Commodore PET - CHAPTER 4: PET BASIC

The program has already been developed in immediate mode. Now that the
groundwork
is done, making a stored program out of the program that we know
works in immediate mode
is simple. Just type in the statements line by line,
beginning each statement
with an increasingly larger line number. Remember
that vou still need the semicolons,
which are the PRINT format but not the colons
when
putting statements one per line. Terminate each line with a RETURN.
READ'r'.
100 C$="A"
110 ?"::']".;
120 FOR 1=1 TO 840
130 PRHH C$;
140 NEXT
150 PRINT"PHEIoJ!"
Each time a numbered line is entered, PET stores the line in memory. You
will not have to type the display program line in again now that it is a stored pro-
gram. You then use the LIST,
RUN, and SAVE commands to recall and rerun your
program.
Listing a Program
When the display program looks correct list it and look it over again. To list
a program, type the
word LIST on any free line and hit RETURN.
LIST
100 C$="A"
110 ?"::']".;
120 FOR 1=1 TO 840
130 PR1tH C$.;
140 NEXT
150 PR ItH" PHEI~ ! "
READ'r'.
Note that the ?'s vou entered have been expanded to the word PRINT; PET
does this automatically. If vou see any errors, correct them.
Running a Program
When the program looks completely correct execute the program by typing
RUN, followed by a RETURN.
;';:Ut·j
If the program was typed in correctly, vou should see the same display we
have used throughout this chapter, only with the letter A.
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