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I have just written the morse code program and it seems fine. I just have a little problem. In the query menu, I input 'a' and it works fine, then i input 'b' and it is still fine. But then I do 'a'...

Yeah I want to output the result after testing the ISBN from the input file to the other text file. I know I might use an ofstream but I am not sure how to use it right.

Thanks for the tip. I can open the file now. I have another question: Can I copy the result to another text file? How can I do that?

I write a program that validate ISBN number. Everything works fine but It can not open the file which contain ISBN numbers. Can anyone show me why?

#include <iostream>
#include <fstream> ...