Commodore Plus 4 - Page 103

BASIC Version 3.8 Commands, Functions, and System Variables 91
STEP Abbr. stE
Tells the computer how much to add to the counter variable in a FOR. . . TO
. . . NEXT loop. See FOR . . . NEXT.
STOP Abbr.sT
Suspends the execution of the current BASIC program and sends the com
puter to immediate mode so you can debug. Any OPEN files stay OPEN after a
STOP, and variables retain the values they had when the program was
interrupted.
When STOP executes, the computer displays the message BREAK IN LINE
line number, just as if you pressed the STOP key. You can use the CONT
command to restart the program at the line following the STOP command as
long as you follow the CONT restrictions: do not make program changes. You
can also use GOTO to restart the program. Type GOTO and the line number
where you want to resume.
Use END when you do not want the BREAK message.
STR$ Abbr.stR
STR$ (number)
Translates the number in parentheses to a text string. If the number is negative,
a minus sign precedes it in the string. A leading blank space is generated if the
number is positive. A trailing blank space is not generated in either case.
Example: 10 X = 67: Y = -2S.4
SO X$ = STR$(X)
30 Y$ = STR$(Y)
40 PRI1JTX$;Y$
RUN
67-22.4
SYS Abbr.sY
SYS memory location
Executes a machine-language program at the memory location named, which
can be anywhere in RAM or ROM. For more information, see Chapter 5.
You can put a SYS command in a BASIC program to combine the BASIC
program with a machine-language program. If you do this, the machine-language
program is considered a subroutine, and you must end the machine-language
program with an RTS (return from subroutine) instruction. This RTS instruction
sends program control back to the BASIC program line that follows the SYS
command.