阅读以下说明和C++程序,将应填入(n)处的字句写在对应栏内。[说明]下面程序是为汽车市场编制的一个程序的一部分。其中automobile是基类。[C++程序]//Auto.hifndef AUTO_Hdefine AUTO_Hclass automobile{(1):int miles_per_gallon; //汽车每加仑行驶公里数float fuel_capacity; //油箱容积public:void initialize(int in_mpg,int in_fuel);int get_mpg(void);float get_fuel(void);float travel_distance(void);}endif//Auto.cppinclude'auto.h'void automobile::initialize(int in_mpg,float in fuel){miles_per_gallon=in_mpg;fuel_capacity=in_fuel;)int automobile::get_mpg() //提供一辆特定汽车每加仑公里数{return miles per_gallon;}float automobile::get_fuel() //提供油箱容积{return fuel_capacity;}float automobile::travel_distance(){return (2) }//car.hifndef CAR_Hdefine CAR_Hinclude'auto.h'class car: (3){int Total_doors;public:void initialize(int in_mpg,float in_fuel,int doors=4);int doors(void);};endif//car.cppinclude'car.h'void car::initialize(int in_mpg,float in_fuel,int door){Total_doors=door;miles_per_galion=in_mpg;fuel_capacity=in_fuel;}int car::doors(void){return Total doors;}//Allauto.cppincludeinclude'auto.h'include'car.h'int main(){car sedan;sedan.initialize(24,20.0,4);tout<<'The sedan can travel'<< (4) <<'miles./n';cout<<'The sedan has'<< (5) <<'doors./n';return 0;}
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