<s>
ABC	B-Language
is	O
an	O
imperative	B-Application
general-purpose	O
programming	O
language	O
and	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	O
)	O
developed	O
at	O
Centrum	O
Wiskunde	O
&	O
Informatica	O
(	O
CWI	O
)	O
,	O
Netherlands	O
by	O
Leo	O
Geurts	O
,	O
Lambert	O
Meertens	O
,	O
and	O
Steven	O
Pemberton	O
.	O
</s>
<s>
It	O
is	O
interactive	O
,	O
structured	B-Language
,	O
high-level	B-Language
,	O
and	O
intended	O
to	O
be	O
used	O
instead	O
of	O
BASIC	O
,	O
Pascal	B-Application
,	O
or	O
AWK	B-Application
.	O
</s>
<s>
ABC	B-Language
had	O
a	O
major	O
influence	O
on	O
the	O
design	O
of	O
the	O
language	O
Python	B-Language
,	O
developed	O
by	O
Guido	O
van	O
Rossum	O
,	O
who	O
formerly	O
worked	O
for	O
several	O
years	O
on	O
the	O
ABC	B-Language
system	O
in	O
the	O
mid-1980s	O
.	O
</s>
<s>
Its	O
designers	O
claim	O
that	O
ABC	B-Language
programs	O
are	O
typically	O
around	O
a	O
quarter	O
the	O
size	O
of	O
the	O
equivalent	O
Pascal	B-Application
or	O
C	B-Language
programs	I-Language
,	O
and	O
more	O
readable	O
.	O
</s>
<s>
ABC	B-Language
was	O
originally	O
a	O
monolithic	B-General_Concept
implementation	I-General_Concept
,	O
leading	O
to	O
an	O
inability	O
to	O
adapt	O
to	O
new	O
requirements	O
,	O
such	O
as	O
creating	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
.	O
</s>
<s>
ABC	B-Language
could	O
not	O
directly	O
access	O
the	O
underlying	O
file	B-Application
system	I-Application
and	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
The	O
full	O
ABC	B-Language
system	O
includes	O
a	O
programming	B-Application
environment	I-Application
with	O
a	O
structure	B-Application
editor	I-Application
(	O
syntax-directed	B-Application
editor	I-Application
)	O
,	O
suggestions	O
,	O
static	B-General_Concept
variables	I-General_Concept
(	O
persistent	O
)	O
,	O
and	O
multiple	O
workspaces	O
,	O
and	O
is	O
available	O
as	O
an	O
interpreter	B-Application
–	O
compiler	B-Language
.	O
</s>
<s>
,	O
the	O
latest	O
version	O
is	O
1.05.02	O
,	O
and	O
it	O
is	O
ported	O
to	O
Unix	B-Application
,	O
DOS	B-Device
,	O
Atari	O
,	O
and	O
Apple	O
MacOS	B-Application
.	O
</s>
