View Compilation Error

0_0_21254310_4724.cpp: In function 'int main()':
0_0_21254310_4724.cpp:7:9: error: 'cin' was not declared in this scope
  while (cin >> a >> b >> n)
         ^
0_0_21254310_4724.cpp:14:3: error: 'cout' was not declared in this scope
   cout << q[(n - 1) % 48] << endl;
   ^
0_0_21254310_4724.cpp:14:30: error: 'endl' was not declared in this scope
   cout << q[(n - 1) % 48] << endl;
                              ^