import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class o1 extends JFrame{
	boolean ok=true;
	JTextField lengthField = new JTextField(10);
	JTextField weightField = new JTextField(10);
	int bmi;
	JLabel result = new JLabel();
	o1(){
		super("BMI");
		setLayout(new GridLayout(4,1));
		
		JPanel mPanel = new JPanel();
		JLabel meter = new JLabel("Your length in meters: ");
		add (mPanel);
		mPanel.add(meter);
		mPanel.add(lengthField);
		
		JPanel wPanel = new JPanel();
		JLabel kg = new JLabel("Your weight in kg; ");
		add (wPanel);
		wPanel.add(kg);
		wPanel.add(weightField);
		
		JPanel bPanel = new JPanel();
		add (bPanel);
		JButton calc = new JButton("Calculate");
		calc.addActionListener(new CalcButton());
		bPanel.add(calc);
		
		JPanel rPanel = new JPanel();
		add (rPanel);
		rPanel.add(new JLabel("Result: "));
		rPanel.add(result);
		
		setSize(360,240);
		setVisible(true);
		}
	
	class CalcButton implements ActionListener{
		public void actionPerformed(ActionEvent ave){
			try{
			double l = Double.parseDouble(lengthField.getText());
			int w = Integer.parseInt(weightField.getText());
			double r = w/(Math.pow(l,2));
			result.setText(String.format("%.2f", r));
			}catch(NumberFormatException e){result.setText("you fail");}
			}
	}

	public static void main (String[]args){
			new o1();
	}
}