Aggregation: The aggregation relationship is also known as “has-a” relationship. The aggregation relationship states that objects of one class contain objects of a different class. Consider a quiz, which consists of questions. It can be said that the class “Quiz” aggregates the class “Question” because each quiz has one or more questions. In the UML notation, a line with a diamond-shaped symbol attached to the aggregating class denotes aggregation. Inheritance: Inheritance is also called an “is-a” relationship. Inheritance is the concept of inheriting the members and properties of a base class from the derived class. The main advantages of inheritance are, Code reusability and fast implementation. Reduces the size of the program code. There are five types of inheritance: Single inheritance Multiple inheritance Hierarchical inheritance Multilevel inheritance Hybrid inheritance If a subclass inherits a base class, then the member functions and data members of the super class can be accessed by the derived class. But the derived class does not inherit the constructors from the base classes; each derived class should contain individual constructors. In the UML notation, an arrow line attached to the base class denotes inheritance.

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Chapter 12, Problem 10RE

Program Plan Intro

Aggregation:

The aggregation relationship is also known as “has-a” relationship.

The aggregation relationship states that objects of one class contain objects of a different class.

Consider a quiz, which consists of questions. It can be said that the class “Quiz” aggregates the class “Question” because each quiz has one or more questions.

In the UML notation, a line with a diamond-shaped symbol attached to the aggregating class denotes aggregation.

Inheritance:

Inheritance is also called an “is-a” relationship.

Inheritance is the concept of inheriting the members and properties of a base class from the derived class.

The main advantages of inheritance are,

Code reusability and fast implementation.

Reduces the size of the program code.

There are five types of inheritance:

Single inheritance

Multiple inheritance

Hierarchical inheritance

Multilevel inheritance

Hybrid inheritance

If a subclass inherits a base class, then the member functions and data members of the super class can be accessed by the derived class.

But the derived class does not inherit the constructors from the base classes; each derived class should contain individual constructors.

In the UML notation, an arrow line attached to the base class denotes inheritance.

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