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Formatting Your Output
59
at line 20, a (VT) (or vertical tab) will move you to line 20 whether
you start from line 5 or line 19.
The default vertical tab settings are every six lines. If you send
a CHR$(ll), which is the ASCII code for (VT), before we have set
up tabs it will advance the paper to one of these preset tabs. Enter
this program to see how this works.
NEW
2pl LPRINT CHRfJ(1.1) "FIRST TAB"
3@ LPRINT CHR$(ll) "SECOND TAB"
40 LPRINT CHR$(ll) "THIRD TAB"
50 LPRINT CHR$(ll) "FOURTH TAB"
The CHR$(ll) in each line advances the paper to the next
vertical tab. The lines should be spaced evenly, six lines apart.
Now let’s set some vertical tabs of our own. Add this line to
the program:
10 LPRINT CHR$(27) "P" CHR$(l@ CHR$(Z@) CHR$(@)
CHR$(50) CHR$(PI);
(ESC) “P” is the command to set vertical tabs. Like the hori-
zontal tab setting command, tab positions must be defined in
ascending order. Our example sets vertical tabs at lines 10, 20,40
and 50. Then the CHR$(ll) in each of the following lines advances
the paper to the next vertical tab. Figure 5-l is what you get.
Add one more line to the program to demonstrate one more
feature of vertical tabs.
60 LPRINT CHR$(ll) "FIFTH TAB"
Now when you run the program the first page looks just like
before, but line 60 sends one more (VT) than there are tabs. This
doesn’t confuse Delta-it advances the paper to the next tab posi-
tion which happens to be the first tab position on the next page.
That’s nice, isn’t it?