Copy Constructor

Defination:-Copy Constructor creating a new object from existing object of same .When we do not define a copy constructor .compile provide a default copy constructor.when there is a object owns a pointer variable and a reference non shareable.Use of const Keyword becose The const is there to ensure that you don't modify the other object.
Signature of copy Constructor
MyClass
{
Public:
  MyClass()
{
}
MyClass(const MyClass&)
{
}
};
or another ex

X(const X& copy_from_me);
X(X& copy_from_me);
X(const volatile X& copy_from_me);
X(volatile X& copy_from_me);
X(const X& copy_from_me, int = 10);
X(const X& copy_from_me, double = 1.0, int = 40);