Problem:
Circle

Write a program which calculates the area and circumference of a circle for given radius r.

Input

A real number r is given.

Output

Print the area and circumference of the circle in a line. Put a single space between them. The output should not contain an absolute error greater than 10-5.

Constraints

0 < r < 10000

Sample Input 1

2

Sample Output 1

12.566371 12.566371

Sample Input 2

3

Sample Output 2

28.274334 18.849556

Solution in JAVA (judge verdict: Accepted)



import java.io.BufferedReader;
import java.io.InputStreamReader;
 
public class Main {
 
    public static void main(String[] args) throws Exception {
        // TODO ?????????????????????????????????????????????
         
        boolean first=true;
        try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
            String line;
            int i=0;
            while ((line = br.readLine()) != null) {
                double r=Double.parseDouble(line);
                System.out.println(String.format("%.6f",r*r*Math.PI)+" "+String.format("%.6f",2*r*Math.PI));
                 
                break;
            }
        }
    }
}