View Compilation Error

0_0_20880269_18544.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_20880269_18544.cpp: In function 'int main()':
0_0_20880269_18544.cpp:20:13: error: 'cin' was not declared in this scope
      while (cin >> n, n){ 
             ^
0_0_20880269_18544.cpp:21:9: error: 'cout' was not declared in this scope
         cout << s[n] << endl; 
         ^
0_0_20880269_18544.cpp:21:25: error: 'endl' was not declared in this scope
         cout << s[n] << endl; 
                         ^