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.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main (String[] args) throws IOException {
        double r,x,y;
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder builder = new StringBuilder();
        String data = reader.readLine();
        r = Double.parseDouble(data);

        x = r * r * Math.PI;
        y = 2 * r * Math.PI;
        
        builder
           .append(String.format("%.6f",x))
           .append(" ")
           .append(String.format("%.6f",y));
        System.out.println(builder);        
    }
}