<s>
Snostorm	B-Language
(	O
Snostorm3	O
)	O
is	O
a	O
version	O
of	O
the	O
SNOBOL4	B-Application
language	O
with	O
structured	B-Language
programming	I-Language
constructs	O
added	O
.	O
</s>
<s>
It	O
compensates	O
for	O
the	O
near	O
absence	O
of	O
structured	B-Language
programming	I-Language
constructs	O
in	O
SNOBOL4	B-Application
by	O
providing	O
IF	O
,	O
ELSEIF	O
,	O
ELSE	O
,	O
LOOP	O
,	O
CASE	O
,	O
and	O
PROCEDURE	O
statements	O
,	O
among	O
others	O
.	O
</s>
<s>
It	O
was	O
originally	O
designed	O
and	O
implemented	O
by	O
Fred	O
G	O
.	O
Swartz	O
as	O
a	O
preprocessor	O
for	O
SPITBOL	B-Application
running	O
under	O
the	O
Michigan	B-Application
Terminal	I-Application
System	I-Application
(	O
MTS	O
)	O
at	O
the	O
University	O
of	O
Michigan	O
Computing	O
Center	O
during	O
the	O
1970s	O
.	O
</s>
<s>
In	O
addition	O
MTS	O
Snostorm	B-Language
provided	O
options	O
for	O
prettyprinting	B-Application
and	O
for	O
debugging	O
with	O
the	O
Spitbol	B-Application
compiler	I-Application
.	O
</s>
<s>
The	O
syntax	O
of	O
Snostorm	B-Language
is	O
largely	O
insensitive	O
to	O
spaces	O
and	O
newlines	O
,	O
but	O
not	O
entirely	O
so	O
because	O
of	O
its	O
dependence	O
upon	O
SNOBOL4	B-Application
for	O
execution	O
.	O
</s>
<s>
A	O
SNOBOL4	B-Application
program	O
as	O
given	O
in	O
The	O
SNOBOL4	B-Application
Programming	O
Language	O
by	O
Griswold	O
,	O
Poage	O
,	O
and	O
Polonsky	O
followed	O
by	O
the	O
same	O
program	O
rewritten	O
in	O
Snostorm	B-Language
.	O
</s>
<s>
The	O
original	O
SNOBOL4	B-Application
program	O
.	O
</s>
<s>
The	O
same	O
program	O
,	O
rewritten	O
in	O
Snostorm	B-Language
.	O
</s>
<s>
In	O
addition	O
to	O
its	O
use	O
at	O
the	O
eight	O
to	O
fifteen	O
sites	O
that	O
ran	O
the	O
Michigan	B-Application
Terminal	I-Application
System	I-Application
,	O
a	O
Snostorm3	O
compiler	O
existed	O
at	O
University	O
College	O
London	O
(	O
UCL	O
)	O
from	O
1982	O
to	O
1984	O
and	O
worked	O
by	O
compiling	O
Snostorm3	O
into	O
SNOBOL4	B-Application
,	O
which	O
could	O
then	O
be	O
executed	O
using	O
the	O
SNOBOL4	B-Application
interpreter	O
or	O
by	O
using	O
a	O
SPITBOL	B-Application
compiler	I-Application
to	O
create	O
an	O
executable	O
.	O
</s>
