7. Let us assume that the distances to different planets in light-years are stored, line by line, in a file planets.dat. Write down a piece of code that, given this file, produces a new file days.dat in which the same distances are listed in light-days.
8. Define a class Car with three fields make, horsepower, and wheelRadius, constructor method, and methods which return the wheel's circumference and area. Use constant(s) and methods from the Math package.