C++例子。bmw - creates virtual base classes with virtual functions.

newtst - illustrates the use of new and delete .

shapes - uses virtual functions and object constructors

strmtst - shows the use of C++ streams.-C++ examples. bmw- creates virtual base classes with virtual functions. newtst- illustrates the use of ' new'　and ' delete' . shapes- uses virtual functions and object constructors strmtst- shows the use of C++ streams.