Copy constructor

#1

I didn’t get why we are using the & operator in copy constructor ? what are the problem we are getting if we don’t use it and why?

#2

What is the difference between

 int func(int x)

and

int func(int &x)

In the first function a copy of x is created for local use in the function, whereas in second function a memory reference of variable x is send to function and the function accesses the memory directly.

Now lets try to make a copy constructor:

myClass(myClass a)

In this function, just like we previously established a copy of object ‘a’ will be passed to the copy constructor, but wait, to make a copy of ‘a’, program needs a copy constructor. Deadlock…??
Lets see a roundabout

myClass(myClass &a)

Here the function will be given a memory reference of ‘a’ which obviously exists in the memory and its members will be accessible for initializing members of the new (copy) object.

#3

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