source code java menghitung luas & keliling lingkaran

import java.util.Scanner; 
public class soal_101 { 
 public static void main (String[] args) { 
  Scanner masukan = new Scanner(System.in); 
  double r, luas, keliling; 
  double phi=3.14; 
  System.out.print(" masukan nilai jari -jari :"); 
  r = masukan.nextDouble(); 
  System.out.println(); 
  System.out.print(" luas lingkaran :"); 
  luas =0.5 * phi * r * r ; 
  System.out.print(luas); 
  System.out.println(); 
  System.out.print(" keliling lingkaran :"); 
  keliling = 2 * phi * r ; 
  System.out.print(keliling); 
 } 
}

berikut hasil outputnya :