Answer to Question #180481 in C++ for Shashank Shekhar Singh

Question

. Create a class Number with a pointer as a data data member of integer type. Write user defined copy constructor to the class and implement the deep copy for the Number class objects. So when a new object is created from an old object of the Number class, pointer data member can point different memory block.

Answer 1

#include<iostream>
using namespace std;
  
class Number
{
    int *ptr;
public:
    Number (int i = 0)      { ptr = new int(i); }
    void setValue (int i) { *ptr = i; }
    void print()          { cout << *ptr << endl; }
    Number & operator = (const Number &t);
};
  
Number & Number::operator = (const Number &t)
{
   // Check for self assignment
   if(this != &t)
     *ptr = *(t.ptr);
  
   return *this;
}
  
int main()
{
    Number t1(5);
    Number t2;
    t2 = t1;
    t1.setValue(10);
    t2.print();
    return 0;
}