how to use getopt_long() in c language

hi guys i have an hard time understanding how to use getopt_long() in the c language, can you give me a few example and help me with that?

 

This is a rather obscure question. I found this article, maybe it will be helpful.
http://www.informit.com/articles/article.aspx?p=175771&seqNum=3

You might get a better answer if you ask this on a site better dedicated to programming Q&A. For instance, I found this from stackoverflow
https://stackoverflow.com/questions/7489093/getopt-long-proper-way-to-use-it

 

thanks ^^