View Compilation Error

0_0_19685617_27441.cpp: In function 'int main()':
0_0_19685617_27441.cpp:3:12: error: 'cin' was not declared in this scope
     while (cin >> n && n != 0) {
            ^
0_0_19685617_27441.cpp:15:90: error: 'SecondOrderDeterminant' was not declared in this scope
             area += SecondOrderDeterminant(new_abscissa, new_ordinate, abscissa, ordinate);
                                                                                          ^
0_0_19685617_27441.cpp:19:88: error: 'SecondOrderDeterminant' was not declared in this scope
         area += SecondOrderDeterminant(new_abscissa, new_ordinate, abscissa1, ordinate1);
                                                                                        ^
0_0_19685617_27441.cpp:20:34: error: 'printf' was not declared in this scope
         printf("%.1f\n", area / 2);
                                  ^