Hello
I don’t know “gnu-cobol” so I can’t help you technically, but your solution is not necessarily technical, for example:
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you could reserve the first character of the first parameter to contain this number of parameters to apply
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if you can, it’s preferable to externalise the parameters (so they could be modified without modifying any code) in a file of a table and the first line could contain the number or parameters to apply
anyway, it’s better to have the number of parameters to apply somewhere to check if the good number of parameters has been provided correctly