Commodore Plus 4 - Page 36

84 The BASIC Language
them OPEN leads to errors. Note that you can have only 10 files OPENed at a
time.
Parameter: logical file number
The logical file number must be the same number you used to OPEN the file.
The logical file number has no relation to the file itself; you can use any number
between 1 and 255 as long as you use the same number in commands, such as
OPEN and CLOSE, that refer to the file.
Example: 10 OPEN 4,4,7 Opens access to the printer.
20 nTPUTX$,Y$
30 PRI1TT #4, X$, Y$ Prints the values input for X$ and Y$.
40 CLOSE 4 Closes access to the printer.
CLR Abbr. cL
Clears the values of all variables without otherwise affecting the current
program. All numeric variables are reset to zero, and all text-string variables are
reset to a null string.
The CLR command is automatically executed when you issue a NEW or RUN
command. CLR is also executed when you edit a program, which is why you
cannot use CONT to resume program execution after you edit the program.
CMD Abbr. cM
CMD file number, output list
Interrupts the normal flow of output to the screen and sends the output to a
different device, such as the printer or a data file. The device or file must first be
accessed by an OPEN command.
Parameters: logical file number, list of output items
1. The logical file number must be the same number you used in the OPEN
command to access the file.
2. The list of output items is optional. It can include numeric and string expres
sions separated with commas or semicolons, just as a PRINT command.
Examples: 10 OPEN 4,4 Opens access to the printer.
20 CMD 4,"THIS IS MY PROGRAM" Directs output to printer and
prints a heading.
30 LIST Lists program to printer under
heading.