Circle Area
import java.util.Scanner; import java.util.InputMismatchException; public class circle_area { public static void main(String [] args) { //double pi; Scanner sc = new Scanner(System.in); System.out.println("insert radius"); double radius = sc.nextDouble(); //double pi = 3.14159; System.out.println("circle area = " + Math.PI * radius * radius); } }