Inheritance in c++theory
- 1. By Sonali Gholve Base Derived1 Derived2 Parent Child Grand Parent Prent Child
- 2. The method by which we can derive a new class from an old called Inheritance or derivation. Old class- Base class New class- Derived class/ subclass Parent/Old/Base Child/new/derived
- 3. Single Inheritance Multilevel Inheritance Multiple Inheritance Hierarchical Inheritance Hybrid Inheritance Multipath Inheritance
- 4. Reusability- use the function/data in derived class Reliability- Derived class is used or adapt the feature from the base class Save time and memory Enhancement Classification Industry used
- 5. Syntax: class base { class body; members of the class base; }; class derived :visibility_mode base { class body; members of the class derived; }; example: class shapes { char color; void show(); }; class square :public shapes { int side; void area(); };
- 6. If we declare members in private visibility mode, then that used is only within a self class and not other class. If we declare members in protected visibility mode, then that used is only within a self class and derived class not other class. If we declare members in public visibility mode, then that used for all function, which declared in the program.
- 7. Parent Child • Only one base/Parent class and only one derived/child class • If a single class is derived from one base class then it is called single inheritance. • Child has own functionality, which is differ than parent class.
- 8. #include <iostream> using namespace std; class parent //single base class { public: int x; void getdata() { cout << "Enter the value of x = "; cin >> x; } }; class child : public parent //single derived class { private: int y; public: void readdata() { cout << "Enter the value of y = "; cin >> y; } void product() { cout << "Product = " << x * y; } }; int main() { child a; //object of derived class a.getdata(); a.readdata(); a.product(); return 0; }
- 9. If a class(ABC) is derived from another derived class(XYZ) then it is called multilevel inheritance. So in C++ multilevel inheritance, a class has more than one parent class. XYZ class is also known as intermediate base class. Grand Parent XYZ ABC
- 10. #include <iostream> using namespace std; class grandparent //single base class { public: int x; void getdata() { cout << "enter the value of x = "; cin >> x; } }; class parent : public grandparent // derived class { public: int y; void readdata() { cout << "enter the value of y = "; cin >> y; } }; class child : public parent // derived from class parent { private: int z; public: void intdata() { cout << "nenter value of z= "; cin >> z; } void product() { cout << "nproduct= " << x * y * z; } }; int main() { child a; //object of clild class a.getdata(); a.readdata(); a.intdata(); a.product(); return 0; }