Array Variables

Arrays in Retro Rocket BASIC are collections of variables of the same type, indexed by a zero-based subscript in brackets.

• String arrays end with $ (e.g. names$(0)),
• Real arrays end with # (e.g. values#(10)),
• Integer arrays have no suffix (e.g. scores(5)).

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Declaring arrays

Arrays must be created with the DIM statement:

DIM names$, 100
DIM values#, 50
DIM scores, 200

This allocates arrays with the specified number of elements.

Arrays can be resized dynamically with REDIM:

REDIM names$, 200

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Accessing elements

Use a zero-based index to read or write individual elements:

names$(0) = "Alice"
scores(5) = 42
values#(10) = 3.14

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Assigning to all elements

Assigning to the array name without a subscript initialises all elements:

scores = 0
names$ = "foo"

This sets every element of scores to 0 and every element of names$ to "foo".

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Notes

• Arrays are always contiguous in memory.
• Indexes must be within bounds (0 to length–1) or an error occurs.
• Resizing with REDIM preserves existing values where possible.

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See also: DIM · REDIM · PUSH · POP