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Until now to test the number of parameter in a procedure i always use the %parms bif , but in some example i see the use of the procedure ceedod
CEEDOD retrieves the operational descriptor of a parameter. This can tell you the data type of the parameter and the length of the parameter. This is ONLY valid if an operational descriptor was used (OPDESC has to be specified on the prototype)
CEETSTA tests to see whether a parameter was passed with the *OMIT keyword. This is only useful if you have options(*omit) specified on the prototype. In RPG, you can also check this with the %addr() BIF.
%PARMS checks HOW MANY parameters were passed. It's commonly used to check for options(*nopass) parameters.
All 3 of these are very different things that are used for different purposes.
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