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


public class aa extends JFrame implements ActionListener {

    private static final long serialVersionUID = 1L;
    float numA = 0;
    static JTextArea ans = new JTextArea(1,15);
    static JMenuBar menuB = new JMenuBar();
    static JMenu menu = new JMenu("File");
    JMenuItem graph = new JMenuItem("Graph");

    JButton clr = new JButton("clr");
    JButton sqr = new JButton("^2");
    JButton pow = new JButton("^x");
    JButton pnB = new JButton("+/-");
    JButton deci = new JButton(".");

    JButton addB = new JButton("+");
    JButton subB = new JButton("-");
    JButton mulB = new JButton("*");
    JButton divB = new JButton("%");
    JButton equB = new JButton("=");

    JButton key1 = new JButton("1");
    JButton key2 = new JButton("2");
    JButton key3 = new JButton("3");
    JButton key4 = new JButton("4");
    JButton key5 = new JButton("5");
    JButton key6 = new JButton("6");
    JButton key7 = new JButton("7");
    JButton key8 = new JButton("8");
    JButton key9 = new JButton("9");
    JButton key0 = new JButton("0");

    float x = 0;
    float y = 0;

    String operator;
    String lastP;

    public static void main(String[] args) {
        aa app =new aa();
        app.setTitle("Calculator");
    }

    public aa(){
        this.setJMenuBar(menuB);
            menuB.add(menu);
                menu.add(graph);
                    graph.addActionListener(this);
        this.setVisible(true);
        this.setLocationRelativeTo(null);
        this.setSize(230, 240);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        //JPanel content = new JPanel();
        this.setLayout(new FlowLayout());
        this.add(ans);
            ans.setEditable(false);

        this.add(clr);
            clr.addActionListener(this);
        this.add(sqr);
            sqr.addActionListener(this);
        this.add(pow);
            pow.addActionListener(this);
        this.add(pnB);
            pnB.addActionListener(this);

        this.add(key1);
            key1.addActionListener(this);
        this.add(key2);
            key2.addActionListener(this);
        this.add(key3);
            key3.addActionListener(this);

            this.add(addB);
            addB.addActionListener(this);

        this.add(key4);
            key4.addActionListener(this);
        this.add(key5);
            key5.addActionListener(this);
        this.add(key6);
            key6.addActionListener(this);

            this.add(subB);
            subB.addActionListener(this);

        this.add(key7);
            key7.addActionListener(this);
        this.add(key8);
            key8.addActionListener(this);
        this.add(key9);
            key9.addActionListener(this);

            this.add(mulB);
            mulB.addActionListener(this);

        this.add(key0);
            key0.addActionListener(this);
        this.add(deci);
            deci.addActionListener(this);

            this.add(equB);
                equB.addActionListener(this);
            this.add(divB);
                divB.addActionListener(this);

    }

    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == this.key1){
            if(lastP == "P"){
                ans.setText(" ");
                operator="";
            }
            ans.append("1");
            lastP = "1";
        }
        if(e.getSource() == this.key2){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("2");
            lastP = "2";
        }
        if(e.getSource() == this.key3){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("3");
            lastP = "3";
        }
        if(e.getSource() == this.key4){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("4");
            lastP = "4";
        }
        if(e.getSource() == this.key5){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("5");
            lastP = "5";
        }
        if(e.getSource() == this.key6){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("6");
            lastP = "6";
        }
        if(e.getSource() == this.key7){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("7");
            lastP = "7";
        }
        if(e.getSource() == this.key8){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("8");
            lastP = "8";
        }
        if(e.getSource() == this.key9){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("9");
            lastP = "9";
        }
        if(e.getSource() == this.key0){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append("0");
            lastP = "0";
        }
        if(e.getSource() == this.addB){
            x =  Float.parseFloat(ans.getText());
            ans.setText("");
            operator = "+";
            lastP = "+";
        }
        if(e.getSource() == this.subB){
            x =  Float.parseFloat(ans.getText());
            ans.setText("");
            operator = "-";
            lastP = "-";
        }
        if(e.getSource() == this.mulB){
            x =  Float.parseFloat(ans.getText());
            ans.setText("");
            operator = "*";
            lastP = "*";
        }
        if(e.getSource() == this.divB){
            x =  Float.parseFloat(ans.getText());
            ans.setText("");
            operator = "/";
            lastP = "/";
        }
        if(e.getSource() == this.pow){
            x = Float.parseFloat(ans.getText());
            ans.setText("");
            operator = "^";
            lastP = "^";
        }
        if(e.getSource() == this.equB){
            lastP = "P";
            if(operator == "+"){
                y = Float.parseFloat(ans.getText());
                numA = x+y;
                ans.setText(numA+"");
            }
            if(operator == "-"){
                y =Float.parseFloat(ans.getText());
                numA = x-y;
                ans.setText(numA+"");
            }
            if(operator == "*"){
                y =Float.parseFloat(ans.getText());
                numA = x*y;
                ans.setText(numA+"");
            }
            if(operator == "/"){
                y = Float.parseFloat(ans.getText());
                numA = x/y;
                ans.setText(numA+"");
            }
            if(operator == "^"){
                y = Float.parseFloat(ans.getText());
                numA = (float) Math.pow(x, y);
                ans.setText(numA+"");
            }
        }
        if(e.getSource() == this.clr){
            ans.setText("");
            operator="";
            lastP = "c";
        }
        if(e.getSource() == this.sqr){
            x = Float.parseFloat(ans.getText());
            numA = x*x;
            ans.setText(numA+"");
            lastP = "^2";
        }
        if(e.getSource() == this.deci){
            if(lastP == "P"){
                ans.setText("");
                operator="";
            }
            ans.append(".");
            lastP = "d";
        }
        if(e.getSource() == this.pnB){
            x = Float.parseFloat(ans.getText());
            numA = x * -1;
            ans.setText(numA+"");
        }
        if(e.getSource() == this.graph){
            //JOptionPane.showMessageDialog(null, "It worked");
            ab grapher = new ab();
        }
    }

}