Optional parameters Some of the parameters passed to a procedure can be optional parameters... Parameters of a procedure with a variable number of parameters When the procedure uses a variable number of parameters, you must be able to handle the different parameters passed to the function in the code of the procedure. Parameters of a procedure/function You have the ability to pass parameters to a procedure. Passing parameters The parameters can be passed to a procedure... Typecasting of parameters The description of the parameter type is optional... Useful parameters of a procedure A procedure can declare some parameters that are not immediately used. In this case, a warning appears in the code editor, indicating that the local variable is not used.