51
W 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 is an easier way.
The solution is called a one-time tab. Table 4-8 shows the
three commands.
Table 4-8
One-time horzontal tabs
Function Control code
One-time horizontal tab of n
spaces (ESC) “f” 0 CHR$(n)
Absolute horizontal tab (ESC) “$” CHR$(nl) CHR$(nZ)
Relative horizontal tab (ESC) ‘I\” CHR$(nl) CHR$(n2)
The first command in Table 4-8 moves the print head n col-
umns to the right. It has the same effect as sending n spaces to
the printer.
The absolute horizontal tab command moves the print head to
a specified position on the page. The position that you want the
print head to move to (measured from the left margin) is
specified by the values of nl and n2 using the formula nl + n2
x 256.
Try this program to see how this works.
10 ’ Demo of absolute horizontal tabs
20 FOR I=60 TO 70 STEP 2
30 LPRINT I ;“i-H+” ;
40 LPRINT CHR$(~~) ;“$“;CHR$(I) ;CHR$(O) ;
50 LPRINT “Horizontal tab. ”
60 NEXT I
70 END
In this program, the print head is positioned before the “H” in
“Horizontal” is printed.