Exercise on class inheritance in C++. General requirements: • All data members must be declared as “private” • No global variable is allowed to be declared and used (constants are ok) • Methods within the class and the requested functions cannot have “cin” or “cout” but it should make use of parameters and return value instead unless it is stated explicitly. • “cin” and “cout” should be used in main() or any testing functions • Please make sure that you clearly show how the C++ class, its methods and all the functions are being called and print out its return value and its results properly Please answer the following questions. 1. Define a class named “BooleanVariable” that manages a variable name (string) and a boolean value (true or false). It should not have default constructor. The class must at least provide the following methods: - toString() method that can return a string in the following format: variable-name(variable-boolean-value) such as isSuccessful(true) - contains() that accepts a search string and it will return true if its variable name contains that string(case-insensitive) and false otherwise. Show how this class being used to create objects and call all its methods and show how they work.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Exercise on class inheritance in C++.

General requirements:
• All data members must be declared as “private”
• No global variable is allowed to be declared and used (constants are ok)
• Methods within the class and the requested functions cannot have “cin” or “cout” but it should make use of parameters and return value instead unless it is stated explicitly.
• “cin” and “cout” should be used in main() or any testing functions
• Please make sure that you clearly show how the C++ class, its methods and all the functions are being called and print out its return value and its results properly

Please answer the following questions.
1. Define a class named “BooleanVariable” that manages a variable name (string)
and a boolean value (true or false). It should not have default constructor.

The class must at least provide the following methods:
- toString() method that can return a string in the following format:
variable-name(variable-boolean-value) such as isSuccessful(true)
- contains() that accepts a search string and it will return true if its variable name contains that string(case-insensitive) and false otherwise.
Show how this class being used to create objects and call all its methods and show how they work.

2. Write a new class named “IntegerVariable” that must inherit from the “BooleanVariable” class. This class manages a variable name (string) and a value (integer). Please note that this class must make use of inheritance.

The class must at least provide the following methods:
- toString() method that can return a string in the following format:
variable-name(variable-integer-value) such as count(100)
- isGreater() method that accepts another IntegerVariable object and returns true if its own integer value is greater than the integer value of the given object and false otherwise.
Show how this class being used to create objects and call all its methods and show how they work.

3. Write a function named “contains” that accepts a vector of BooleanVariable object pointers and a search string. It will return the list of BooleanVariable objects that have the variable names containing that given search string (case-insensitive). In addition, it will also return the count of all the variable objects that have the exact match (equal to the search string). Please note that the list can contain pointers to BooleanVariable objects as well as any of its derived class objects such as IntegerVariable objects.

4. Write a function named “createNewVariable” that will read in the variable name and a value (either “true” or “false” or an integer) from the user and create a dynamic BooleanVariable or IntegerVariable object (using new) depending the value that the user entered and return its pointer. You can assume the user will enter “true” or “false” or correct integer value. No error handling for the value is required.

Please note that this function can use cin and cout.

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