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Of course, you could define a display_short_name function
for railroad_car in which rrc is an acronym for
railroad cars:
class railroad_car {
public: railroad_car ( ) { }
void display_short_name ( ) {cout << "rrc";}
};
Including such a definition gets you past the C++ compiler, but then, you find the result peculiar:
rrc rrc rrc rrc rrc
The reason you get nothing but lines containing rrc is that C++
ordinarily decides which display_short_name function to use
at compile time, and at compile time, all C++ knows is that it
is looking at an array that is supposed to contain
railroad_car objects.