In file included from /in/DoubleDeckerBus.cpp:1:0:
/in/compile/DoubleDeckerBus.h: In constructor 'DoubleDeckerBus::DoubleDeckerBus(int, int)':
/in/compile/DoubleDeckerBus.h:35:9: error: 'DoubleDeckerBus::passengerNumMax2' will be initialized after [-Werror=reorder]
     int passengerNumMax2;
         ^~~~~~~~~~~~~~~~
/in/compile/DoubleDeckerBus.h:32:9: error:   'int DoubleDeckerBus::passengerNum2' [-Werror=reorder]
     int passengerNum2;
         ^~~~~~~~~~~~~
/in/DoubleDeckerBus.cpp:4:1: error:   when initialized here [-Werror=reorder]
 DoubleDeckerBus::DoubleDeckerBus(int passengerNumMax, int passengerNumMax2) 
 ^~~~~~~~~~~~~~~
/in/DoubleDeckerBus.cpp: At global scope:
/in/DoubleDeckerBus.cpp:7:6: error: prototype for 'void DoubleDeckerBus::print() const' does not match any in class 'DoubleDeckerBus'
 void DoubleDeckerBus::print() const {
      ^~~~~~~~~~~~~~~
In file included from /in/DoubleDeckerBus.cpp:1:0:
/in/compile/DoubleDeckerBus.h:19:10: error: candidate is: virtual void DoubleDeckerBus::print()
     void print();
          ^~~~~
/in/DoubleDeckerBus.cpp:12:5: error: prototype for 'int DoubleDeckerBus::getPassengerNum2() const' does not match any in class 'DoubleDeckerBus'
 int DoubleDeckerBus::getPassengerNum2() const {
     ^~~~~~~~~~~~~~~
In file included from /in/DoubleDeckerBus.cpp:1:0:
/in/compile/DoubleDeckerBus.h:21:9: error: candidate is: int DoubleDeckerBus::getPassengerNum2()
     int getPassengerNum2() { return passengerNum2; }
         ^~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors