Whereas B$ contains mere quote image characters (with code 192), A$ contains genuine string quote
characters (with code 11).
3. Run this program:
10
LET
A$="
LEN
""
ABDC
""
"
100
PRINT
A$;" = ";
VAL
A$
This will fail because
VAL
does not treat the quote image
""
as a string quote.
Insert some extra lines between 10 & 100 to replace the quote images in A$ by string quotes (which you
must call
CHR$
11), & try again.
Make the same modifications to the program in chapter , extercise 3, & experiment with it.
4. This subroutine deletes every occurance of the string "CARTHAGO" from A$.
1000
FOR
N=1
TO LEN
A$-7
1020
IF
A$(N
TO
N+7)="CARTHAGO"
THEN LET
A$(N TO N+7)="********"
1030
NEXT
N
1040
RETURN
Write a program that gives A$ various values (e.g. "DELENDA EST CARTHAGO.") & applies the
subroutine.
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