Parameter Semantics
Parameters are categorized in several ways:
Every parameter is classified as value, variable, constant, or out. Value parameters are the default; the reserved
words var, const, and out indicate variable, constant, and out parameters, respectively.
Value parameters are always typed, while constant, variable, and out parameters can be either typed or untyped.
Special rules apply to array parameters.
Files and instances of structured types that contain files can be passed only as variable (var) parameters.
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