Structure Programming

Components

Define Procedure
Define Function
Scope of variables
Return Value
Call Procedure
Call Function
Release Variable

Procedure may be a generated server file (*.prg) or inline procedure.

Procedure does not return a value.

Scope of variables:

Variables may have the following scope:

LOCAL: Visible only within the routine which declared it. Value is lost upon exit of the routine.

STATIC: Visible only within the routine which declared it. Value is preserved for subsequent invocations of the routine. If a STATIC variable is declared before any Procedure/Function/Method is defined, it has a MODULE scope, and is visible within any routine defined within that same source file, it will maintain its life for the duration of the application life time.

PRIVATE: Visible within the routine which declared it, and all routines called by that routine.

PUBLIC: Visible by all routines in the same application.

Due to the dynamic nature of PRIVATE and PUBLIC variables, they can be created and destroyed at Run-time

Example - Screen shots:-