/* Калькулятор */
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.io.*;

public class Calculator extends Applet {
  boolean isStandalone = false;
  
  int Op=0,flagErase=0,oldOp=0,flagOp=0;
  double Acum = 0.0;
  double Buff=0.0;
  
  TextField textFieldDisplay = new TextField();
  Button buttonC = new Button();
  Button button2 = new Button();
  Button button4 = new Button();
  Button button1 = new Button();
  Button button5 = new Button();
  Button button6 = new Button();
  Button button7 = new Button();
  Button button8 = new Button();
  Button button9 = new Button();
  Button button3 = new Button();
  TextField textFieldMemory1 = new TextField();
  TextField textFieldMemory2 = new TextField();
  TextField textFieldMemory3 = new TextField();
  TextField textFieldMemory4 = new TextField();
  TextField textFieldMemory5 = new TextField();
  TextField textFieldMemory6 = new TextField();
  TextField textFieldMemory7 = new TextField();
  TextField textFieldMemory8 = new TextField();
  TextField textFieldMemory9 = new TextField();
  TextField textFieldMemory10 = new TextField();
  
  
  Label label1 = new Label();
  Label label2 = new Label();
  Label label3 = new Label();
  Label label4 = new Label();
  Label label5 = new Label();
  Label label6 = new Label();
  Label label7 = new Label();
  Label label8 = new Label();
  Label label9 = new Label();
  Label label10 = new Label();
  
  Button button0 = new Button();
  Button buttonComma = new Button();
  Button buttonCS = new Button();
  Button buttonPl = new Button();
  Button buttonMin = new Button();
  Button buttonDiv = new Button();
  Button buttonMul = new Button();
  Button buttonEq = new Button();
  
  Button buttonM1 = new Button("MR1");
  Button buttonM2 = new Button("MR2");  
  Button buttonM3 = new Button("MR3");
  Button buttonM4 = new Button("MR4");
  Button buttonM5 = new Button("MR5");
  Button buttonM6 = new Button("MR6");
  Button buttonM7 = new Button("MR7");
  Button buttonM8 = new Button("MR8");
  Button buttonM9 = new Button("MR9");
  Button buttonM10 = new Button("MR10");
  
  //Construct the applet

  public Calculator() {
  }
//Initialize the applet

  public void init() {
    try {
    jbInit();
    }
    catch (Exception e) {
    e.printStackTrace();
    }
  }

//Component initialization

  private void jbInit() throws Exception {
  this.setBackground(new Color(232, 232, 232));
    
    textFieldDisplay.setBackground(Color.white);
    textFieldDisplay.setText("0");

    textFieldDisplay.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
      }
    });
    buttonC.setLabel("C");
    buttonC.setForeground(Color.red);
    buttonC.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonC_actionPerformed(e);
      }
    });
    button2.setLabel("2");
    button2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button2_actionPerformed(e);
      }
    });
    buttonCS.setLabel("+/-");
    buttonCS.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonCS_actionPerformed(e);
      }
    });

    buttonM1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM1_actionPerformed(e);
      }
    });

    buttonM2.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM2_actionPerformed(e);
      }
    });

    buttonM3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM3_actionPerformed(e);
      }
    });

    buttonM4.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM4_actionPerformed(e);
      }
    });

    buttonM5.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM5_actionPerformed(e);
      }
    });

    buttonM6.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM6_actionPerformed(e);
      }
    });

    buttonM7.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM7_actionPerformed(e);
      }
    });

    buttonM8.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM8_actionPerformed(e);
      }
    });

    buttonM9.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM9_actionPerformed(e);
      }
    });

    buttonM10.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonM10_actionPerformed(e);
      }
    });



    button4.setLabel("4");
    button4.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button4_actionPerformed(e);
      }
    });
    button1.setLabel("1");
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    button5.setLabel("5");
    button5.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button5_actionPerformed(e);
      }
    });
    button6.setLabel("6");
    button6.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button6_actionPerformed(e);
      }
    });
    button7.setLabel("7");
    button7.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button7_actionPerformed(e);
      }
    });
    button8.setLabel("8");
    button8.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button8_actionPerformed(e);
      }
    });
    button9.setLabel("9");
    button9.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button9_actionPerformed(e);
      }
    });
    button3.setLabel("3");
    button3.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button3_actionPerformed(e);
      }
    });
    
    
    textFieldMemory1.setBackground(Color.white);
    textFieldMemory1.setText("0");
    textFieldMemory1.setEditable(false);
    textFieldMemory1.setBackground(Color.white);
    
    textFieldMemory2.setBackground(Color.white);
    textFieldMemory2.setText("0");
    textFieldMemory2.setEditable(false);
    textFieldMemory2.setBackground(Color.white);

    textFieldMemory3.setBackground(Color.white);
    textFieldMemory3.setText("0");
    textFieldMemory3.setEditable(false);
    textFieldMemory3.setBackground(Color.white);

    textFieldMemory4.setBackground(Color.white);
    textFieldMemory4.setText("0");
    textFieldMemory4.setEditable(false);
    textFieldMemory4.setBackground(Color.white);

    textFieldMemory5.setBackground(Color.white);
    textFieldMemory5.setText("0");
    textFieldMemory5.setEditable(false);
    textFieldMemory5.setBackground(Color.white);

    textFieldMemory6.setBackground(Color.white);
    textFieldMemory6.setText("0");
    textFieldMemory6.setEditable(false);
    textFieldMemory6.setBackground(Color.white);


    textFieldMemory7.setBackground(Color.white);
    textFieldMemory7.setText("0");
    textFieldMemory7.setEditable(false);
    textFieldMemory7.setBackground(Color.white);

    textFieldMemory8.setBackground(Color.white);
    textFieldMemory8.setText("0");
    textFieldMemory8.setEditable(false);
    textFieldMemory8.setBackground(Color.white);

    textFieldMemory9.setBackground(Color.white);
    textFieldMemory9.setText("0");
    textFieldMemory9.setEditable(false);
    textFieldMemory9.setBackground(Color.white);

    textFieldMemory10.setBackground(Color.white);
    textFieldMemory10.setText("0");
    textFieldMemory10.setEditable(false);
    textFieldMemory10.setBackground(Color.white);

    
    label1.setFont(new Font("Dialog", 1, 12));
    label1.setText("Memory1");
    label1.setForeground(Color.red);

    label2.setFont(new Font("Dialog", 1, 12));
    label2.setText("Memory2");
    label2.setForeground(Color.red);

    label3.setFont(new Font("Dialog", 1, 12));
    label3.setText("Memory3");
    label3.setForeground(Color.red);

    label4.setFont(new Font("Dialog", 1, 12));
    label4.setText("Memory4");
    label4.setForeground(Color.red);

    label5.setFont(new Font("Dialog", 1, 12));
    label5.setText("Memory5");
    label5.setForeground(Color.red);

    label6.setFont(new Font("Dialog", 1, 12));
    label6.setText("Memory6");
    label6.setForeground(Color.red);

    label7.setFont(new Font("Dialog", 1, 12));
    label7.setText("Memory7");
    label7.setForeground(Color.red);

    label8.setFont(new Font("Dialog", 1, 12));
    label8.setText("Memory8");
    label8.setForeground(Color.red);

    label9.setFont(new Font("Dialog", 1, 12));
    label9.setText("Memory9");
    label9.setForeground(Color.red);

    label10.setFont(new Font("Dialog", 1, 12));
    label10.setText("Memory10");
    label10.setForeground(Color.red);
    
    textFieldDisplay.setEditable(false);

    button0.setLabel("0");
    button0.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button0_actionPerformed(e);
      }
    });
    buttonComma.setLabel(",");
    buttonComma.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonComma_actionPerformed(e);
      }
    });
    buttonPl.setForeground(Color.blue);
    buttonPl.setLabel("+");
    buttonPl.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonPl_actionPerformed(e);
      }
    });
    buttonMin.setForeground(Color.blue);
    buttonMin.setLabel("-");
    buttonMin.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonMin_actionPerformed(e);
      }
    });
    buttonDiv.setFont(new Font("Dialog", 1, 12));
    buttonDiv.setForeground(Color.blue);
    buttonDiv.setLabel("/");
    buttonDiv.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonDiv_actionPerformed(e);
      }
    });
    buttonMul.setForeground(Color.blue);
    buttonMul.setLabel("*");
    buttonMul.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonMul_actionPerformed(e);
      }
    });

    buttonEq.setForeground(Color.red);
    buttonEq.setLabel("=");
    buttonEq.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        buttonEq_actionPerformed(e);
      }
    });
    

    this.setLayout(null);
    this.add(textFieldDisplay); textFieldDisplay.setBounds(9, 7, 230, 22);
    
    
    this.add(buttonC); buttonC.setBounds(265, 66, 202, 27);    
    this.add(button2); button2.setBounds(265+42, 155, 37, 27);
    this.add(button4); button4.setBounds(265, 125, 37, 27);
    this.add(button1); button1.setBounds(265, 155, 37, 27);
    this.add(button5); button5.setBounds(265+42, 125, 37, 27);
    this.add(button6); button6.setBounds(265+84, 125, 37, 27);
    this.add(button7); button7.setBounds(265, 95, 37, 27);
    this.add(button8); button8.setBounds(265+42, 95, 37, 27);
    this.add(button9); button9.setBounds(265+84, 95, 37, 27);
    this.add(button3); button3.setBounds(265+84, 155, 37, 27);
    this.add(buttonCS); buttonCS.setBounds(265+84, 185, 37, 27);
    
    this.add(textFieldMemory1);  textFieldMemory1.setBounds(63, 35,  139, 22);
    this.add(textFieldMemory2);  textFieldMemory2.setBounds(63, 60,  139, 22);
    this.add(textFieldMemory3);  textFieldMemory3.setBounds(63, 85,  139, 22);
    this.add(textFieldMemory4);  textFieldMemory4.setBounds(63, 110, 139, 22);
    this.add(textFieldMemory5);  textFieldMemory5.setBounds(63, 135, 139, 22);
    this.add(textFieldMemory6);  textFieldMemory6.setBounds(63, 160, 139, 22);
    this.add(textFieldMemory7);  textFieldMemory7.setBounds(63, 185, 139, 22);
    this.add(textFieldMemory8);  textFieldMemory8.setBounds(63, 210, 139, 22);
    this.add(textFieldMemory9);  textFieldMemory9.setBounds(63, 235, 139, 22);
    this.add(textFieldMemory10); textFieldMemory10.setBounds(63,260, 139, 22);

    this.add(label1);  label1.setBounds(2, 35, 58, 18);
    this.add(label2);  label2.setBounds(2, 60, 58, 18);
    this.add(label3);  label3.setBounds(2, 85, 58, 18);
    this.add(label4);  label4.setBounds(2, 110, 58, 18);
    this.add(label5);  label5.setBounds(2, 135, 58, 18);
    this.add(label6);  label6.setBounds(2, 160, 58, 18);
    this.add(label7);  label7.setBounds(2, 185, 58, 18);
    this.add(label8);  label8.setBounds(2, 210, 58, 18);
    this.add(label9);  label9.setBounds(2, 235, 58, 18);
    this.add(label10); label10.setBounds(2,260, 58, 18);

    this.add(buttonM1); buttonM1.setBounds(205, 35, 37, 22);
    this.add(buttonM2); buttonM2.setBounds(205, 60, 37, 22);
    this.add(buttonM3); buttonM3.setBounds(205, 85, 37, 22);
    this.add(buttonM4); buttonM4.setBounds(205, 110, 37, 22);
    this.add(buttonM5); buttonM5.setBounds(205, 135, 37, 22);
    this.add(buttonM6); buttonM6.setBounds(205, 160, 37, 22);
    this.add(buttonM7); buttonM7.setBounds(205, 185, 37, 22);
    this.add(buttonM8); buttonM8.setBounds(205, 210, 37, 22);
    this.add(buttonM9); buttonM9.setBounds(205, 235, 37, 22);
    this.add(buttonM10); buttonM10.setBounds(205, 260, 37, 22);

    
    this.add(button0); button0.setBounds(265, 185, 37, 27);
    this.add(buttonComma); buttonComma.setBounds(265+42, 185, 37, 27);
    this.add(buttonPl); buttonPl.setBounds(265+142, 185, 60, 27);
    this.add(buttonMin); buttonMin.setBounds(265+142, 124, 60, 27);
    this.add(buttonDiv); buttonDiv.setBounds(265+142, 95, 60, 27);
    this.add(buttonMul); buttonMul.setBounds(265+142, 155, 60, 27);
    
    this.add(buttonEq); buttonEq.setBounds(265, 215, 202, 27);

  }

void doCalc()
  {
   
   try{
    if(Op!=0)
    {
     Buff = parseDouble(textFieldDisplay.getText());
     oldOp=Op;
    }
    else
    {
      Op=oldOp;
      Acum = parseDouble(textFieldDisplay.getText());
    }

    switch(Op)
    {
     case 1:
        Acum += Buff;
        break;
     case 2:
        Acum -= Buff;
        break;
     case 3:
        Acum *= Buff;
        break;
     case 4:
        Acum /= Buff;
        break;
    }

    textFieldDisplay.setText(String.valueOf(Acum));
    oldOp=Op;
    Op=0;
    flagErase=1;
    
    textFieldMemory10.setText(textFieldMemory9.getText());
    textFieldMemory9.setText(textFieldMemory8.getText());
    textFieldMemory8.setText(textFieldMemory7.getText());
    textFieldMemory7.setText(textFieldMemory6.getText());
    textFieldMemory6.setText(textFieldMemory5.getText());
    textFieldMemory5.setText(textFieldMemory4.getText());
    textFieldMemory4.setText(textFieldMemory3.getText());
    textFieldMemory3.setText(textFieldMemory2.getText());
    textFieldMemory2.setText(textFieldMemory1.getText());
    textFieldMemory1.setText(textFieldDisplay.getText());     
   }catch (Exception e){
    System.err.println(e.getMessage());
    }
  }
   
 
//----------------------------------------------------------------------------

 double parseDouble(String s)
 {
   double result=0.0;
   long f=0,f2=0;
   int i=0,j=0,k=0;
   String s1="",s2="",s3="";
   try{
     k=s.indexOf('E');
     if(k<0)
     {
       j=s.indexOf('.');
       if (j>=0)
       {
         s1=s.substring(j+1);
         f=Long.parseLong(s1,10);
         s2=s.substring(0,j);
         i=s1.length();
         result=Math.pow(10,i);
         result=f/result;
         f=Long.parseLong(s2,10);
         if(f>=0)
           result=(double)(result+f);
         else
           result=(double)(f-result);
       }

       else
     result=(double)(Long.parseLong(s));
     }

     else
     {
       j=s.indexOf('.');;
       s1=s.substring(j+1,k);
       f=Long.parseLong(s1,10);
       s2=s.substring(0,j);
       i=s1.length();
       result=Math.pow(10,i);
       result=(double)(f/result);
       f=Long.parseLong(s2,10);

       if(f>=0)
         result=(double)(result+f);
       else
         result=(double)(f-result);

       s3=s.substring(k+1);
       f2=Long.parseLong(s3,10);

       if(f2>0)
         result=(double)(result*Math.pow(10,f2));
       else
         result=(double)(result/Math.pow(10,-f2));
     }
   }catch (Exception e){
    System.err.println(e.getMessage());
    }
   return result;
 }

//----------------------------------------------------------------------------
  void if_thero() {
   if(((textFieldDisplay.getText().compareTo("0"))==0)||(flagErase!=0))
    { textFieldDisplay.setText("");
      flagErase = 0;
    }
   }
//----------------------------------------------------------------------------

//--------------------Обработчики событий-------------------------------------  
  void buttonC_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText("0");
    Acum=0.0;Op=0;oldOp=0;flagOp=0;
  }

  void buttonComma_actionPerformed(ActionEvent e) {
     if(flagOp==1)
       textFieldDisplay.setText("0.");
     if(textFieldDisplay.getText().indexOf(".")==-1)
       {
         textFieldDisplay.setText(textFieldDisplay.getText()+".");
         flagOp=0;
       }  
  }

  void button0_actionPerformed(ActionEvent e) {
    if_thero();
    textFieldDisplay.setText(textFieldDisplay.getText()+"0");
    flagOp=0;
  }

  void button1_actionPerformed(ActionEvent e) {
     if_thero();
     textFieldDisplay.setText(textFieldDisplay.getText()+"1");
     flagOp=0;
  }

  void button2_actionPerformed(ActionEvent e) {
      if_thero();
      textFieldDisplay.setText(textFieldDisplay.getText()+"2");
      flagOp=0;
  }
  
  void buttonCS_actionPerformed(ActionEvent e) {
      if(textFieldDisplay.getText().substring(0,1).equals("-"))
        textFieldDisplay.setText(textFieldDisplay.getText().substring(1));
      else
        textFieldDisplay.setText("-"+textFieldDisplay.getText());
  }

  void button3_actionPerformed(ActionEvent e) {
      if_thero();
      textFieldDisplay.setText(textFieldDisplay.getText()+"3");
      flagOp=0;
  }

  void button4_actionPerformed(ActionEvent e) {
      if_thero();
      textFieldDisplay.setText(textFieldDisplay.getText()+"4");
      flagOp=0;
  }

  void button5_actionPerformed(ActionEvent e) {
      if_thero();
      textFieldDisplay.setText(textFieldDisplay.getText()+"5");
      flagOp=0;
  }

  void button6_actionPerformed(ActionEvent e) {
      if_thero();
      textFieldDisplay.setText(textFieldDisplay.getText()+"6");
      flagOp=0;
  }

  void button7_actionPerformed(ActionEvent e) {
      if_thero();
      textFieldDisplay.setText(textFieldDisplay.getText()+"7");
      flagOp=0;
  }

  void button8_actionPerformed(ActionEvent e) {
      if_thero();
      textFieldDisplay.setText(textFieldDisplay.getText()+"8");
      flagOp=0;
  }

  void button9_actionPerformed(ActionEvent e) {
      if_thero();
      textFieldDisplay.setText(textFieldDisplay.getText()+"9");
 	  flagOp=0; 
  }



  void buttonPl_actionPerformed(ActionEvent e) {
    if ((Op!=0)&&(flagOp==0)) doCalc();
    Acum = parseDouble(textFieldDisplay.getText());
    Op=1;flagErase=1;flagOp=1; 
  }

  void buttonMin_actionPerformed(ActionEvent e) {
    if ((Op!=0)&&(flagOp==0)) doCalc();
    Acum = parseDouble(textFieldDisplay.getText());
    Op=2;flagErase=1;flagOp=1;
  }

  void buttonMul_actionPerformed(ActionEvent e) {
    if ((Op!=0)&&(flagOp==0)) doCalc();
    Acum = parseDouble(textFieldDisplay.getText());  
    Op=3;flagErase=1;flagOp=1;
  }

  void buttonDiv_actionPerformed(ActionEvent e) {
    if ((Op!=0)&&(flagOp==0)) doCalc();
    Acum = parseDouble(textFieldDisplay.getText());
    Op=4;flagErase=1;flagOp=1;
  }

  void buttonM1_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory1.getText());
    flagOp=0;
  }

  void buttonM2_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory2.getText());
    flagOp=0;
  }

  void buttonM3_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory3.getText());
    flagOp=0;
  }

  void buttonM4_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory4.getText());
    flagOp=0;
  }

  void buttonM5_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory5.getText());
    flagOp=0;
  }

  void buttonM6_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory6.getText());
    flagOp=0;
  }

  void buttonM7_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory7.getText());
    flagOp=0;
  }

  void buttonM8_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory8.getText());
    flagOp=0;
  }

  void buttonM9_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory9.getText());
    flagOp=0;
  }

  void buttonM10_actionPerformed(ActionEvent e) {
    textFieldDisplay.setText(textFieldMemory10.getText());
    flagOp=0;
  }

  void buttonEq_actionPerformed(ActionEvent e) {
     doCalc();
     flagOp=0;
  }
}