Entering
and
Editing
3-4
L Subcommand The L subcommand prints the rest
of
the original line, and waits for further editing
subcommands. The cursor
is
to the left
of
the first character. You can use the L sub-
command
to
display previously edited text and restart editing at the beginning
of
the
line:
40
IF
A>B
THEN
120
ELSE
"NULL
SET"
40.
I Subcommand The I subcommand inserts characters after the last character typed. Each character
typed after typing I
is
inserted
at
the current cursor position. To end insertion, press
the ESCAPE key. To end insertion and leave the Editing Mode, press the Carriage
Return key. Characters may be deleted when using the I subcommand by pressing
the RUBOUT key.
The syntax
of
the I subcommand
is:
I character [character] ...
Suppose you want
to
insert the word
"PRINT"
into the previous example. Press the
space bar until you reach the proper point:
40
IF
A>B
THEN
120
ELSE.
and then enter:
(I) PRINT (ESC) (L)
And you will see:
40
IF
A>B
THEN
120
ELSE PRINT
"NULL
SET"
H Subcommand The H Subcommand deletes all characters to the right
of
the cursor, and then enters
the insertion mode, like the I Subcommand. When through inserting characters,
enter (ESC) to end insertion
or
(CR) to end editing.
The syntax
of
the H subcommand
is:
H Character[Character] ...
If
you want to change the message
"NULL
SET"
in the previous example to
"UNDEFINED
SET",
you can use the H Subcommand to do it. Move the cursor to
the proper point with the space bar:
40
IF
A>B
THEN
120
ELSE PRINT
Enter (H) "UNDEFINED
SET"
(ESC) (L):
40
IF
A>B
THEN
120
ELSE PRINT "UNDEFINED
SET"
X Subcommand The X subcommand prints the rest
of
the line to be edited, moves the cursor to the
end
of
the line, and enters the insertion mode; as for the I subcommand. This sub-
command is used
to
add new text
at
the end
of
instruction lines. Execution
is
as in
the insertion mode.
BASIC-80