Program Java : Mengitung Keliling Lingkaran

Source :
KeLing.java

package keling;
import java.util.Scanner;
/**
 *
 * @author LabTIA-19
 */
public class KeLing {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int r;
        final double phi = 3.14;
        double keliling;
        System.out.print("Masukkan jari-jari : ");
        r = input.nextInt();
        keliling = 2*phi*r;
        System.out.println("2 x "+phi+" x "+r+" = "+keliling);
    }
   
}

Hasil :