C ++ objects input and output streams

C ++ objects input and output streams:

1. The input and output stream class object class type -----

　　Integer variable name

　 　int      age;

　　Nature (and variable data) string object name of the object

　　string name;

　　ostream cout; // operator is a special function

　　cout<<12<<endl;

　　cout.operator<<(12).operator<<endl;

　 endl and "\ n" difference:

     endl and flush the cache can wrap