View Compilation Error

0_0_39881736_10977.cpp: In function 'int main()':
0_0_39881736_10977.cpp:6:16: error: 'cin' was not declared in this scope
    6 |         while (cin >> n && n){
      |                ^~~
0_0_39881736_10977.cpp:16:25: error: 'cout' was not declared in this scope
   16 |                         cout << third << endl;
      |                         ^~~~
0_0_39881736_10977.cpp:16:42: error: 'endl' was not declared in this scope
   16 |                         cout << third << endl;
      |                                          ^~~~