Commodore 16 User Manual
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Now add the
other letters'.
10 PRINT
"COMMODORE"
3. YOU CAN ERASE CHARACTERS AND CLOSE UP SPACE
with
Ihe
DEL Key (gel
delete
by
pressing
the INST/DEL
key
by
itself). This
key
erases characters or
spaces
immediately
to
the LEFT ol the
cursor.
10 PRINT "AFTERNOON SCHEDULE"
You can change this
lo
WEEKLY
SCHEDULE by
moving
the
cursor
to
Ihe
E
in AFTERNOON, pressing Ihe msT/DFZ key three times, and
typing WHDO.Y
10 PRINT "AFTERNOON
SCHEDULE"
and press
inst/del three times
10 PRINT "QRNOON SCHEDULE" Type in WEEKLY to replace
ERNOON ann (
i
return
4. YOU CAN RETYPE A LINE anytime, even after you've RUN the pro-
gram
Your
Commodore 1 6
automatically replaces
the old
line
with
Ihe new
one
when
you
press
return lo
enter
the
new line. The
old
tine still appears on the screen,
but
your computer ignores it. When
you have two statements with the same line number, your Commo-
dore
1B only uses the last one
entered. For
example, in a brief
pro-
gram using the
COLOR
command
to change
the colour
ol the screen
background,
a
mistake might occur:
10 COKOR 0,3 mistake
20 PRINT "COMMODORE
16"
Press the etuiui key
to
gel
to a
fresh line, and just
retype line 10
correctly
10 COLOR
0,3
Now Ihe
first
line
1 is replaced
by the second line 1 0. You
can
check
48
I
I
this by
typing
UST.
which displays a
ilne-by-line LISTing of your
program
as it
is stored in the
computer's memory. When you
LIST
a
program, all lines
appear In correct
order
and
the replaced lines don't
appear
The screen reads:
LIST RETURN
10 COLOR 0,3
20 PRINT
"COMMODORE
16"
You can see what the COLOR
command does In
this example. For a
more complete
explanation,
see
Chapter
6, or
look
up
COLOR
in
Ihe
BASIC
Encyclopedia.
Replacing lines In a program
is also
a
good way to
experiment with
your
computer When
you
replace a line, the
new one doesn't have to
be anything
like
Ihe old
line. For example,
instead ot correcting Ihe
spelling of
COLOR, you can
enter
this
line:
10
PRINT'COMMODORE 4 TIMES
COMMODORE 4
«^'
\
space
Now RUN the program
anc
see what
happens.
5. YOU CAN ERASE
AN UNWANTED LINE just by
typing the
number
of the
line and pressing HETuWi
The computer
ignores the line
even Ihough it
still appears on
the screen Type UST to get
tne pro-
gram LISTing to
make
sure
the line is gone from Ihe
program.
10 PRINT
"COMMODORE 4 TIMES
COMMODORE 4
-
"
20
PRINT "COMMODORE
16"
Now
type
10
UST
RETURN
The
result, according to your
computer
20 PRINT
"COMMODORE
16"
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