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- import java.util.Scanner;
- class Main {
- public static void main(String[] args) {
- Scanner scan = new Scanner(System.in);
- final double PI = 3.14159;
- System.out.println("Please enter a radius:");
- int radius = scan.nextInt();
- double area1 = PI * radius * radius;
- double area2;
- double circ1 = PI * radius * 2;
- double circ2;
- System.out.println("The area of a circle with radius " + radius + " is " + area1);
- System.out.println("The circumference of a circle with radius " + radius + " is " + circ1);
- radius = radius * 2;
- area2 = PI * radius * radius;
- circ2 = PI * radius * 2;
- System.out.println("The area of a circle with radius " + radius + " is " + area2);
- System.out.println("The cricumference of a circle with radius " + radius + " is " + circ2);
- String areaDoubles=((area2 / area1)==2)?"yes":"no";
- System.out.println("Does area double? " + areaDoubles);
- String circDoubles=((circ2 / circ1)==2)?"yes":"no";
- System.out.println("Does circomference double? " + circDoubles);
- }
- }
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