If
you
type
words
or
characters
that
are
not
in
the computer's vocabulary and press RETURN,
the
computer
won't
know
what
it
is
supposed
to
do. Right
now
you
have a series
of
letters
on
your
screen from
the
previous exercises. But this
series
of
letters
is
not
a.BAS/C command.
Try
pressing the
RETURN
key.
The computer an-
swers
with
the
word
ERROR
.
It
also displays
whatever
characters
you
typed before
you
pressed
RETURN.
SCREEN
1
~
Whenever the computer displays the
ERROR
message,
it
also shows
you
whatever
you
typed
that
it
didn
't understand
as
a command. That
helps
you
change
your
message
to
one the com-
puter
can follow.
In the section on using the
BASIC
language,
you'll
see
what
happens
when
you
use the
RE-
TURN key
to
send proper
BASIC
commands
to
the computer.
Though the
RETURN key also moves
the
cursor
to
the beginning
of
the next jine, this
is
different
from
wraparound
.
RETURN
ends a line even
if
there
is
still room for more characters, and
the
computer recognizes
it
as
a true line Change.
RETURN also lets
you
end a line
which
contains
no characters.
Press
RETURN
again. The cursor
just
moves
down
a line because there was no
message in the previous line
to
respond to.
SCREEN
2
60
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