View Compilation Error

0_0_29830518_15181.cpp: In function 'int main()':
0_0_29830518_15181.cpp:3:5: error: 'cin' was not declared in this scope
     cin >> t;
     ^
0_0_29830518_15181.cpp:31:9: error: 'cout' was not declared in this scope
         cout << "Case " << index << ":" << endl;
         ^
0_0_29830518_15181.cpp:31:44: error: 'endl' was not declared in this scope
         cout << "Case " << index << ":" << endl;
                                            ^