RPG/400
From MidrangeWiki
Note that
- RPG/400 can do just about anything that earlier versions of RPG such as RPG III could do and a whole lot more,
- while RPG 4 can do just about anything that RPG/400 could do and a whole lot more.
New stuff as of RPG/400
This is from the perspective of someone moving from RPG on S/36 SSP to RPG on the 400. Some of these capabilities may have existed with RPG on S/38.
- Test a field for various kinds of validity before processing it
- External File Definition Support. Previously we just had Internal File Definitions.
- Open and Close files
- Key Lists for access to indexed files
- Expansion to the controls on accessing a file where
- Many new structured programming capabilities in conjunction with IFxx
- Refer to indicators using *IN## *ON or *OFF
- Concatenation and Substringing
- Scan a file to locate some character string, and record where it is (byte count sideways)
- CALL a sub-program and be-called, with parameters passed between them
- Output an interactive screen to the users, then read it back in and act on the data provided
