Computer and Programming

import java.util.*;
public class lingk{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
        double phi = 3.14;
        double r, luas;
System.out.println("Program Luas Lingkaran\n");
System.out.print("Masukkan Panjang Jari-jari : ");
         r = input.nextDouble();
         luas = 0.5 * phi * r * r;
System.out.print("lingk= " + luas + "\n\n");
}
}