RPG/400

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Revision as of 12:47, 7 June 2005 by Al Mac (talk | contribs) (New stuff as of RPG/400)
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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. Innitially Externally Described Files were programmed using DDS and later SQL.
  • Massive new support for various kinds of Data Structures and Data Areas, which also can be Externally described
  • 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