<s>
F	B-Language
is	O
a	O
modular	B-Architecture
,	O
compiled	O
,	O
numeric	O
programming	O
language	O
,	O
designed	O
for	O
scientific	O
programming	O
and	O
scientific	O
computation	O
.	O
</s>
<s>
F	B-Language
was	O
developed	O
as	O
a	O
modern	O
Fortran	B-Application
,	O
thus	O
making	O
it	O
a	O
subset	O
of	O
Fortran	B-Application
95	O
.	O
</s>
<s>
It	O
combines	O
both	O
numerical	O
and	O
data	B-Application
abstraction	I-Application
features	O
from	O
these	O
languages	O
.	O
</s>
<s>
F	B-Language
is	O
also	O
backwards	O
compatible	O
with	O
Fortran	B-Application
77	O
,	O
allowing	O
calls	O
to	O
Fortran	B-Application
77	O
programs	O
.	O
</s>
<s>
F	B-Language
was	O
first	O
included	O
in	O
the	O
g95	B-Application
compiler	O
.	O
</s>
<s>
F	B-Language
is	O
designed	O
to	O
be	O
a	O
minimal	O
subset	O
of	O
Fortran	B-Application
,	O
with	O
only	O
about	O
one	O
hundred	O
intrinsic	O
procedures	O
.	O
</s>
<s>
Language	O
keywords	O
and	O
intrinsic	O
function	O
names	O
are	O
reserved	O
keywords	O
in	O
F	B-Language
and	O
no	O
other	O
names	O
may	O
take	O
this	O
exact	O
form	O
.	O
</s>
<s>
F	B-Language
contains	O
the	O
same	O
character	O
set	O
used	O
in	O
Fortran	B-Application
90/95	O
with	O
a	O
limit	O
of	O
132	O
characters	O
.	O
</s>
<s>
F	B-Language
supports	O
many	O
of	O
the	O
standard	O
operators	O
used	O
in	O
Fortran	B-Application
.	O
</s>
<s>
The	O
operators	O
supported	O
by	O
F	B-Language
are	O
:	O
</s>
<s>
Similar	O
to	O
Fortran	B-Application
,	O
the	O
type	O
specification	O
is	O
made	O
up	O
of	O
a	O
type	O
,	O
a	O
list	O
of	O
attributes	O
for	O
the	O
declared	O
variables	O
,	O
and	O
the	O
variable	O
list	O
.	O
</s>
<s>
F	B-Language
provides	O
all	O
the	O
same	O
types	O
as	O
Fortran	B-Application
as	O
well	O
,	O
with	O
the	O
sole	O
exception	O
of	O
doubles	O
:	O
</s>
<s>
F	B-Language
does	O
not	O
have	O
intrinsic	O
support	O
for	O
object-oriented	B-Language
programming	I-Language
,	O
but	O
it	O
does	O
allow	O
for	O
records	O
:	O
</s>
<s>
F	B-Language
also	O
allows	O
for	O
optional	O
initialization	O
in	O
the	O
list	O
of	O
objects	O
.	O
</s>
<s>
F	B-Language
supports	O
3	O
statements	O
for	O
control	O
flow	O
:	O
if	O
,	O
a	O
basic	O
conditional	B-Language
,	O
case	O
,	O
a	O
switch	O
statement	O
,	O
and	O
do	O
,	O
a	O
conditional	B-Language
while	O
loop	O
.	O
</s>
<s>
The	O
return	O
,	O
stop	O
,	O
cycle	O
,	O
and	O
exit	O
statements	O
from	O
Fortran	B-Application
may	O
be	O
used	O
to	O
break	O
control	O
flow	O
.	O
</s>
<s>
F	B-Language
places	O
a	O
heavy	O
emphasis	O
on	O
modular	B-Architecture
programming	I-Architecture
.	O
</s>
<s>
Modules	B-Architecture
in	O
F	B-Language
are	O
called	O
"	O
programs	O
"	O
:	O
</s>
<s>
Placing	O
procedures	O
outside	O
of	O
a	O
module	B-Architecture
is	O
prohibited	O
.	O
</s>
<s>
F	B-Language
supports	O
most	O
of	O
the	O
modules	B-Architecture
and	O
subroutines	O
found	O
in	O
the	O
Fortran	B-Application
95	O
standard	O
library	O
.	O
</s>
<s>
All	O
procedures	O
in	O
F	B-Language
are	O
external	O
by	O
default	O
,	O
and	O
require	O
a	O
result	O
clause	O
that	O
returns	O
the	O
value	O
of	O
a	O
function	O
.	O
</s>
<s>
F	B-Language
supports	O
recursion	O
.	O
</s>
<s>
All	O
of	O
the	O
intrinsic	O
procedures	O
found	O
in	O
Fortran	B-Application
95	O
may	O
be	O
used	O
in	O
F	B-Language
,	O
with	O
the	O
exceptions	O
of	O
achar	O
,	O
iachar	O
,	O
lge	O
,	O
lgt	O
,	O
lle	O
,	O
llt	O
,	O
transfer	O
,	O
dble	O
,	O
dim	O
,	O
dprod	O
,	O
and	O
mod	O
.	O
</s>
