what is question mark(?) ?

what is question mark(?) ?

I know that ifc uses special characters for certain errors: For instance if a real number does not suit the certain format statement, it prints asterixes(*) or in cases os 1/0 division it prints dashes(-), is there anyone who knows in which kind of errors ifc prints question marks(?) ?
If you can help me, I would be very glad.

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See my answer to your question here.


Retired 12/31/2016

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