/in/foo.cc: In function 'int main()':
/in/foo.cc:6:8: error: 'cin' was not declared in this scope
  while(cin.getline(s,17))
        ^
/in/foo.cc:11:2: error: 'cout' was not declared in this scope
  cout<<cnt<<endl;
  ^
/in/foo.cc:11:13: error: 'endl' was not declared in this scope
  cout<<cnt<<endl;
             ^