Update Exercise 4 - Polygon.txt

Part 2/5. Polymorphism, virtual functions, abstract classes/Exercises/Exercise 4 - Polygon.txt

-Realize the calculation of the areas of a rectangle and a triangle by a base class called "polygon". The class contains a virtual function called "area" which returns 0. The two derived classes are to return their areas by using this function.


Rectangle: length*width
Triangle: length* width/2

Create an instance of each class in the main program.
Then each instance is to reference a polygon object (pointer).
Set the length and width by using the respective pointers and 
output their areas.

Additional task: Transform your virtual function into a purely virtual function.
Then change the main function so that it can be compiled.
(The area of polygon is not output)
\ No newline at end of file
+Realize the calculation of the areas of a rectangle and a triangle by a base class called "polygon". The class contains a virtual function called "area" which returns 0. The two derived classes are to return their areas by using this function.
+
+Rectangle: length*width
+Triangle: length* width/2
+
+Create an instance of each class in the main program.
+Then each instance is to reference a polygon object (pointer).
+Set the length and width by using the respective pointers and 
+output their areas.
+
+Additional task: Transform your virtual function into a purely virtual function.
+Then change the main function so that it can be compiled.
+(The area of polygon is not output)