Objectives:
Implement an abstract class
Use pointers and references effectively
Question 1:
Download lab12_Q1.cpp. Triangles, and Circles are Shapes, geometric objects which can have their perimeter and area calculated. Implement a Shape abstract class, which can be used in the following manner:
void describeShape(Shape &s) {
double area = s.getArea();
string type = s.getType();
double perim = s.getPerimeter();
cout << “This “ << type << “ has a perimeter of: “
<< perim << “ and an area of: “ << area << endl;
}
The Shape class is provided for you. Implement Triangle and Circle classes and use the given driver program to produce the following output:
Please do not modify the driver program. No state pertaining to the Triangle or Circle may be stored in the Shape objects. Use Heron’s formula for calculating the area of a Triangle: A = √(s (s - a)(s - b)(s - c)), s = (a + b + c)/2
Question 2:
Download lab12_Q2.cpp. The following function accepts objects by reference and indicates the object that has larger area by storing a value in the variable pointed to by result. Implement the function using the classes defined in Question 1.
/**
Determines the larger area between two Shape objects
The larger area is stored in result
*/
void largerArea(Shape &a, Shape &b, double *result);
Use the given driver program to produce the following output:
Note, largerArea() must not produce terminal output, the value must be passed to the caller through the result pointer variable.
