Write a Rectangle class that has the following fields: Length (L): a double Width (W): a double The class should have the following functions: Constructor: accepts the length (L) and the width (W) of a rectangle as arguments. Constructor: does not take any parameters and initializes the length(L) and width(W) to zero. A function called getArea which returns the area of the rectangle. A function called getPerimeter which returns the perimeter of the rectangle. {note: The area of a rectangle =L*W, and its perimeter = 2*(L+W) } Then, write a program to ask the user to enter the length and width of a rectangle, and then use the above class to calculate and print the area and perimeter of the rectangle.
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- write a class Point with parametrized constructor. This class have four member variables, a,b,c,d. Write the following member functions a. drawTriangle(int x, int y, int z ) b. drawRectangle(int x, int y, int z, int a). Each function should display the length of lines for each of the shape (triangle, rectangle). For example triangle should calculate length of its three lines by following methods as shown in code. Note: the number of lines depends on the name of shape. void drawTriangle(int x, int y, int z ) { int line 1 = x - y; // convert to positive value if line length is negative int line 2 = y -z; int line 3 = z -x; cout<< The length of each lines is: << //// here display length of each line with proper formatting. } Write similar code for drawRectangle(int x, int y, int z, int a). Wtite main function to call these three functionWrite a convertToMetric class that has the following field: standard - holds a double, standard length value in feet. The class should have the following methods: Constructor - that accepts a length in feet (as a double) and stores it in the standard field. setStandard - accepts a standard length in feet and stores it in standard. getStandard - returns the value of the standard field, as a length in feet, no conversion required. getMeters - returns the value of the standard field converted to meters. getCentimeters - returns the value of the standard field converted to centimeters A second class will be created and used to test the new object class. This, executable class, is to instantiate an object of 'convertToMetric' type. Then it will allow the user to use keyboard input to input a value for standard. That value will then be converted to meters and centimeters, and displayed. Make sure that your output (or display) is user-friendly or easy to read and understand. You should…Build a class named car. This class is defined as follows: It has the fields: Car ID, Car model , Car make, Car color, Car year. Build a constructor that accepts the five parameters (Car ID, Car model , Car make,Car color, Car year). Override the method toString() to return the string representation of Car ID, Carmodel , Car make, Car color, Car year.
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- Make a class called Employee with attributes for name, hours worked, and pay rate. Make a constructor that takes name, hours worked and pay rate as initializing parameters. Make a function in the class that will calculate their gross pay (multiply number of hours worked by pay rate). Make a function in the class called __str__ that prints out the name, hours worked and pay rate. Output a greeting to the user and then Prompt user to enter name, number of hours worked and pay rate. Make an instance of the employee class with the data they input. Now call the grosspay function to get the grosspay and print that out, Next call the __str__ function to print out the data in the instance (name, number of hours worked and pay rate)In this exercise, you have to calculate the student's total marks using the concept of Classes Problem Statement# Write a Java class called Student with ● private fields: ○ name(String type) ○ mark1 and mark2 (double type) And methods: ● getMarks(int markNumber), a method which should return mark1 if markNumber equals 1 and mark2 otherwise. ● calcTotal() method should take the two marks entered and return their sum. Also define two constructors: ● A default constructor that takes no parameters and initializes the values to zeros and null. ● A constructor that takes the three variables and sets them as the values of the appropriate fields. Input# Name of the student and the marks obtained in the first and second tests Output# Sum of both marks Sample Input# Student student = new Student("Jack", 60, 70); Sample Output# getMarks(1) => 60 getMarks(2) => 70 calcTotal() => 130.0 Part of solution class Student { // Define private fields here public Student() { // Write…Write a full class definition for a class named Counter , and containing the following members: A data member counter of type int . A constructor that takes one int argument and assigns its value to counter . A function called increment that accepts no parameters and returns no value. increment adds one to the counter data member. A function called decrement that accepts no parameters and returns no value. decrement subtracts one to the counter data member. A function called getValue that accepts no parameters. It returns the value of the instance variable counter .
- How many default constructors can a class have? a. A class cannot have a default constructor. b. only one c. as many as it needs d. one or more, but fewer than threeIn this lab, you will construct a class called QuadraticSolver that will compute the real roots of a quadratic function (�(�) = ��! + �� + �).The class will implement the following methods.• A default constructor that initializes a legitimate quadratic function.• An overloaded constructor that takes the values of a, b, and c in the function �(�) = ��! +�� + �. This method throws a QuadraticException in the case where the input does not define a quadratic function.• A method that computes the discriminant (�! − 4��).• Boolean methods determining whether the solutions of the quadratic equation ��! + �� + � =0 have real or non-real solutions.• Two methods, one for each real root of the equation ��! + �� + � = 0. Each method will throw a NonRealException when the root is a non-real value.• A toString method that (reasonably) prints the quadratic function.The classes QuadraticException and NonRealException have been provided. Implement a main method in a separate class to test your…Implement the following class MyPhoneBook. You can add additional private member variables and functions.The class has the following private member variables:1- names and phones: Dynamic arrays of strings.2- phoneBookSize: An int that holds size of phonebook.The Class has the following public member functions:1- Parametrized Constructor that takes the size of PhoneBook and allocate dynamic arrays of names and phones and a copy constructor to initialize a PhoneBook using another PhoneBook.2- A function addEntry that adds a name and phone number at the first empty space at corresponding arrays, and returns true if entry is added, false otherwise. An entry is added if there’s space in the array and if phone number if valid. It checks for the validity of the phone number by ensuring that it has 11 digits, and doesn’t include any alphabets or special characters.3- A function displayEntryAtIndex(int) that displays a name and phone number at the specified index. It returns true if the index…