There is a Byte array of A, if we know that the array can only be a maximum ceiling of 4, you use Dim Dim A As Byte (4) However, if we do not pre-determine its size, or need to change it at runtime must use the size of the dynamic array Dim A As Byte () ReDim A (4) ' This will change the size of the original data in clear ReDim Preserve A (4)' This change will retain the original size of the data

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