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 Declares a FUNCTION or SUB procedure and invokes argument data type
 checking.
 
    DECLARE {FUNCTION | SUB} name [([parameterlist])]
 
    ■ name           Name of the procedure
 
    ■ parameterlist  One or more variables that specify parameters passed
                     to the procedure when it is called:
 
      [BYVAL] variable[( )] [AS type] [, [BYVAL] variable[( )] [AS type]]...
 
                     • BYVAL     Indicates the parameter is passed by value
                                 rather than by reference; cannot be used
                                 with a variable of a user-defined type
 
                     • variable  Visual Basic variable name; for array
                                 variables, empty parentheses are required
 
                     • AS type   Data type of the variable: INTEGER, LONG,
                                 SINGLE, DOUBLE, STRING, user-defined type,
                                 or two additional types, FORM and CONTROL
 
 See Also
    ◄CALL Statement (Basic Procedures)►
    ◄DECLARE Statement (Non-Basic Procedures)►
    ◄FUNCTION Statement►
    ◄SUB Statement►