ILE RPG Programmer's Guide
RPG code is written on a variety of specification forms, each with
a specific set of functions. Many of the entries which make up a specification
type are position-dependent. Each entry must start in a specific
position depending on the type of entry and the type of specification.
There are seven types of RPG IV specifications. Each specification
type is optional. Specifications must be entered into your source
program in the order shown below.
Main source section:
- Control specifications provide the compiler
with information about generating and running programs, such as the
program name, date format, and use of alternate collating sequence
or file translation.
- File description specifications describe
all the files that your program uses.
- Definition specifications describe the data
used by the program.
- Input specifications describe the input
records and fields used by the program.
- Calculation specifications describe the
calculations done on the data and the order of the calculations. Calculation
specifications also control certain input and output operations.
- Output specifications describe the output
records and fields used by the program.
Subprocedure section:
- Procedure specifications mark the beginning
and end of the subprocedure, indicate the subprocedure name, and whether
it is exported.
- Definition specifications describe the local
data used by the subprocedure.
- Calculation specifications describe the
calculations done on both the global and local data and the order
of the calculations.
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