View Compilation Error

0_0_37593019_26886.cpp: In function 'int main()':
0_0_37593019_26886.cpp:4:9: error: 'cin' was not declared in this scope
  while (cin >> test[0] >> test[1] >> test[2]) {
         ^
0_0_37593019_26886.cpp:5:22: error: 'sort' was not declared in this scope
   sort(test, test + 3);
                      ^
0_0_37593019_26886.cpp:6:3: error: 'cout' was not declared in this scope
   cout << test[0] << ' ' << test[1] << ' ' << test[2] << endl;
   ^
0_0_37593019_26886.cpp:6:58: error: 'endl' was not declared in this scope
   cout << test[0] << ' ' << test[1] << ' ' << test[2] << endl;
                                                          ^