Commodore Plus 4 - Page 148

EXAMPLE:
GET#1,A$
GOSUB GOSUB//ne#
GOTO
or GO TO
This statement is like the GOTO statement, except that the Plus/4 re
members where it came from. When a line with a RETURN statement is
encountered, the program jumps back lo the statement immediately
following the GOSUB. The target of a GOSUB statement is called a
subroutine. A subroutine is useful if there is a routine in your program
that can be used by several different portions of the program. Instead
of duplicating the section of program over and over, you can sei it up
as a subroutine, and GOSUB to it from the different parts of the pro
gram. See also the RETURN statement.
EXAMPLE;
20 GOSUB 800 means go to the
subroutine begin
ning at line 800
and execute it.
800 PRINT "HI THERE":RETURN
GOTO line #
After a GOTO statement is executed, the next line to be executed will
be the one with the line number following the word GOTO. When used
in direct mode, GOTO line # allows you to start execution of the pro
gram at the given !ine number without clearing the variables.
EXAMPLE:
10 PRINT-COMMODORE"
20 GOTO 10 -*—
The GOTO in line 20
makes line 10 repeat
continuously until you
press RUN/STOP
GRAPHIC GRAPHIC <mode [.clear option} I CLR>
This statement puts the Plus/4 in one of its 5 graphic modes:
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