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15 LPRINT CHR$(27);“D”;CHR$(7);CHR$(l4);CHR$(21);
CHRS(O) ;
(ESC)“D” is the command to begin setting horizontal tabs. It
must be followed by characters representing the positions that
you want the tabs set. In our program we are setting tabs in col-
umns 7, 14, and 21. The CHR$(O) at the end ends the string of
tabs. In fact, any character that is not greater than the previous
one will stop setting tabs. This means that you must put all your
tab values in order, from least to greatest, or they won’t all get
set.
When you run the program now it produces this:
ONE
TWO THREE FOUR
The words are now closer together, but still evenly spaced.
To reset the default tabs, use the following program:
LPRINT CHR$ (27) ; “eO”CHR$ (8)
This command sets the horizontal tab to every eight columns.
Table 6-6
Horizontal tab commands
Function
Advance to next tab position
Set tabs at nl, n2, etc.
Control code
CHR$@)
(ESC)“D”CHR$(nl)
CHR$(nZ).....CHR$(O)
Set tabs every n columns
(ESC) “e” 0 CHR$(n)
n One-time horizontal tabs
Suppose you need to move to a position across the page, but
you only need to do it once. It doesn’t make much sense to set
up a tab to use only one time. There must be an easier way -
and of course there is.
The solution is called a one-time tab. Table 6-7 show the three
commands.