← Unit 3 · all exercises
Saved in this browser only

A circle

Write a Circle class storing a radius as a double. area returns pi times the radius squared, using Math.PI. diameter returns twice the radius.

class Circle { Circle(double r); double area(); double diameter(); }

Circle.java
Loading editor…
Results

Examples

  • new Circle(1).diameter() → 2
  • new Circle(2).diameter() → 4

There are also 3 hidden tests you can't see. Solve the problem, not the examples.