/* * Vehicles. by AZTECCO 1/2018 * * an example of a simple hierarchy, * composition and other OOP features * * Base: Vehicles * Derived: Car , Truck * Composition:Engine,Trailer */ #include using namespace std; class Engine { public : Engine (float _power=100.0):power(_power ) { cout<<"Engine::created."< Vroom!\n"; } bool install() { if(!installed) { installed =true; return true ; } cout<<"Engine:msg:This engine is already installed!"<install()) // the Engine::install() method checks and sets a busy state and return a bool { engine=_engine; cout<<"Vehicle:msg: engine insalled successsfully."<remove(); engine=nullptr; cout<<"Vehicle:msg: engine removed."<start(); } else cout<<"Vehicle:msg: no engine installed!"<data(); cout< BEEP! BEEP!\n"; } protected : string color; }; // - - - - - - - - - - - - - END Car class Truck: public Vehicle { public : Truck (string _plate):Vehicle(_plate) { wheels =6; } ~Truck() { cout<<"~truck."<getPlate(); cout<data(); cout< BOOO BOOOOOOP!!\n"; } void attachTrailer(Trailer* _trailer) { trailer =_trailer; cout<<"Truck:msg: trailer "<getPlate()<<" attacked."<Vehicle |\n"; cout<<"| Trailer->Truck |\n"; cout<<"|_______________________________|\n"; cout< ";Car carobj("085 ZER","Red"); cout<<"$New truck > ";Truck truckobj("T 28803"); cout<<"$ *V1=car"< ";V1->horn(); cout<<"$V2 horn > ";V2->horn(); cout< ";V1->start(); cout<<"$start truck > ";V2->start(); cout< ";Engine E1(89); cout<<"$install engine to V1 > ";V1->installEngine(&E1); cout< ";V1->start(); cout< ";V1->data(); cout< ";V2->installEngine(&E1); cout<<"$start V2 > ";V2->start(); cout<<"$remove engine from V1 > ";V1->removeEngine(); cout<<"$install engine to V2 (the V1 removed) > ";V2->installEngine(&E1); cout<<"$start car > ";V1->start(); cout<<"$start truck > ";V2->start(); cout< ";Trailer trailerobj("0909"); cout<<"$attachtrailer > ";/* V2->attachTrailer(trailerobj); Truck::attachTrailer(..) ! this func is not polimorphic. its only in truck class so we cant call from a base pointer we need a cast we will use the object for simply approach */truckobj.attachTrailer(&trailerobj ); cout< ";V2->data(); cout<

Inheritance example (Vehicles)