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?BAD SUBSCRIPT ERROR
Category
Reference/Basic Error Messages

Topic
This error occurs if a reference is made to an array element outside the boundaries of the array.

Examples
PRINT A(-1) negative indexes are not allowed.
PRINT A(11) will cause this error. Remember that arrays that are not explicitly declared with DIM statement have elements from 0-10.
10 DIM A$ (20):A$ (21) = "OOPS!" will cause this error, since 21 is outside the array boundary.

ERR$ error number
18



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