width - set the width of output lines
width #FileNum, Size
width lprint Size
Width immediately changes the width of output lines printed to the screen,
a file or the printer. The width of a device is the number of characters that
will fit on a single line of the device. To avoid printing too many characters
on a single line, the sequential output statements will interject a newline
character when necessary. Since this facility is often undesirable, it can be
turned off and the device is said to have "no width."
Size is a numeric expression which must be between zero and 255 and specifies
the new width. A Size of zero is the same as one. A Size of 255 turns the
width off. The first form of the width statement changed the width of the
screen. The second form changes the width of the file given by FileNum.
FileNum is a numeric expression. The final form of the width statement
changes the width of the printer (see lprint).
Line 20 opens file number one and line 30 changes the current width to 40
characters per line.
20 open "datafile" for output as #1
30 width #1, 40
In the next example, the width of the screen is set to 40 columns per line.
If FileNum is not open, an "Bad file number" error occurs.
If Size is less than 0 or greater than 255, an "Illegal function call"
The Basmark QuickBASIC Programmerís Manual