63. A copy constructor must receive its argument by reference instead of by value because:
(A) Otherwise the constructor will only make a copy of a pointer to an object.
(B) The copy of the argument passed by value has function scope.
(C) The pointer needs to know the address of the original data, not a temporary copy of it.
(D) Otherwise infinite recursion occurs.
(E) Otherwise the constructor will never be called.
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統計: A(0), B(0), C(2), D(3), E(0) #3081393
統計: A(0), B(0), C(2), D(3), E(0) #3081393