View Compilation Error

0_0_30064078_1064.cpp: In function 'int main()':
0_0_30064078_1064.cpp:19:5: error: 'cin' was not declared in this scope
     cin>>t;
     ^
0_0_30064078_1064.cpp:25:9: error: 'cout' was not declared in this scope
         cout<<"Case #"<<tt<<":"<<endl;
         ^
0_0_30064078_1064.cpp:25:34: error: 'endl' was not declared in this scope
         cout<<"Case #"<<tt<<":"<<endl;
                                  ^