View Compilation Error

0_0_26185413_26629.cpp: In function 'int main()':
0_0_26185413_26629.cpp:17:14: error: 'cin' was not declared in this scope
  while ((c = cin.get()) != '#')
              ^
0_0_26185413_26629.cpp:41:3: error: 'cout' was not declared in this scope
   cout << st.size() << endl;
   ^
0_0_26185413_26629.cpp:41:24: error: 'endl' was not declared in this scope
   cout << st.size() << endl;
                        ^
0_0_26185413_26629.cpp:47:10: error: expected '}' at end of input
  return 0;
          ^