I think your question is being lost in the translation, because it does not make sense. "File processing" is a very generic description. What do you want to "process" ? How do you want to "process" it? What is the end result desired?
You started off here asking how to write a virus file (a forbidden topic here), then you asked a very geneirc question about the function of c++, now you are asking a question that does not make a lot sense. If we cannot understand you, we cannot help you.
No offense, but English is the operating language of this forum, and yours is not very good. You need to make your questions a bit more understandable, or no one is going to be able to help you.
look up information on ifstream and ofstream. the msdn library is your friend. if you have errors with code you ALREADY have written, it is better to ask that here than to try and get a programming course out of the forum.
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You started off here asking how to write a virus file (a forbidden topic here), then you asked a very geneirc question about the function of c++, now you are asking a question that does not make a lot sense. If we cannot understand you, we cannot help you.
No offense, but English is the operating language of this forum, and yours is not very good. You need to make your questions a bit more understandable, or no one is going to be able to help you.
Dexter...