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Given that *cptr's value is a cylinder object, you can embed
*cptr in larger expressions, involving the class-member operator,
that retrieve member-variable values. The following, for example,
retrieves the radius of a cylinder:
(*cptr).radius
Note that you must enclose *cptr in parentheses to refer the radius
of the cylinder object to which cptr points, because the
class-member operator, the period, has precedence higher than that of the
dereferencing operator, the asterisk. Accordingly, a version without
parentheses, *cptr.radius, is equivalent to *(cptr.radius),
which means produce the object pointed to by a pointer stored,
peculiarly, in the radius member variable of a pointer to a cylinder
object. What you want, of course, is the version that means produce
the value stored in the radius member variable of the dereferenced pointer
to a cylinder object.