What is an array in AS400? Why we use it. Please explain the different types of arrays in RPG programming with examples.
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An array is a collection of elements with the same data type and length.
We commonly utilize the keyword to define an array in an RPG program.
An individual array element can be referred to by its location, while an array name refers to all its members in an RPG application.
The array name must be unique within the RPG program, and the array index must be numeric with zero decimal places.
If the RPG program attempted to use the array index
ARR(Index)
as zero, negative, or more than the number of elements defined in theDIM
keyword, an error occurred during runtime. There are three types of arrays in RPG.Run Time array: It is loaded by the RPG program while running.
Compile Time array: It is loaded when an RPG program is compiled. Any data available in the compile-time array will not be modified unless the RPG programmer changes it and recreates the program object.
Prerun Time array: It is loaded from the Array file when the program begins.