package 实验十;
 
import java.awt.*;
import java.awt.event.*;
public class Jisuanqi {
    public static void main(String[] args){
        new MyFrame("计算器");
    }
}
class MyFrame extends Frame{
    private static final long serialVersionUID = 1L;
    private TextArea ta;
    public MyFrame(String title){
        super(title);
        SetTextAreas();
        SetButtonArea();
        SetMainFram();
    }
    private void SetButtonArea() {
        addButton("7",33,28,20,128);
        addButton("8",33,28,58,128);
        addButton("9",33,28,96,128);
        addButton("/",33,28,134,128);
        addButton("%",33,28,172,128);
        addButton("4",33,28,20,160);
        addButton("5",33,28,58,160);
        addButton("6",33,28,96,160);
        addButton("*",33,28,134,160);
        addButton("1/x",33,28,172,160);
        addButton("1",33,28,20,192);
        addButton("2",33,28,58,192);
        addButton("3",33,28,96,192);
        addButton("-",33,28,134,192);
        addButton("0",71,28,20,224);
        addButton(".",33,28,96,224);
        addButton("+",33,28,134,224);
        addButton("=",33,60,172,192);
    }
    double m,n;
    String k;
    boolean flag =true;
    boolean flag2 =false;
    private void addButton(String string, int i, int j,int x,int y) {
        final Button b = new Button(string);
        b.setLocation(x, y);
        b.setSize(i, j);
        b.setFont(new Font("标楷体", Font.BOLD, 15));
        b.setBackground(Color.pink);
        b.setForeground(Color.darkGray);
        b.addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                counts();
            }
            private void counts() {
                if(ta.getText().equals("")&&(b.getActionCommand().equals("+")||
                        b.getActionCommand().equals("-")||
                        b.getActionCommand().equals("*")||
                        b.getActionCommand().equals("/")||
                        b.getActionCommand().equals("%")||
                        b.getActionCommand().equals("1/x")||
                        b.getActionCommand().equals("="))) {}
                else if(ta.getText().equals(".")&&(b.getActionCommand().equals("+")||
                        b.getActionCommand().equals("-")||
                        b.getActionCommand().equals("*")||
                        b.getActionCommand().equals("/")||
                        b.getActionCommand().equals("%")||
                        b.getActionCommand().equals("1/x")||
                        b.getActionCommand().equals("="))){}
                else {
                    if( b.getActionCommand().equals("+")||
                            b.getActionCommand().equals("-")||
                            b.getActionCommand().equals("*")||
                            b.getActionCommand().equals("%")||
                            b.getActionCommand().equals("1/x")||
                            b.getActionCommand().equals("/")){
                        if(flag2 = true) {
                            flag2 = false;
                        }
                        if(flag) {
                            n = new Double(ta.getText()).doubleValue();
                            flag = false;
                        }
                        else {
                            if(k=="="){}
                            else {
                                m = new Double(ta.getText()).doubleValue();
                                if(k == "-") {
                                    if(n==0)
                                        n = m;
                                    else
                                        n=n-m;
                                }
                                else if(k == "+") {
                                    if(n==0)
                                        n = m;
                                    else
                                        n=n+m;
                                    }else if(k == "*") {
                                        if(n==0)
                                            n = m;
                                        else
                                            n=n*m;
                                    }
                                    else if(k=="%"){
                                        if(n==0)
                                            n=m;
                                        else
                                            m=m*100;
                                    }
                                    else if(k=="1/x"){
                                        if(n==0)
                                            n=m;
                                        else
                                            n=1/m;
                                    }
                                    else if(k == "/") {
                                        if(n==0)
                                            n = m;
                                        else
                                            n=n/m;
                                    }
                            }
                        }
                        k = b.getActionCommand();
                        ta.setText("");
                    }
                    else if(b.getActionCommand().equals("=")) {
                        m = new Double(ta.getText()).doubleValue();
                        if(k == "+") {
                            ta.setText("");
                            ta.append(n+"+"+m);
                            ta.append(System.getProperty("line.separator"));
                            n = n+m;
                            ta.append("="+n);
                        }
                        else if(k == "-") {
                            ta.setText("");
                            ta.append(n+"-"+m);
                            ta.append(System.getProperty("line.separator"));
                            n = n-m;
                            ta.append("="+n);
                        }
                        else if(k == "*") {
                            ta.setText("");
                            ta.append(n+"*"+m);
                            ta.append(System.getProperty("line.separator"));
                            n = n*m;
                            ta.append("="+n);
                        }
                        else if(k == "%") {
                            ta.setText("");
                            ta.append("%"+m);
                            ta.append(System.getProperty("line.separator"));
                            m = m*100;
                            ta.append("="+m+"%");
                        }
                        else if(k == "1/x") {
                            ta.setText("");
                            ta.append(1+"/"+m);
                            ta.append(System.getProperty("line.separator"));
                            n = 1/m;
                            ta.append("="+n);
                        }
                        else if(k == "/") {
                            ta.setText("");
                            ta.append(n+"/"+m);
                            ta.append(System.getProperty("line.separator"));
                            n= n/m;
                            ta.append("="+n);
                        }
                        k="=";
                        flag2 = true;
                    }
                    else {
                        if(flag2) {
                            flag = true;
                            flag2 = false;
                            ta.setText("");
                            m = n =0;
                        }
                        ta.append(b.getActionCommand());
                    }
                }
            }
        });
        this.add(b);
    }
    private void SetTextAreas() {
        ta = new TextArea("0",8,52,3);
        ta.setBackground(Color.lightGray);
        ta.setSize(190, 50);
        ta.setFont(new Font("标楷体", Font.BOLD, 15));
        ta.setLocation(20,60);
        this.add(ta);
        this.add(ta);
    }
    @SuppressWarnings("deprecation")
    private void SetMainFram() {
        this.setLayout(null);
        this.setSize(220,270);
        this.setVisible(true);
        this.setLocation(310, 340);
        this.setResizable(false);
        ta.setEditable(false);
        this.setCursor(Cursor.HAND_CURSOR);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}