can anyone explain this code

Question

#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;
}
how to retify this error!!!

Answer 1

you cant use this=t;
this is a pointer with a set address you cant change
instead you can use x=t->x;