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Structure

Structure is a hierarchically ordered set of values that may be of different data types. The immediate components of a structure are called "members" of the structure. An entire structure can be transmitted in stream or record I/O, passed as an argument, or assigned to another structure of identical size and shape and having members of corresponding identical data types. No conversions or calculations can be performed on entire structures.

Size Alignment
Sum of members + gaps for alignment    Most stringent of members' alignment requirements

In Open-PL/I, structure mapping is as follows:

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