View Compilation Error

0_0_18182962_13044.cpp: In function 'int main()':
0_0_18182962_13044.cpp:5:9: error: 'cin' was not declared in this scope
         cin >> n;
         ^
0_0_18182962_13044.cpp:8:19: error: 'pi' was not declared in this scope
                 x=pi*(longs*longs+wides*wides);
                   ^
0_0_18182962_13044.cpp:10:17: error: 'cout' was not declared in this scope
                 cout << "Property " << i << ": This property will begin eroding in year "<< years <<"." << endl;
                 ^
0_0_18182962_13044.cpp:10:108: error: 'endl' was not declared in this scope
                 cout << "Property " << i << ": This property will begin eroding in year "<< years <<"." << endl;
                                                                                                            ^
0_0_18182962_13044.cpp:12:9: error: 'cout' was not declared in this scope
         cout << "END OF OUTPUT." << endl;
         ^
0_0_18182962_13044.cpp:12:37: error: 'endl' was not declared in this scope
         cout << "END OF OUTPUT." << endl;
                                     ^