Procedures

A procedure is a block of ViviFire statements between a declaration clause (Function, Method, Property, Sub) and an end clause (End). Almost all control statements must be in a procedure. A module (Program) can contain control statements also. But we recommend a procedure for a program that is larger than a small example.

Calling a procedure

You run a procedure from a different area of the code. This is known as a procedure call. When the procedure completes, it moves control back to the code that executed it, also known as the caller. The caller is a statement (or an expression in a statement) that refers to the procedure by its name and moves control to it.

Returning from a procedure

A procedure gives back control to the caller when it is done. It can use one of the statements Return or Exit, or let it run until the clause End. Then control moves to the caller after the point of the procedure call.

• With Return, control immediately goes back to the caller. Statements after Return do not run. You can have more than one Return in the same procedure.
• With Exit, control immediately goes back to the caller. Statements after Exit do not run. You can have more than one Exit in the same procedure. Also, you can mix Return and Exit in the same procedure.
• If a procedure does not have one of the statements Return or Exit, it stops at the line End. End follows the last statement of the procedure body. End immediately causes control to go back to the caller. You can have only one clause End in a procedure.

Parameters and arguments

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Types of procedures

• Sub procedures
• Event-handling procedures
• Function procedures
• Method Procedures
• Property Procedures
• Generic procedures

Procedures and structured code

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See also

• Function Procedures
• Method Procedures
• Property Procedures
• Sub Procedures
• Procedure Parameters and Arguments
• Recursive Procedures
• Procedure Overloading
• Generic Procedures
• Program Entry Point