View Compilation Error

0_0_32042947_11210.cpp: In function 'int main()':
0_0_32042947_11210.cpp:14:9: error: 'cin' was not declared in this scope
  while (cin >> y && y != 0)
         ^
0_0_32042947_11210.cpp:26:3: error: 'cout' was not declared in this scope
   cout << sum << endl;
   ^
0_0_32042947_11210.cpp:26:18: error: 'endl' was not declared in this scope
   cout << sum << endl;
                  ^