Explanation of Solution
Three fundamental features of an object-oriented
Data Abstraction:
It encapsulates the data and its associated processes together and also controls access to data.
Inheritance:
It enhances the potential reuse of existing software thereby increasing the software development productivity.
Dynamic Method Binding or Polymorphism: It allows more flexible use of inheritance.
In early times, main focus was on process- So the process oriented design methodologies were used. But with increasing complexity of programs and data, data oriented design methodologies became more prevalent. Data oriented design uses Data Abstraction to solve complex problems. Say for example, you need a stack for a particular problem...

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Chapter 1 Solutions
Concepts Of Programming Languages
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