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6.2.23.5 OUTPUT PROCEDURE Phrase
This phrase specifies the name of a procedure that is to select or modify output records from the merge operation.
procedure-name-1
Specifies the first (or only) section or paragraph in the OUTPUT PROCEDURE.
procedure-name-2
Identifies the last section or paragraph of the OUTPUT PROCEDURE.
The OUTPUT PROCEDURE can consist of any procedure needed to select, modify, or copy the records that are made available one at time by the RETURN statement in merged order from the file referenced by file-name-1. The range includes all statements that are executed as the result of a transfer of control by CALL, EXIT, GO TO, and PERFORM statements in the range of the output procedure. The range also includes all statements in declarative procedures that are executed as a result of the execution of statements in the range of the output procedure. The range of the output procedure must not cause the execution of any MERGE, RELEASE, or SORT statement.
If an output procedure is specified, control passes to it after the file referenced by file-name-1 has been sequenced by the MERGE statement. The compiler inserts a return mechanism at the end of the last statement in the output procedure and when control passes the last statement in the output procedure, the return mechanism provides the termination of the merge and then passes control to the next executable statement after the MERGE statement. Before entering the output procedure, the merge procedure reaches a point at which it can select the next record in merged order when requested. The RETURN statements in the output procedure are the requests for the next record.
Note: The OUTPUT PROCEDURE phrase is similar to a basic PERFORM statement. For example, if you name a procedure in an OUTPUT PROCEDURE, that procedure is executed during the merging operation just as if it were named in a PERFORM statement. As with the PERFORM statement, execution of the procedure is terminated after the last statement completes execution. The last statement in an OUTPUT PROCEDURE can be the EXIT statement (see "EXIT Statement" in topic 6.2.14).

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