title: Finding a substring within a string
body: <p>In C++ I have a phonebook with many names, such as Sinatra, Frank, and I want the user to be able to input any length of string to scan the file for it. Once I have the user input a string of any desired length, how do I scan an entire string of "Sinatra, Frank" for just "Frank" or "Sinatra" or "atra" and see which name(s) it belongs to?</p>