Radio Shack TRS-80 User Manual page 16

"Why
didn't the
word
END
print?"
Answer: Because nothing
is
printed unless
it is
the
"object" of
a
PRINT
statement.
So
how
could
we
get
the
Computer
to print
THE END
at
the
end of the
program
execution?
Think
for a
minute before reading on.
98
PRINT " THE END
"
Erasing
Without Replacing
Just for fun,
let's
move
the
END
statement from
line
99 to the
largest
usable line
number,
32767. This requires
two
steps.
The
first
is
to erase line 99.
Note
that we're
not
just
making
a change or correcting
an
error
in line
99
—
we want
to
completely
eliminate
it
from
the
program.
Easier
done than
said:
Type:
99
Then
nana
The
line
is
erased.
How
can
we
be sure?
Think about
this
now. Got
it???
Sure
—
"pull"
a
LIST of the
entire
program by
typing
list
BZQ3D
The screen should
show
the program
with
lines 5,
10, 15,
20 and
98. .99
should be gone.
Any
entire line
can be erased the
same way.
The
second
step
is
just as easy.
Type
32767 END MJHHil
. .
.
and
the
new
line
is
entered. Pull a listing
of the
program
to see
if
it
was.
Was
it???
Now
RUN
the
program
to see
if
moving
the
END
statement changed
anything.
Did
it???
It
shouldn't have.
Other Uses
for
END
Move END
from
#32767
to line
#17, then
RUN. What
happened?
It
ENDed
the
RUN
after
printing
line
10
and a space.
RUNit
several
times.
Now moveENDto
line
13 and
RUN
.
Then
to line
8
and
RUN. Do you
see the effect
END
has,
depending where
it is
placed (even temporarily)
in a
program?
14
This will
work
if line
#98
is
th&
last
PEINT
statement
in
yautprc^raKi.