View Compilation Error

0_0_18009132_10171.cpp: In function 'int main()':
0_0_18009132_10171.cpp:11:9: error: 'cin' was not declared in this scope
         cin >> n >> m;
         ^
0_0_18009132_10171.cpp:17:9: error: 'cout' was not declared in this scope
         cout << p << "/" << q << endl;
         ^
0_0_18009132_10171.cpp:17:34: error: 'endl' was not declared in this scope
         cout << p << "/" << q << endl;
                                  ^