On Wednesday, 05/03/2017 at 03:47 GMT, Paul Gilmartin (π) <paulgboul...@aim.com> wrote: > Rexx's CALL instruction provides no way to indicate a null > last argument.
CALL XYZ "fun", , "flags", "" XYZ: ARG p1, p2, p3, p4 will provide a null string (length 0) to to both "p2" and "p4" the routine. You can get away without the trailing "" but only if the next line is empty. (Or...."How to make debug more challenging!") I have pretty much abandoned CALL in CMS in favor of function calls with null return values. The REXX interface to CMS (REXEXT macro) suppresses any null command, so I can get more creative in the way I call functions without resorting to syntax crutches like the ones above. It ensures that there is never ambiguity in the purpose of a trailing comma. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott
