Question

Object being passed to a copy constructor ___________

(a) Must be passed by reference

(b) Must be passed by value

(c) Must be passed with integer type

(d) Must not be mentioned in parameter list

I got this question in my homework.

The question is from Copy Constructor in portion Constructors and Destructors of Object Oriented Programming

Answer 1

Right answer is (a) Must be passed by reference

Explanation: This is mandatory to pass the object by reference. Otherwise, the object will try to create another object to copy its values, in turn a constructor will be called, and this will keep on calling itself. This will cause the compiler to give out of memory error.