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  1.  #include<iostream>
  2. using namespace std;
  3. class Test
  4. {
  5. private:
  6.   int x;
  7. public:
  8.   Test(int x = 0) { this->x = x; }
  9.   void change(Test *t) { this = t; }
  10.   void print() { cout << "x = " << x << endl; }
  11. };
  12. int main()
  13. {
  14.   Test obj(5);
  15.   Test *ptr = new Test (10);
  16.   obj.change(ptr);
  17.   obj.print();
  18.   return 0;
  19. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In member function ‘void Test::change(Test*)’:
prog.cpp:9:33: error: lvalue required as left operand of assignment
   void change(Test *t) { this = t; }
                                 ^
stdout
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Standard output is empty
https://ideone.com/hHzA6e
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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