Missing else if in RPG

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At least in V4R5, IBM has not implemented the well-known else if conditional for multiple branching.

This is easily overcome by SELECT/WHENxx:

C                   […]
C                   SELECT
C     FSTAT         WHENEQ    12
C                   […]
C     FSTAT         WHENEQ    1021
C                   […]
C     FSTAT         WHENEQ    1218
C                   […]
C                   OTHER
C                   [… default handler …]
C                   ENDSL
C                   […]

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