Working with Arrays in Commodore BASIC

Arrays let you store multiple values under one variable name. Essential for games and data processing!

Declaring Arrays with DIM

10 DIM A(10)        : REM NUMERIC ARRAY, 11 ELEMENTS (0-10)
20 DIM N$(25)       : REM STRING ARRAY, 26 ELEMENTS
30 DIM GRID(10,10)  : REM TWO-DIMENSIONAL ARRAY

Filling an Array

10 DIM SCORES(5)
20 FOR I = 0 TO 5
30 READ SCORES(I)
40 NEXT I
50 DATA 1000, 2500, 3200, 4100, 5000, 6500

Searching an Array

100 INPUT "SEARCH FOR"; S
110 FOR I = 0 TO 10
120 IF A(I) = S THEN PRINT "FOUND AT POSITION"; I: GOTO 150
130 NEXT I
140 PRINT "NOT FOUND"
150 END

Memory Considerations

• Arrays use memory! A DIM A(1000) uses significant RAM
• String arrays use even more memory
• Place DIM statements at the start of your program

Tip: Use arrays for high score tables, inventory systems, map data, and any collection of related values.