Create a class called Book to represent a book. A Book should include four pieces of information as private instance variables‐a book name, an ISBN number, an author  name and a publisher. Provide public get methods and set methods  for each instance variable. Inaddition, pr

1. Write a class named Circle with the following properties: a. point (x,y) b. Radius 2. write a constructor which initialize these properties (x,y and radius must be greater than or equal 0) 3. write a method called area which returns the area of the circle(radius * radius) 4. write a method called Print which prints circle information. 5. write an application to test your class?

use c# to Create a class called sales1 that includes two instance variables—a name (type String) and the amount of sales (double). Provide a constructor that initializes the two instance variables. Provide a set and a get method for each instance variable. If the amount of sales is not positive, do not set its value. Write a test app named sales1Test that demonstrates class sales1’s capabilities. Create two sales objects and display each object’s sales_amount. Then give each sales_amount an addition of $400 and display each sales_amount’s balance again.   You will create the following objects 1) Name: man sales: 500 2) Name: man2 sales: 800

Everything is in the attached picture! Thank you so much!