntax	B-Application
similar	O
to	O
mathematical	O
notation	O
.	O
</s>
<s>
The	O
language	O
was	O
not	O
designed	O
to	O
be	O
similar	O
to	O
Fortran	B-Application
.	O
</s>
<s>
Syntactically	O
,	O
it	O
most	O
resembles	O
Scala	B-Application
,	O
Standard	B-Language
ML	I-Language
,	O
and	O
Haskell	B-Language
.	O
</s>
<s>
Fortress	B-Language
was	O
designed	O
from	O
the	O
outset	O
to	O
have	O
multiple	O
syntactic	O
stylesheets	O
.	O
</s>
<s>
Source	O
code	O
can	O
be	O
rendered	O
as	O
ASCII	B-Protocol
text	I-Protocol
,	O
in	O
Unicode	O
,	O
or	O
as	O
a	O
prettied	O
image	O
.	O
</s>
<s>
An	O
emacs-based	O
tool	O
called	O
fortify	O
transforms	O
ASCII-based	O
Fortress	B-Language
source	O
code	O
into	O
LaTeX	B-Application
output	O
.	O
</s>
<s>
Fortress	B-Language
was	O
also	O
designed	O
to	O
be	O
both	O
highly	O
parallel	O
and	O
have	O
rich	O
functionality	O
contained	O
within	O
libraries	O
,	O
drawing	O
from	O
Java	B-Language
.	O
</s>
<s>
Fortress	B-Language
 '	O
designers	O
made	O
its	O
syntax	B-Application
as	O
close	O
as	O
possible	O
to	O
pseudocode	B-Language
and	O
analyzed	O
hundreds	O
of	O
computer	B-General_Concept
science	I-General_Concept
and	O
mathematics	O
papers	O
,	O
courses	O
,	O
books	O
and	O
journals	O
using	O
pseudocode	B-Language
to	O
extract	O
the	O
common	O
usage	O
patterns	O
of	O
the	O
English	O
language	O
and	O
standard	O
mathematical	O
notation	O
when	O
used	O
to	O
represent	O
algorithms	O
in	O
pseudocode	B-Language
.	O
</s>
<s>
Then	O
they	O
made	O
the	O
compiler	O
trying	O
to	O
maintain	O
a	O
one-to-one	O
correspondence	O
between	O
pseudocode	B-Language
and	O
executable	B-Application
Fortress	B-Language
.	O
</s>
<s>
Fortress	B-Language
was	O
one	O
of	O
three	O
languages	O
created	O
with	O
funding	O
from	O
the	O
High	O
Productivity	O
Computing	O
Systems	O
project	O
;	O
the	O
others	O
were	O
X10	B-Language
from	O
IBM	O
and	O
Chapel	B-Language
from	O
Cray	O
,	O
Inc	O
.	O
</s>
<s>
In	O
November	O
2006	O
,	O
when	O
DARPA	O
approved	O
funding	O
for	O
the	O
third	O
phase	O
of	O
the	O
HPCS	O
project	O
,	O
X10	B-Language
and	O
Chapel	B-Language
were	O
funded	O
,	O
but	O
Fortress	B-Language
was	O
not	O
,	O
leading	O
to	O
uncertainty	O
about	O
the	O
future	O
of	O
Fortress	B-Language
.	O
</s>
<s>
In	O
January	O
2007	O
,	O
Fortress	B-Language
was	O
released	O
as	O
open-source	O
.	O
</s>
<s>
Version	O
1.0	O
of	O
the	O
Fortress	B-Language
Language	O
Specification	O
was	O
released	O
in	O
April	O
2008	O
,	O
along	O
with	O
a	O
compliant	O
implementation	O
targeting	O
the	O
Java	B-Language
Virtual	I-Language
Machine	I-Language
.	O
</s>
<s>
In	O
July	O
2012	O
,	O
Steele	O
announced	O
that	O
active	O
development	O
on	O
Fortress	B-Language
would	O
cease	O
after	O
a	O
brief	O
winding-down	O
period	O
,	O
citing	O
complications	O
with	O
using	O
Fortress	B-Language
's	O
type	O
system	O
on	O
existing	O
virtual	O
machines	O
.	O
</s>
<s>
This	O
is	O
the	O
Fortress	B-Language
version	O
of	O
the	O
archetypal	O
hello	O
world	O
program	O
,	O
as	O
presented	O
in	O
the	O
Fortress	B-Language
Reference	O
Card	O
:	O
</s>
<s>
The	O
export	O
statement	O
makes	O
the	O
program	O
executable	B-Application
and	O
every	O
executable	B-Application
program	I-Application
in	O
Fortress	B-Language
must	O
implement	O
the	O
run( )	O
function	O
.	O
</s>
