C++ | this pointer | Question 3

Predict the output of following C++ program.

#include<iostream>
using namespace std;

class Test
{
private:
  int x;
public:
  Test(int x = 0) { this->x = x; }
  void change(Test *t) { this = t; }
  void print() { cout << "x = " << x << endl; }
};

int main()
{
  Test obj(5);
  Test *ptr = new Test (10);
  obj.change(ptr);
  obj.print();
  return 0;
}

(A) x = 5
(B) x = 10
(C) Compiler Error
(D) Runtime Error

Answer: (C)
Explanation: this is a const pointer, so there is an error in line “this = t;”
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