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You have seen, in this chapter, how you can have a default constructor call an argument-bearing constructor. You can also have an argument-bearing constructor call another argument-bearing constructor.
Suppose, for example, that all box cars have the same height and
width—they vary only in length. Write a one-argument
constructor for the box_car class that does all its work
by calling the appropriate box class constructor.
Next, rewrite the default box_car constructor such that it
makes use of the one-argument box_car constructor.