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

public class Main
{
    public static void main(String[] args)
    {
        Calculator c=new Calculator();

    }
}

public class Calculator implements ActionListener {
    boolean isButtonClicked = false;
    int mark;
    String oldValue,newValue,oldResult;
    JFrame jf;
    JLabel display_lable;
    JButton sevenButton, eightButton, nineButton, fourButton, fiveButton, sixButton, oneButton, twoButton, threeButton;
    JButton zeroButton, addButton, minusButton, mulButton, divButton, clearButton, equalButton, dotButton,ansButton;

    Calculator() {
        jf = new JFrame("Calculator");
        jf.setLayout(null);
        jf.getContentPane().setBackground(Color.white);
        jf.setSize(700, 630);
        jf.setLocation(50, 50);

        display_lable = new JLabel();
        display_lable.setBounds(20, 30, 620, 60);
        display_lable.setBackground(Color.lightGray);
        display_lable.setFont(new Font("Arial", Font.PLAIN, 40));
        display_lable.setOpaque(true);
        display_lable.setHorizontalAlignment(SwingConstants.RIGHT);
        jf.add(display_lable);

        sevenButton = new JButton("7");
        sevenButton.setBounds(50,130,80,80);
        sevenButton.setFont(new Font("Arial", Font.PLAIN, 40));
        sevenButton.addActionListener(this);
        jf.add(sevenButton);

        eightButton = new JButton("8");
        eightButton.setBounds(160, 130, 80, 80);
        eightButton.setFont(new Font("Arial", Font.PLAIN, 40));
        eightButton.addActionListener(this);
        jf.add(eightButton);

        nineButton = new JButton("9");
        nineButton.setBounds(270, 130, 80, 80);
        nineButton.setFont(new Font("Arial", Font.PLAIN, 40));
        nineButton.addActionListener(this);
        jf.add(nineButton);

        divButton = new JButton("/");
        divButton.setBounds(380, 130, 80, 80);
        divButton.setFont(new Font("Arial", Font.PLAIN, 40));
        divButton.addActionListener(this);
        jf.add(divButton);

        fourButton = new JButton("4");
        fourButton.setBounds(50, 240, 80, 80);
        fourButton.setFont(new Font("Arial", Font.PLAIN, 40));
        fourButton.addActionListener(this);
        jf.add(fourButton);

        fiveButton = new JButton("5");
        fiveButton.setBounds(160, 240, 80, 80);
        fiveButton.setFont(new Font("Arial", Font.PLAIN, 40));
        fiveButton.addActionListener(this);
        jf.add(fiveButton);

        sixButton = new JButton("6");
        sixButton.setBounds(270, 240, 80, 80);
        sixButton.setFont(new Font("Arial", Font.PLAIN, 40));
        sixButton.addActionListener(this);
        jf.add(sixButton);

        mulButton = new JButton("x");
        mulButton.setBounds(380, 240, 80, 80);
        mulButton.setFont(new Font("Arial", Font.PLAIN, 40));
        mulButton.addActionListener(this);
        jf.add(mulButton);

        oneButton = new JButton("1");
        oneButton.setBounds(50, 350, 80, 80);
        oneButton.setFont(new Font("Arial", Font.PLAIN, 40));
        oneButton.addActionListener(this);
        jf.add(oneButton);

        twoButton = new JButton("2");
        twoButton.setBounds(160, 350, 80, 80);
        twoButton.setFont(new Font("Arial", Font.PLAIN, 40));
        twoButton.addActionListener(this);
        jf.add(twoButton);

        threeButton = new JButton("3");
        threeButton.setBounds(270, 350, 80, 80);
        threeButton.setFont(new Font("Arial", Font.PLAIN, 40));
        threeButton.addActionListener(this);
        jf.add(threeButton);

        minusButton = new JButton("-");
        minusButton.setBounds(380, 350, 80, 80);
        minusButton.setFont(new Font("Arial", Font.PLAIN, 40));
        minusButton.addActionListener(this);
        jf.add(minusButton);

        dotButton = new JButton(".");
        dotButton.setBounds(50, 460, 80, 80);
        dotButton.setFont(new Font("Arial", Font.PLAIN, 40));
        dotButton.addActionListener(this);
        jf.add(dotButton);

        zeroButton = new JButton("0");
        zeroButton.setBounds(160, 460, 80, 80);
        zeroButton.setFont(new Font("Arial", Font.PLAIN, 40));
        zeroButton.addActionListener(this);
        jf.add(zeroButton);

        equalButton = new JButton("=");
        equalButton.setBounds(270, 460, 80, 80);
        equalButton.setFont(new Font("Arial", Font.PLAIN, 40));
        equalButton.setBackground(Color.green);
        equalButton.addActionListener(this);
        jf.add(equalButton);

        addButton = new JButton("+");
        addButton.setBounds(380, 460, 80, 80);
        addButton.setFont(new Font("Arial", Font.PLAIN, 40));
        addButton.addActionListener(this);
        jf.add(addButton);

        clearButton = new JButton("clear");
        clearButton.setBounds(490, 130, 80, 80);
        clearButton.setFont(new Font("Arial", Font.PLAIN, 20));
        clearButton.setBackground(Color.red);
        clearButton.addActionListener(this);
        jf.add(clearButton);

        ansButton = new JButton("Ans");
        ansButton.setBounds(490, 240, 80, 80);
        ansButton.setFont(new Font("Arial", Font.PLAIN, 25));
        ansButton.setBackground(Color.ORANGE);
        ansButton.addActionListener(this);
        jf.add(ansButton);

        jf.setVisible(true);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==eightButton){
            if(isButtonClicked){
                display_lable.setText("8");
                isButtonClicked=false;
            }else{
            display_lable.setText(display_lable.getText()+"8");}
        }else if(e.getSource()==sevenButton){
            if(isButtonClicked){
                display_lable.setText("7");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"7");}
        }else if(e.getSource()==nineButton){
            if(isButtonClicked){
                display_lable.setText("9");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"9");}
        }else if(e.getSource()==fourButton){
            if(isButtonClicked){
                display_lable.setText("4");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"4");}
        }else if(e.getSource()==fiveButton){
            if(isButtonClicked){
                display_lable.setText("5");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"5");}
        }else if(e.getSource()==sixButton){
            if(isButtonClicked){
                display_lable.setText("6");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"6");}
        }else if(e.getSource()==oneButton){
            if(isButtonClicked){
                display_lable.setText("1");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"1");}
        }else if(e.getSource()==twoButton){
            if(isButtonClicked){
                display_lable.setText("2");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"2");}
        }else if(e.getSource()==threeButton){
            if(isButtonClicked){
                display_lable.setText("3");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"3");}
        }else if(e.getSource()==zeroButton){
            if(isButtonClicked){
                display_lable.setText("0");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+"0");}
        }else if(e.getSource()==dotButton){
            if(isButtonClicked){
                display_lable.setText(".");
                isButtonClicked=false;
            }else{
                display_lable.setText(display_lable.getText()+".");}
        } else if(e.getSource()==addButton) {
            isButtonClicked=true;
            oldValue=display_lable.getText();
            mark=1;
        }else if(e.getSource()==minusButton) {
            isButtonClicked=true;
            oldValue=display_lable.getText();
            mark=2;
        }else if(e.getSource()==mulButton) {
            isButtonClicked=true;
            oldValue=display_lable.getText();
            mark=3;
        }else if(e.getSource()==divButton) {
            isButtonClicked=true;
            oldValue=display_lable.getText();
            mark=4;
        } else if(e.getSource()==clearButton){
            display_lable.setText("");
        }else if(e.getSource()==ansButton){
            display_lable.setText(oldResult);
        } else if(e.getSource()==equalButton){
            newValue=display_lable.getText();

            float newValueF=Float.parseFloat(newValue);
            float oldValueF=Float.parseFloat(oldValue);

            //going to perform operations

            if(mark==1){
                float result=oldValueF+newValueF;
                display_lable.setText(result+"");
            } else if(mark==2){
                float result=oldValueF-newValueF;
                display_lable.setText(result+"");
            }else if(mark==3){
                float result=oldValueF*newValueF;
                display_lable.setText(result+"");
            }else if(mark==4){
                float result=oldValueF/newValueF;
                display_lable.setText(result+"");
            }
            oldResult=display_lable.getText();
        }
    }
}



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