Commodore 64 - Converting Standard Basic Programs to Commodore 64 Basic; String Dimensions; Multiple Assignments

APPENDIX K
CONVERTING STANDARD
BASIC PROGRAMS TO
COMMODORE 64 BASIC
If. you have programs written in a BASIC other than Commodore
BASIC, some minor adjustments may be necessary before running them
on the Commodore-64. We've included some hints to make the conver-
sion easier.
String Dimensions
Delete all statements that are used to declare the length of strings. A
statement such as DIM A$(I,J), which dimensions a string array for J
elements of length I, should be converted to the Commodore BASIC
statement DIM A$(J).
Some BASICs use a comma or ampersand for string concatenation.
Each of these must be changed to a plus sign, which is the Commodore
BASIC operator for string concatenation.
In Commodore-64 BASIC, the MID$, RIGHT$, and LEFT$functions are
used to take substrings of strings. Forms such as A$(I) to access the Ith
character in A$, or A$(I,J) to take a substring of A$ from position I to J,
must be changed as follows:
Other BASIC
A$(I)
= X$
A$(I,J) = X$
Commodore 64 BASIC
A$ = LEFT$(A$,I-1)+X$+MID$(A$,I+1)
A$ = LEFT$(A$,I-1)+ X$+MID$(A$,J+ 1)
Multiple Assignments
To set Band C equal to zero, some BASICs allow statements of the
form:
19) LET B=C=9)
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