luaslingkaran.class

//import java.util.*;
//import java.io.*;
import javax.swing.*;//import me

public class luas_lingkaran
{

    public static void main(String[] args) {
        String i_diameter;
        double phi=3.14;
        double d,r,luas ;

        i_diameter = JOptionPane.showInputDialog("Masukkan diameter : ");
        d=Integer.parseInt(i_diameter);
        /*
         * mencari jari-jari
         * input diameter di bagi 2
         *
           */
        r=d/2;
        luas=phi*r*r;
        //JOptionPane.showInputDialog(null,"alas = "+a+" tinggi ="+t+" Luas  = "+luas);
        JOptionPane.showMessageDialog (null, "diameter = "+d+" \njari-jari ="+r+ "\nluas = "  +luas, "Luas lingkaran",JOptionPane.PLAIN_MESSAGE);
    }

    }