View Compilation Error

0_0_33494163_15383.cpp: In function 'int main()':
0_0_33494163_15383.cpp:6:8: error: 'cin' was not declared in this scope
  int x;cin>>x;
        ^
0_0_33494163_15383.cpp:18:3: error: 'cout' was not declared in this scope
   cout<<"Case #"<<i+1<<": "<<s<<endl;
   ^
0_0_33494163_15383.cpp:18:33: error: 'endl' was not declared in this scope
   cout<<"Case #"<<i+1<<": "<<s<<endl;
                                 ^