Thread: Please help with calculator program

Originally Posted by dipizamora

This is the code... I'm trying to input multiple numbers but it only solves two numbers...

Can you explain this in more detail? Explain it as if we don't have a clue as to anything about your program or how it works.

You'll want to edit your post above and wrap the code in [code] [/code] tags so that it retains its formatting and is readable. Note the difference?:

public class Calculator extends JFrame{
    private JPanel panel;
    private JTextField display;
    private JButton[] button;
    static String lastCommand = null;
    double res;
 
    int tmp=0;
    boolean bool=false;
 
    private final String[] btn = {"1","2","3","4","5","6","7","8","9","0","C","+","-","*","/","="};
    public Calculator() {
        GridLayout gridLayout = new GridLayout(4,4,5,5);
        panel = new JPanel(gridLayout);
        display = new JTextField("0");
 
        display.setFont(new Font("Arial",Font.BOLD,40));
        display.setHorizontalAlignment(JTextField.RIGHT);
        display.setEditable(false);
 
        add(display,BorderLayout.NORTH);
        add(panel, BorderLayout.SOUTH);
 
        button = new JButton[16];
        HandlerClass handler = new HandlerClass();
        for(int i=0;i<btn.length;i++)
        {
            button[i] = new JButton(btn[i]);
            button[i].setForeground(Color.red);
            button[i].setFont(new Font("Arial",Font.BOLD,30));
            panel.add(button[i]);
            button[i].addActionListener(handler);
        }
    }
    private class HandlerClass implements ActionListener{
        public void actionPerformed(ActionEvent e) {
 
            String clickBtn = e.getActionCommand();
 
            if(clickBtn.equalsIgnoreCase("C"))
            {
               display.setText("0");
 
            }
 
 
            else if(clickBtn.equals("+"))
            {
 
                lastCommand="+";
                tmp = Integer.parseInt(display.getText());
                bool = true;
 
            }
 
            else if(clickBtn.equals("-"))
            {
 
                lastCommand="-";
                tmp = Integer.parseInt(display.getText());
                bool = true;
 
            }
 
            else if(clickBtn.equals("*"))
            {
 
                lastCommand="*";
                tmp = Integer.parseInt(display.getText());
                bool = true;
 
            }
 
            else if(clickBtn.equals("/"))
            {
 
                lastCommand="/";
                tmp = Integer.parseInt(display.getText());
                display.setText("0");
 
            }
 
            else if (clickBtn.equalsIgnoreCase("="))
            {
 
 
                 double num2 = Integer.parseInt(display.getText());
                 if(lastCommand.equals("+"))
                 {
                 display.setText(String.valueOf(num2+tmp));
                 res=num2+tmp;
                 }
 
                else if(lastCommand.equals("-"))
                 {
                 display.setText(String.valueOf(tmp-num2));
                 res=tmp-num2;
                 }
 
                else if(lastCommand.equals("*"))
                 {
                 display.setText(String.valueOf(num2*tmp));
                 res=num2*tmp;
                 }
 
                else if(lastCommand.equals("/"))
                 {
                 try{
 
                 display.setText(String.valueOf(tmp/num2));
                    if(num2 == 0)
                    {
                        display.setText("Error");
                    }
 
                 res=tmp/num2;
                 }catch(ArithmeticException x)
                 {
                     display.setText("");
                 }
                 }
 
            }
 
            else
            {
                if(display.getText().equals("0") || bool==true)
                {
                    display.setText("");
                    bool = false;
                }
                    display.setText(display.getText()+e.getActionCommand());
 
            }
 
        }
    }
 
}

I'm sorry. I'm just new here. It's confusing. Anyway, the problem with the program is that we are trying to solve multiple mathematical operations to input numbers but it only solves the first two numbers. For example: 2+2+2+2+2+2 = 4. That's the problem.

Which part of your code was written to handle the third number?

Originally Posted by jps

Which part of your code was written to handle the third number?

And which parts were written by you vs which parts were borrowed from online sources? It's important for us to know which part of the code you fully understand and which parts you might not understand as well.