Commodore PET - Programming Character Placement

For our animation program, then, we must include this time delay loop after
printing the next element. Since the programmed time delay loop remains the
same for each
element we cali it as a subroutine. Therefore, after printing the up-
per left corner of the square, cali the time delay loop, subroutine 100.
PROGRAMMING CHARACTER PLACEMENT
The third phase is to print the top line of the square. Instead of programming
PRINT "-,, we will use a FOR. .. NEXT loop:
15 FOR 1=1 TO 5; F'R l tH U -"; ; GOSLIB 1 ';:10 :NEXT l
Statement 15 uses a FOR. .. NEXT loop so that the subroutine time delay can be
called between each printing of "-". To program the PET to sketch the square
slowly, the time delay must
be called after each character is printed. It would be
useless to program:
15 F'F:ItHu---u; : GOSLIB 1';:1';:1 - incorrect
because the whole line would
be printed instantaneously without any time delay.
To complete the top line, type the upper right corner. Again, include the
time delay subroutine calI.
;~0 F'R l tH U ï
U
.; : GOSLIB 100
So far, the program looks like this:
5 F'R1NT":']".;
10 F'R!tH Il ru.; : GOSLIB 100
15 FOR 1=1 TO 5:F'R1NT"-"; : GOSUB 100:NEXT l
20 F'R1NTuï"; : GOSLIB 100
100
FOR 3=1 TO 10:NEXT 3:RETURN
Run the program. You should see the following progression appear on the
screen:
1
~
Hopefully, this is what vou saw. If not go back and find out what went wrong. Did
vou forget the semicolons after each
PRINT statement?
End ail PRINT statements in this program with a semicolon; the semicolon
concatenates graphic strings together when printed. This allows
the" r" and
the top line
"-" to be concatenated together on the same line:
233