A function defines a list of processes that will operate on the files and fields in your database.CA 2E provides a variety of standard functions based on your data model to which you can add your own unique processing.
A function can be implemented either as a separate program or as a subroutine within a program. An external function is implemented as a separate HLL program. Each external function is attached to an access path. In general, the standard device functions are external functions. An internal function is implemented as a subroutine of the program that calls it.
You can link functions together to create larger processes that become the building blocks of your applications.
In addition to the standard functions,CA 2E provides message functions, function fields, and built-in functions, that perform low-level processing such as arithmetic operations
This is the third task of the defining phase for development.
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