Chapter 10 Defining Classes. Chapter 10 Defining Classes.

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Presentation transcript:

Chapter 10 Defining Classes

Overview 10.1 Structures 10.2 Classes 10.3 Abstract Data Types 10.4 Introduction to Inheritance

Introduction to Inheritance 10.4 Introduction to Inheritance

Inheritance Inheritance refers to derived classes Derived classes are obtained from another class by adding features A derived class inherits the member functions and variables from its parent class without having to re-write them Example In Chapter 6 we saw that the class of input-file streams is derived from the class of all input streams by adding member functions such as open and close cin belongs to the class of all input streams, but not the class of input-file streams

Inheritance Example Natural hierarchy of bank accounts Most general: A Bank Account stores a balance A Checking Account “IS A” Bank Account that allows customers to write checks A Savings Account “IS A” Bank Account without checks but higher interest Accounts are more specific as we go down the hierarchy Each box can be a class

Inheritance Relationships The more specific class is a derived or child class The more general class is the base, super, or parent class If class B is derived from class A Class B is a derived class of class A Class B is a child of class A Class A is the parent of class B Class B inherits the member functions and variables of class A

Defining Derived Classes Give the class name as normal, but add a colon and then the name of the base class Objects of type SavingsAccount can access member functions defined in SavingsAccount or BankAccount class SavingsAccount : public BankAccount { … } Display 10.9 (1-3)

Section 10.4 Conclusion Can you Define object? Define class? Describe the relationship between parent and child classes? Describe the benefit of inheritance?

Chapter 10 -- End

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