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What is the difference in passing values ByRef or ByVal to a procedure?

April 26, 2017byref passing procedure values

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What is the difference in passing values ByRef or ByVal to a procedure?

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ByRef -pass the address (for string -address of address of first byte) BY REF IS VERY USEFULL When the contents itself are being modified, when there is large data. Multiple arguments are needed to be returned, instead they can be passed as reference.