Answer / krocks

Ans 1 : We declare all our variables in D spec. Generally D spec comes after F spec on top of RPG program, but you can declare anywhere in your program.

Ans 2 : I-Spec and O-Spec are concept from RPG III, where one need to declare different variables for input and output. In D -Spec in RPG IV you need to declare only 1 variable for input and output.
I,O Spec used for RPG life cycle, printer file output etc...

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