<s>
Web	O
is	O
a	O
computer	B-General_Concept
programming	I-General_Concept
system	O
created	O
by	O
Donald	O
E	O
.	O
Knuth	O
as	O
the	O
first	O
implementation	O
of	O
what	O
he	O
called	O
"	O
literate	B-Application
programming	I-Application
"	O
:	O
the	O
idea	O
that	O
one	O
could	O
create	O
software	O
as	O
works	O
of	O
literature	O
,	O
by	O
embedding	O
source	O
code	O
inside	O
descriptive	O
text	O
,	O
rather	O
than	O
the	O
reverse	O
(	O
as	O
is	O
common	O
practice	O
in	O
most	O
programming	O
languages	O
)	O
,	O
in	O
an	O
order	O
that	O
is	O
convenient	O
for	O
exposition	O
to	O
human	O
readers	O
,	O
rather	O
than	O
in	O
the	O
order	O
demanded	O
by	O
the	O
compiler	B-Language
.	O
</s>
<s>
Web	O
consists	O
of	O
two	O
secondary	O
programs	O
:	O
TANGLE	O
,	O
which	O
produces	O
compilable	O
Pascal	B-Application
code	O
from	O
the	O
source	O
texts	O
,	O
and	O
WEAVE	O
,	O
which	O
produces	O
nicely-formatted	O
,	O
printable	O
documentation	O
using	O
TeX	B-Application
.	O
</s>
<s>
CWEB	B-Application
is	O
a	O
version	O
of	O
Web	O
for	O
the	O
C	B-Language
programming	I-Language
language	I-Language
,	O
while	O
noweb	B-Application
is	O
a	O
separate	O
literate	B-Application
programming	I-Application
tool	O
,	O
which	O
is	O
inspired	O
by	O
Web	O
(	O
as	O
reflected	O
in	O
the	O
name	O
)	O
and	O
which	O
is	O
language	B-Language
agnostic	I-Language
.	O
</s>
<s>
The	O
most	O
significant	O
programs	O
written	O
in	O
Web	O
are	O
TeX	B-Application
and	O
Metafont	B-Operating_System
.	O
</s>
<s>
Modern	O
TeX	B-Application
distributions	O
use	O
another	O
program	O
Web2C	B-General_Concept
to	O
convert	O
Web	O
source	O
to	O
C	B-Language
.	O
</s>
<s>
Unlike	O
most	O
other	O
documentation	B-Protocol
generators	I-Protocol
which	O
relegate	O
documentation	O
to	O
comments	O
,	O
the	O
WEB	O
approach	O
is	O
to	O
write	O
an	O
article	O
to	O
document	O
the	O
making	O
of	O
the	O
source	O
code	O
.	O
</s>
<s>
Much	O
like	O
TeX	B-Application
articles	O
,	O
the	O
source	O
is	O
divided	O
into	O
sections	O
according	O
to	O
documentation	O
flow	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
CWEB	B-Application
,	O
code	O
sections	O
are	O
seamlessly	O
intermixed	O
in	O
the	O
line	O
of	O
argumentation	O
.	O
</s>
<s>
CWEB	B-Application
is	O
a	O
computer	B-General_Concept
programming	I-General_Concept
system	O
created	O
by	O
Donald	O
Knuth	O
and	O
Silvio	O
Levy	O
as	O
a	O
follow-up	O
to	O
Knuth	O
's	O
WEB	O
literate	B-Application
programming	I-Application
system	O
,	O
using	O
the	O
C	B-Language
programming	I-Language
language	I-Language
(	O
and	O
to	O
a	O
lesser	O
extent	O
the	O
C++	B-Language
and	O
Java	B-Language
programming	I-Language
languages	I-Language
)	O
instead	O
of	O
Pascal	B-Application
.	O
</s>
<s>
Like	O
WEB	O
,	O
it	O
consists	O
of	O
two	O
primary	O
programs	O
:	O
CTANGLE	O
,	O
which	O
produces	O
compilable	O
C	B-Language
code	O
from	O
the	O
source	O
texts	O
,	O
and	O
CWEAVE	O
,	O
which	O
produces	O
nicely-formatted	O
printable	O
documentation	O
using	O
TeX	B-Application
.	O
</s>
<s>
Can	O
enter	O
manual	O
TeX	B-Application
code	O
as	O
well	O
as	O
automatic	O
.	O
</s>
<s>
Make	O
formatting	O
of	O
C	B-Language
code	O
for	O
pretty	B-Application
printing	I-Application
.	O
</s>
<s>
Write	O
the	O
header	O
code	O
and	O
main	O
C	B-Language
code	O
in	O
one	O
file	O
,	O
and	O
can	O
reuse	O
the	O
same	O
sections	O
,	O
and	O
then	O
it	O
can	O
be	O
tangled	O
into	O
multiple	O
files	O
for	O
compiling	B-Language
.	O
</s>
<s>
Change	O
files	O
,	O
which	O
can	O
be	O
automatically	O
merged	O
into	O
the	O
code	O
when	O
compiling/printing	O
.	O
</s>
