Menghitung FPB dan KPK Dengan Java Console

Membuat program FPB dan KPK hasila source codenya

import java.util.Scanner;
public class kpkfpb
{
 public static void main(String[] args)
 {
  Scanner baca = new Scanner(System.in);

  int a;
  int b;
  int c;
  int fpb;
  int kpk;
  int x;
  boolean ulang = true;

  do
  {
   System.out.print("\nmasukkan dua buah angka: ");
   a = baca.nextInt();
    baca.nextLine();

   System.out.print(" dan ");
   b = baca.nextInt();
    baca.nextLine();


   x = a * b;
   do
   {
    c = a % b;
    a = b;
    b = c;
   }
   while (b != 0);

   fpb = a;
   kpk = x / fpb;
   System.out.println("\nkpk = "+kpk);
   System.out.println("fpb = "+fpb);


   ulang = true;
  }
  while
  (ulang!=false);

 }
}