Design and implement a class to represent a geometric circle, and then test your class definition by implementing a main() method that creates Circle instances and displays their circumferences and areas. Your program should produce the following output on the screen:
The diameter of circle1 is 20.0
The area of circle1 is 314.0
The circumference of circle1 is 62.80
The diameter of circle2 is 30.0
The area of circle2 is 706.5
The circumference of circle2 is 94.2