3.
a. Create a console-based program whose Main() method
holds two integer variables. Assign values to the variables.
Within the class, create two methods, Sum() and
Difference(), that compute the sum of and difference
between the values of the two variables, respectively. Each
method should perform the computation and display
the results. In turn, call each of the two methods from
Main(), passing the values of the two integer variables.
Save the program as Numbers.cs.
b. Add a method named Product() to the Numbers class.
This method should compute the multiplication product of
two integers, but not display the answer. Instead, it should
return the answer to the calling Main() method, which dis-
displays the answer. Save the program as Numbers2.cs.
c. Create a GUI application that contains the methods
described in Exercises 3a and 3b. When the user
clicks a button, display the results. Save the project as
Numbers2GUI.
