circle

Define, instantiate, and summarize a set of circles. Our Circle class only requires defining the radius of the circle and from that radius we are able to calculate the area and circumference of the corresponding circle.

How to Compile

With a minimal Pony installation, in the same directory as this README file run ponyc. You should see content building the necessary packages, which ends with:

...
Generating
 Reachability
 Selector painting
 Data prototypes
 Data types
 Function prototypes
 Functions
 Descriptors
Optimising
Writing ./circle.o
Linking ./circle

How to Run

Once circle has been compiled, in the same directory as this README file run ./circle. You should see a series of circle definitions printed, which ends with:

$ ./circle
...
Radius: 98
Circumference: 615.752
Area: 30171.9

Radius: 99
Circumference: 622.035
Area: 30790.8

Radius: 100
Circumference: 628.319
Area: 31415.9

Program Modifications

Modify the program to add a get_diameter() method and print the diameter alongside the other measures -- diameter is two times the radius.

$ ./circle
...
Radius: 98
Diameter: 196
Circumference: 615.752
Area: 30171.9

Radius: 99
Diameter: 198
Circumference: 622.035
Area: 30790.8

Radius: 100
Diameter: 200
Circumference: 628.319
Area: 31415.9

For further modification, modify the program so that get_circumference() is calculated using your get_diameter() method.