why wont it run

import java.util.Scanner;

public class Circle
{
public static void main(String[] args)
{
//declarations
Scanner scan = new Scanner(System.in);
final double PI = Math.PI;
double area, area2, circ, circ2;
double divideArea,divideCirc;
//inputs

``````  //calc

divideArea=area2/area;
divideCirc=circ2/circ;

//outputs
System.out.println("The area of a circle with radius " + radius + " is " +area);
System.out.println("the circumference with radius is " + radius + " is " +circ);
System.out.println("The area of a circle with radius " + radius2 + " is " +area2);
System.out.println("the circumference with radius is " + radius2 + " is " +circ2);