HTML Test Page

Лабораторная работа N6
Выполнил ст. гр. ВТ 97а
Похила Р.Ю.
Задание:
12. Реализовать калькулятор, умеющий рассчитывать
производную выражения, содержащего 4 арифметических действия,
возведение в степень и скобки.
Например: [4*Х^3+5*Х-(4*Х^2+3)^2]` = 12*X^2+5-2*(4*X^2+3)*(8*X).
Отрицательные числа заключать в скобки.

Исходный код на Java, сгенерированный при помощи JBuilder 2

package Calculator;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import borland.jbcl.layout.*;

public class Calculator extends Applet
{
  boolean isStandalone = false;
  int k;
  Button button1 = new Button();
  Button button2 = new Button();
  Button button3 = new Button();
  Button button4 = new Button();
  Button button5 = new Button();
  Button button6 = new Button();
  Button button7 = new Button();
  Button button8 = new Button();
  Button button9 = new Button();
  Button button10 = new Button();
  Panel panel1 = new Panel();
  Label label1 = new Label();
  Label label2 = new Label();
  Button button11 = new Button();
  Button button12 = new Button();
  Button button13 = new Button();
  Button button14 = new Button();
  Button button15 = new Button();
  Button button16 = new Button();
  Button button17 = new Button();
  Button button18 = new Button();
  Button button19 = new Button();
  Button button20 = new Button();
  Button button21 = new Button();
  Button button22 = new Button();

//Construct the applet

public Calculator()
    {
      try
        {
          jbInit();
        }
      catch (Exception e)
        {
          e.printStackTrace();
        }
}
//Initialize the applet

public void init()
{ }

private void jbInit() throws Exception
{
    button1.setBounds(new Rectangle(10, 200, 40, 20));
    button1.setLabel("1");
    button1.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button1_actionPerformed(e);
      }
    });
    button2.setBounds(new Rectangle(60, 200, 40, 20));
    button2.setLabel("2");
    button2.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button2_actionPerformed(e);
      }
    });
    button3.setBounds(new Rectangle(110, 200, 40, 20));
    button3.setLabel("3");
    button3.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button3_actionPerformed(e);
      }
    });
    button4.setBounds(new Rectangle(10, 170, 40, 20));
    button4.setLabel("4");
    button4.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button4_actionPerformed(e);
      }
    });
    button5.setBounds(new Rectangle(60, 170, 40, 20));
    button5.setLabel("5");
    button5.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button5_actionPerformed(e);
      }
    });
    button6.setBounds(new Rectangle(110, 170, 40, 20));
    button6.setLabel("6");
    button6.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button6_actionPerformed(e);
      }
    });
    button7.setBounds(new Rectangle(10, 140, 40, 20));
    button7.setLabel("7");
    button7.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button7_actionPerformed(e);
      }
    });
    button8.setBounds(new Rectangle(60, 140, 40, 20));
    button8.setLabel("8");
    button8.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button8_actionPerformed(e);
      }
    });
    button9.setBounds(new Rectangle(110, 140, 40, 20));
    button9.setLabel("9");
    button9.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button9_actionPerformed(e);
      }
    });
    button10.setBounds(new Rectangle(10, 230, 40, 20));
    button10.setLabel("0");
    button10.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button10_actionPerformed(e);
      }
    });
    panel1.setBackground(new Color(108, 77, 0));
    panel1.setForeground(Color.green);
    panel1.setBounds(new Rectangle(10, 10, 340, 80));
    label1.setForeground(Color.black);
    label1.setBackground(Color.lightGray);
    label1.setBounds(new Rectangle(5, 5, 330, 20));
    label2.setForeground(Color.black);
    label2.setBackground(Color.lightGray);
    label2.setBounds(new Rectangle(5, 35, 330, 20));
    button11.setBounds(new Rectangle(60, 230, 40, 20));
    button11.setLabel(".");
    button11.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button11_actionPerformed(e);
      }
    });
    button12.setBounds(new Rectangle(110, 230, 40, 20));
    button12.setLabel("X");
    button12.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button12_actionPerformed(e);
      }
    });
    button13.setBounds(new Rectangle(160, 140, 40, 20));
    button13.setLabel("/");
    button13.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button13_actionPerformed(e);
      }
    });
    button14.setBounds(new Rectangle(160, 170, 40, 20));
    button14.setLabel("*");
    button14.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button14_actionPerformed(e);
      }
    });
    button15.setBounds(new Rectangle(160, 200, 40, 20));
    button15.setLabel("+");
    button15.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button15_actionPerformed(e);
      }
    });
    button16.setBounds(new Rectangle(160, 230, 40, 20));
    button16.setLabel("-");
    button16.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button16_actionPerformed(e);
      }
    });
    button17.setBounds(new Rectangle(210, 140, 40, 20));
    button17.setLabel("(");
    button17.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button17_actionPerformed(e);
      }
    });
    button18.setBounds(new Rectangle(210, 170, 40, 20));
    button18.setLabel(")");
    button18.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button18_actionPerformed(e);
      }
    });
    button19.setBounds(new Rectangle(210, 200, 40, 20));
    button19.setLabel("^");
    button19.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button19_actionPerformed(e);
      }
    });
    button20.setBounds(new Rectangle(210, 230, 40, 20));
    button20.setLabel("AC");
    button20.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button20_actionPerformed(e);
      }
    });
    button21.setBounds(new Rectangle(10, 110, 115, 20));
    button21.setLabel("BackSpace");
    button21.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button21_actionPerformed(e);
      }
    });
    button22.setBounds(new Rectangle(135, 110, 115, 20));
    button22.setLabel("Produce");
    button22.addActionListener(new java.awt.event.ActionListener()
    {
      public void actionPerformed(ActionEvent e)
      {
        button22_actionPerformed(e);
      }
    });
    panel1.setLayout(null);
    this.setBackground(new Color(192, 216, 209));
    this.setSize(new Dimension(360, 300));
    this.setLayout(null);
    this.add(button1, null);
    this.add(button2, null);
    this.add(button3, null);
    this.add(button4, null);
    this.add(button5, null);
    this.add(button6, null);
    this.add(button7, null);
    this.add(button8, null);
    this.add(button9, null);
    this.add(button10, null);
    this.add(panel1, null);
    panel1.add(label1, null);
    panel1.add(label2, null);
    this.add(button11, null);
    this.add(button12, null);
    this.add(button13, null);
    this.add(button14, null);
    this.add(button15, null);
    this.add(button16, null);
    this.add(button17, null);
    this.add(button18, null);
    this.add(button19, null);
    this.add(button20, null);
    this.add(button21, null);
    this.add(button22, null);
  }

void button10_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"0");
    label2.setText("");
  }

void button1_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"1");
    label2.setText("");
  }

void button2_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"2");
    label2.setText("");
  }

void button3_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"3");
    label2.setText("");
  }

void button4_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"4");
    label2.setText("");
  }

void button5_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"5");
    label2.setText("");
  }

void button6_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"6");
    label2.setText("");
  }

void button7_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"7");
    label2.setText("");
  }

void button8_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"8");
    label2.setText("");
  }

void button9_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"9");
    label2.setText("");
  }

void button11_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+".");
    label2.setText("");
  }

void button12_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"X");
    label2.setText("");
  }

void button16_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"-");
    label2.setText("");
  }

void button15_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"+");
    label2.setText("");
  }

void button14_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"*");
    label2.setText("");
  }

void button13_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"/");
    label2.setText("");
  }

void button19_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"^");
    label2.setText("");
  }

void button18_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+")");
    label2.setText("");
  }

void button17_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()<45)
      label1.setText(label1.getText()+"(");
    label2.setText("");
  }

void button20_actionPerformed(ActionEvent e)
  {
    label1.setText("");
    label2.setText("");
  }

void button21_actionPerformed(ActionEvent e)
  {
    if(label1.getText().length()>0)
      label1.setText(label1.getText().substring(0,label1.getText().length()-1));
    label2.setText("");
  }

void button22_actionPerformed(ActionEvent e)
  {
    String ms = "+-*/^()",str;
    int open,i;
    k = 0;
    str = label1.getText();
    if((str.length() == 0)||(str.charAt(0)=='+'))
      {
        label2.setText("ERROR");
        return;
      }
    if(str.length() > 1)
      if(((str.charAt(0) == 'X')&&(ms.indexOf(str.charAt(1))==-1))||
         ((str.charAt(str.length()-1) == 'X')&&
         (ms.indexOf(str.charAt(str.length()- 2))==-1)))
      {
        label2.setText("ERROR");
        return;
      }
    for(i=1;i < str.length()-1; i++)
      {
        if(str.charAt(i) == 'X')
          if((ms.indexOf(str.charAt(i-1))==-1)||
             (ms.indexOf(str.charAt(i-1))==-1))
            {
              label2.setText("ERROR");
              return;
            }
        if((str.charAt(i)=='+')&&
           ((str.charAt(i-1)=='(')||(str.charAt(i+1)==')')))
          {
            label2.setText("ERROR");
            return;
          }

}
    open = 0;
    for(i=0;i < str.length(); i++)
      {
        if(str.charAt(i)=='(')
          open++;
        else
          if(str.charAt(i)==')')
            open--;
      }
    if(open!=0)
      {
        label2.setText("ERROR");
        return;
      }

str = Produce(str);
    if(str == "")
      str = "0";
    label2.setText(str);
  }

//---------------------------------------------------------------------------
  String need_brackets(String str)
    {
      int i,open;

if(str.length()==0)
        return "";
      open = 0;
      for(i=0;i<str.length();i++)
        if(str.charAt(i)=='(')
          open++;
        else
          if(str.charAt(i)==')')
            open--;
      if(open!=0)
        return "ERROR";
      open = 0;
      if((str.charAt(0)=='(')&&(str.charAt(str.length()-1)==')'))
        {
          for(i=1;i<str.length()-1;i++)
            {
              if((open==0)&&(str.charAt(i)==')'))
                {
                  i = str.length()-1;
                  open = 0xF0;
                }
              if(str.charAt(i)=='(')
                open++;
              else
                if(str.charAt(i)==')')
                  open--;
            }
          if(open==0)
            return str;
        }
      open = 0;
      for(i=0;i<str.length();i++)
        {
          if(str.charAt(i)=='(')
            open++;
          else
            if(str.charAt(i)==')')
              open--;
          if(((str.charAt(i)=='+')||(str.charAt(i)=='-'))&&(open==0))
            return "("+str+")";
        }
      if(open!=0)
        return "ERROR";
      else
        return str;
  }

//---------------------------------------------------------------------------
  String Produce(String str)
    {
      int i,j,k;
      int open=0;
      String s="",s1="",s2="";
      boolean p = true;
      if((str.charAt(0)=='(')&&(str.charAt(str.length()-1)==')'))
        {
          open = 0;
          for(i=1;i<str.length()-1;i++)
            if(str.charAt(i)=='(')
              open++;
            else
              if(str.charAt(i)==')')
                if(open==0)
                  {
                    i = str.length();
                    open = 1;
                  }
                else
                  open--;
          if(open==0)
            return need_brackets(Produce(str.substring(1,str.length()-1)));
        }
      k = 0;
      open = 0;
      if(str.charAt(0) == '-')
        str = "0" + str;
      for(i=0;i<str.length();i++)
        {
          if(str.charAt(i)=='(')
            open++;
          else
            if(str.charAt(i)==')')
              open--;
          if(open<0)
            return "ERROR";
          if((open==0)&&((str.charAt(i)=='+')||(str.charAt(i)=='-'))&&
             (str.charAt(i-1)!='^'))
            {
              if((s1=Produce(str.substring(k,i)))!="")
                if((k>0)&&(s.length()!=0))
                  s += str.substring(k-1,k);
                else
                  if(k>0)
                    if(str.charAt(k-1)=='-')
                      s += str.substring(k-1,k);

s += s1;
              k = i+1;
              p = false;
            }
        }
      if((k<str.length())&&!p)
        if((s1=Produce(str.substring(k)))!="")
          {
            if(((k>0)&&(s.length()!=0))||(str.charAt(k-1)=='-'))
              s += str.substring(k-1,k);
            s += s1;
          }
      if(p)
        {
          if((str.length()==1)&&(str.charAt(0)=='X'))
            return "1";
          open = 0;
          k = str.length();
          for(i=0;(i<str.length())&&((str.charAt(i)!='/')||(open!=0));i++)
            if(str.charAt(i)=='(') open++;
            else
              if(str.charAt(i)==')') open--;
                if(i < str.length())
                  if(str.charAt(i)=='/')
                    {
                      if((s1=Produce(str.substring(0,i)))!="")
                        {
                          if(s1!="1")
                            s += need_brackets(s1) + "*";
                          s += str.substring(i+1,str.length());
                        }
                      if((s1=Produce(str.substring(i+1,str.length())))!="")
                        {
                          if(s!="")
                            s += "-";
                          s += str.substring(0,i);
                          if(s1 != "1")
                            s += "*" + need_brackets(s1);
                        }
                      s = need_brackets(s);
                      if(s=="")
                        s = "0";
                      s += "/" + str.substring(i+1,str.length()) + "^2";
                      return s;
                    }
          open = 0;
          for(i=0;(i<str.length())&&((str.charAt(i)!='*')||(open!=0));i++)
            if(str.charAt(i)=='(') open++;
            else
              if(str.charAt(i)==')') open--;
                if(i < str.length())
                  if(str.charAt(i)=='*')
                    {
                      if((s1=Produce(str.substring(0,i)))!="")
                        {
                          if(s1!="1")
                            s += need_brackets(s1) + "*";
                          s += str.substring(i+1,str.length());
                        }
                      if((s1=Produce(str.substring(i+1,str.length())))!="")
                        {
                          if(s!="")
                            s += "+";
                          s += str.substring(0,i);
                          if(s1 != "1")
                            s += "*" + need_brackets(s1);
                        }
            return s;
          }
      open = 0;
      for(i=0;(i<str.length())&&((str.charAt(i)!='^')||(open!=0));i++)
        if(str.charAt(i)=='(') open++;
        else
          if(str.charAt(i)==')') open--;
      if(i < str.length())
      if(str.charAt(i)=='^')
        {
          if((s1=Produce(str.substring(0,i)))=="")
            return "";
          if(s1!="1")
            s += s1 + "*";
          s+=str.substring(i+1,str.length())+"*";
          Float v=new Float(-1);
          s2 = str.substring(i+1,str.length());
          v = Float.valueOf(s2);
          if(Float.valueOf(str.substring(i+1,str.length())).floatValue()-1==1)
            s += str.substring(0,i);
          else
            {
              s2 = str.substring(i+1,str.length());
              if(s2.indexOf('.')!=-1)
                if(Float.valueOf(s2.substring(s2.indexOf('.')+1,s2.length())).floatValue() == 0)
                  s2 = String.valueOf(Long.parseLong(s2)-1);
                else
                  s2 = String.valueOf(Float.valueOf(s2).floatValue()-1);
              else
                s2 = String.valueOf(Long.parseLong(s2)-1);
              s += str.substring(0,i+1)+s2; 
            }
          return s;
        }
      return "";
    }
  return s;
  }

}
//*************************************

Функция String Produce(String) - рекурсивно обрабатывает входную строку,
возвращает значение производной (в виде строки)
Функция String need_brackets(String) - проверяет, нужны ли входному выражению
скобки, если да, то возвращает выражение в скобках.