// A Swing applet

import javax.swing.*;

public class BodyMassIndexUK extends JApplet
  {
  public void init()
    {
    String Height;
    String Weight;
    String AddOn;
    double h=2, w=80;
    Double Bmi; 
    int index,rep;
    boolean error=true;
    boolean again=true;

    while (again==true)
      {
      while (error==true)
        {
        error=false;
        Height = JOptionPane.showInputDialog("Enter your height\nin meters");
        while (Height==null||Height.length()==0)
          {
          Height = JOptionPane.showInputDialog("Enter your height\nin meters");
          }
        Weight = JOptionPane.showInputDialog("Enter your weight\nin kilograms");
        while (Weight==null||Weight.length()==0)
          {
          Weight = JOptionPane.showInputDialog("Enter your weight\nin kilograms");
          }
        try
          {
          h = Double.parseDouble(Height);
          w = Double.parseDouble(Weight);
          if (h>2.5||h<1.3||w>200||w<20) 
            {
            error=true;
            JOptionPane.showMessageDialog(null,"Are these the right numbers?\nTry again","INPUT?",JOptionPane.ERROR_MESSAGE);
            } 
          }
        catch(Exception e)
          {
          JOptionPane.showMessageDialog(null,"Input error",
                                          "ERROR",JOptionPane.ERROR_MESSAGE);
          error=true;
          }   
        }  // end while error
      Bmi = new Double((w/(h*h))+0.5);
      index = Bmi.intValue();
      if (index>30) AddOn="This is far too much!";
      else if (index>25) AddOn="That is somewhat high";
      else if (index>21) AddOn="That is OK";
      else if (index>19) AddOn="That is excellent";
      else if (index>15) AddOn="You may have a problem";
      else AddOn="Something is wrong\nSeek medical advice!";
               
      JOptionPane.showMessageDialog(null,"Your Body Mass Index is "+index+"\n"+AddOn,
			"Body Mass Index",JOptionPane.INFORMATION_MESSAGE);

      Object[] options = { "Yes", "No" };
      rep=JOptionPane.showOptionDialog(null, "Try again?", "Body Mass Index",JOptionPane.YES_OPTION,JOptionPane.QUESTION_MESSAGE,null, options, options[0]);
      if (rep==1)again=false;
      error=true;
      } // end while again
    } // end init()
  } // end all