View Compilation Error

0_0_34023124_4570.cpp: In function 'int main()':
0_0_34023124_4570.cpp:22:12: error: 'cin' was not declared in this scope
     while (cin >> t)
            ^
0_0_34023124_4570.cpp:50:21: error: 'cout' was not declared in this scope
                     cout << i << endl;
                     ^
0_0_34023124_4570.cpp:50:34: error: 'endl' was not declared in this scope
                     cout << i << endl;
                                  ^