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You're obviously not telling us everything:
The variables file_name and op haven't been declared.
You haven't shown us what headers are being included.
The diagnostic message you say you're...

Did you try ?


getopt(argc, argv, "ABCD:")

What OS are you using?

Exactly what is the command line that this code is parsing?

Is there any code in your script that modifies argc, argv, or any of the strings pointed to by argv[0] through...

You need a colon following the D in your optstring, if it is supposed to take an value (i.e. -D7 ) and not just be a flag (eg -D):

getopt(argc, argv, "A:B:C:D:")

btw break ends the case...