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854天前import java.util.Scanner; |
public class Main{ |
public static void main(String[] args) { |
Scanner scan = new Scanner(System.in); |
double r_c1 = scan.nextDouble(); |
double r_c2 = scan.nextDouble(); |
scan.close(); |
Circle c1 = new Circle(); |
c1.setR(r_c1); |
System.out.println(c1.getArea()); |
System.out.println(c1.getPerimeter()); |
Circle c2 = new Circle(r_c2); |
System.out.println(c2.getArea()); |
System.out.println(c2.getPerimeter()); |
|
} |
} |
class Circle { |
private double r; |
public Circle() { |
r = 0; |
} |
public Circle(double _r) { |
r = _r; |
} |
public void setR(double _r) { |
r = _r; |
} |
public double getPerimeter() { |
double p = 2*3.14*r; |
return p; |
} |
public double getArea() { |
double a = 3.14*r*r; |
return a; |
} |
} |
