View Compilation Error

0_0_39728542_23358.cpp: In function 'int main()':
0_0_39728542_23358.cpp:8:17: error: 'cin' was not declared in this scope
    8 |                 cin >> n;
      |                 ^~~
0_0_39728542_23358.cpp:15:17: error: 'cout' was not declared in this scope
   15 |                 cout << sum << endl;
      |                 ^~~~
0_0_39728542_23358.cpp:15:32: error: 'endl' was not declared in this scope
   15 |                 cout << sum << endl;
      |                                ^~~~