View Compilation Error

0_0_34385288_19642.cpp: In function 'int main()':
0_0_34385288_19642.cpp:6:2: error: 'cin' was not declared in this scope
  cin>>t;
  ^
0_0_34385288_19642.cpp:12:3: error: 'cout' was not declared in this scope
   cout<<"Case #"<<i<<": ";
   ^
0_0_34385288_19642.cpp:21:15: error: 'endl' was not declared in this scope
    cout<<sum<<endl; 
               ^
0_0_34385288_19642.cpp:24:18: error: 'endl' was not declared in this scope
       cout<<sum<<endl; 
                  ^