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Polymorphism

Polymorphism. #include &lt; iostream &gt; using namespace std; class Base //base class { public: void show() //normal function { cout &lt;&lt; “Base<br>”; } }; class Derv1 : public Base //derived class 1 { public: void show() { cout &lt;&lt; “Derv1<br>”; } };

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Polymorphism

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  1. Polymorphism

  2. #include <iostream> using namespace std; class Base //base class { public: void show() //normal function { cout << “Base\n”; } }; class Derv1 : public Base //derived class 1 { public: void show() { cout << “Derv1\n”; } }; class Derv2 : public Base //derived class 2 { public: void show() { cout << “Derv2\n”; } }; int main() { Derv1 dv1; //object of derived class 1 Derv2 dv2; //object of derived class 2 Base* ptr; //pointer to base class ptr = &dv1; //put address of dv1 in pointer ptr->show(); //execute show() ptr = &dv2; //put address of dv2 in pointer ptr->show(); //execute show() return 0; }

  3. Output • Base • Base • Base

  4. #include <iostream> using namespace std; class Base //base class { public: Virtual void show() //normal function { cout << “Base\n”; } }; class Derv1 : public Base //derived class 1 { public: void show() { cout << “Derv1\n”; } }; class Derv2 : public Base //derived class 2 { public: void show() { cout << “Derv2\n”; } }; int main() { Derv1 dv1; //object of derived class 1 Derv2 dv2; //object of derived class 2 Base* ptr; //pointer to base class ptr = &dv1; //put address of dv1 in pointer ptr->show(); //execute show() ptr = &dv2; //put address of dv2 in pointer ptr->show(); //execute show() return 0; }

  5. Output • Base • Derv1 • Derv2

  6. #include <iostream> using namespace std; class Base //base class { public: Virtual void show() //normal function { cout << “Base\n”; } }; class Derv1 : public Base //derived class 1 { public: void show() { cout << “Derv1\n”; } }; class Derv2 : public Base //derived class 2 { public: void show() { cout << “Derv2\n”; } }; ´void fun(Base & r) { r.show() } int main() { Derv1 dv1; //object of derived class 1 Derv2 dv2; //object of derived class 2 fun (dv1); fun (dv2); return 0; }

  7. output • Derv1 • Derv2

  8. Virtual destructor class Base { public: ~Base() //non-virtual destructor }; class Derv : public Base { public: ~Derv() { cout << “Derv destroyed\n”; } }; int main() { Base* pBase = new Derv; delete pBase; return 0; }

  9. output • Base destroyed

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