/in/foo.cc: In function 'int main()':
/in/foo.cc:123:5: error: 'TwoDayPackage' was not declared in this scope
     TwoDayPackage pTwoDay(p, flatFee);
     ^~~~~~~~~~~~~
/in/foo.cc:138:40: error: 'pTwoDay' was not declared in this scope
     cout<< fixed << setprecision(3) << pTwoDay.calculateCost() <<endl;
                                        ^~~~~~~