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EVALuate (<evaluate-statement>)
is a control statement.
<symbol> = <operation>
<vflc> [<op> <operation> ]
denotes addition or concatenation for strings.
denotes subtraction or unary minus or negative concatenation for strings.
denotes multiplication.
denotes division.
denotes exponentiation.
denotes exponentiation (same as ^ ).

<function>|<symbol>|<real>|<integer>|<string> deals with the fact that the data types of the operations and operands have to match; otherwise an error message is issued. The available functions, such as SIN, COS, and TAN, are defined in Section 2.16.

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