http://answers.yahoo.com/question/index?qid=20110507033952AAXZBz2 is a short explanation.
tellg(void) and tellp(void) both return their pointer’s position
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ostream& endl (ostream& os);
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stream::rdbuf() changes the filebuf... http://www.cplusplus.com/reference/ios/ios/rdbuf/
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endl – flush() implicitly
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If your variable to "populate" is an int, then extraction operator stops when hitting ...."any character that couldn't be part of an int" which is not limited to white space.
