C++ onlyQuestion 4 Please answer the following questions.1. Define a class named "BoolVariable" 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:o toString() method that can return a string in the following format:variable-name(variable-boolean-value) such as isSuccessful(true)o containsIgnoreCase() that accepts a search string and it will return true ifits variable name contains that string (case-insensitive) and falseotherwise.Show how this class being used to create objects and call all its methods and showhow they work.2. Define a new exception class named "VarNameException" that must inheritfrom the C++ runtime error class. This class will capture the error case for avariable name when it is empty, only blanks or starting with a number.For example, if the user tries to create with a variable name of ","Iname", it will generate an exception and this class should capture the reasonand the error value.*, or3. Write a new class named "IntVariable" that must inherit from the"BoolVariable" 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:o toString() method that can return a string in the following format:variable-name(variable-integer-value) such as count(100)o isGreater() method that accepts another IntVariable object and returns trueif its own integer value is greater than the integer value of the given objectand false otherwise.Its constructor will generate exception with the right error informationusing the VarNameException class whenever it is given a variable namethat can be empty, all blanks or starting with a number. 4. Write a function named "containsIgnoreCase" that accepts a vector ofBoolVariable object pointers and a search string. It will return the list ofBoolVariable objects that have the variable names containing that given searchstring (case-insensitive). In addition, it will also return the count of all the variableobjects that have the exact match (equal to the search string). Please note that thelist can contain pointers to BoolVariable objects as well as any of its derived classobjects such as IntVariable objects.5. Write a function named “createVariable" that will read in the variable name anda value (either "true" or "false" or an integer) from the user and create a dynamicBoolVariable or IntVariable object (using new) depending the value that the userentered 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.This function must handle all error cases for invalid variable names entered by theuser: empty, all blanks or starting with a number by handling exception usingtry-catch. It will print out proper error message and continue to ask the user forthe new value until it is correct name.Please show how this function is being tested andprint out the correct variable information.

Question

C++ onlyQuestion 4 Please answer the following questions.1. Define a class named &#34;BoolVariable&#34; 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:o toString() method that can return a string in the following format:variable-name(variable-boolean-value) such as isSuccessful(true)o containsIgnoreCase() that accepts a search string and it will return true ifits variable name contains that string (case-insensitive) and falseotherwise.Show how this class being used to create objects and call all its methods and showhow they work.2. Define a new exception class named &#34;VarNameException&#34; that must inheritfrom the C++ runtime error class. This class will capture the error case for avariable name when it is empty, only blanks or starting with a number.For example, if the user tries to create with a variable name of &#34;,&#34;Iname&#34;, it will generate an exception and this class should capture the reasonand the error value.*, or3. Write a new class named &#34;IntVariable&#34; that must inherit from the&#34;BoolVariable&#34; 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:o toString() method that can return a string in the following format:variable-name(variable-integer-value) such as count(100)o isGreater() method that accepts another IntVariable object and returns trueif its own integer value is greater than the integer value of the given objectand false otherwise.Its constructor will generate exception with the right error informationusing the VarNameException class whenever it is given a variable namethat can be empty, all blanks or starting with a number. 4. Write a function named &#34;containsIgnoreCase&#34; that accepts a vector ofBoolVariable object pointers and a search string. It will return the list ofBoolVariable objects that have the variable names containing that given searchstring (case-insensitive). In addition, it will also return the count of all the variableobjects that have the exact match (equal to the search string). Please note that thelist can contain pointers to BoolVariable objects as well as any of its derived classobjects such as IntVariable objects.5. Write a function named “createVariable&#34; that will read in the variable name anda value (either &#34;true&#34; or &#34;false&#34; or an integer) from the user and create a dynamicBoolVariable or IntVariable object (using new) depending the value that the userentered and return its pointer. You can assume the user will enter &#34;true&#34; or &#34;false&#34;or correct integer value. No error handling for the value is required.Please note that this function can use cin and cout.This function must handle all error cases for invalid variable names entered by theuser: empty, all blanks or starting with a number by handling exception usingtry-catch. It will print out proper error message and continue to ask the user forthe new value until it is correct name.Please show how this function is being tested andprint out the correct variable information.

Accepted Answer

Actually, program is a executable software that runs on a computer.