How to signify no more input for string ss in the loop while (cin >> ss)

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Your code is correct. If you were interactively inputting, you would need to send a EOF character, such as CTRL-D.

This EOF character isn’t needed when you are reading in a file. This is because once you hit the end of your input stream, there is nothing left to “cin”(because the stream is now closed), thus the while loop exits.

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