Attached is a copy of my SELECT/WHEN macro for PL/1 (F).
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You can copy it into your program or use a %INCLUDE statement and the MACRO compiler option.? One word of caution - the SYSLIB file for PL/1 is restricted to a blksize of 400 or less.
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It is not as good as the SELECTs in other PL/1 compilers but it is better than nothing.
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Ed