Input processing codes (also called input conversions), correlatives, and output processing codes (also called output conversions) are special codes used in the file-defining and attribute-defining items to allow data to be stored in one way and retrieved or displayed in another way. They can also be used to convert data as it is entered into a more efficient format for storage, and then unconvert them for display. Processing codes can:
Interact with other attributes to return summary information.
Perform functions on portions of the data.
Specify a range within which the data must fall.
Place constraints on the length of the data to be input or output.
Mask off certain characters, convert others, and scan for specific patterns.
These topics are presented:
Input Conversions, Correlatives, and Output Conversions
See Also
Controlling and Dependent Structures