calculator.java

俄罗斯方块

          else if(operatedCommand.equals('\u00d7'))
          {
              head = head*tail;
              result.setText(Double.toString(head));
              substitution = true;
          }
                    // sub
          else if(operatedCommand.equals('-'))
          {
              head = head-tail;
              result.setText(Double.toString(head));
              substitution = true;
          }
                    // plus
          else if(operatedCommand.equals('+'))
          {
              head = head+tail;
              result.setText(Double.toString(head));
              substitution = true;
          }
                    // pow
          else if(operatedCommand.equals('pow'))
          {
            head = Math.pow(head, tail);
            result.setText(Double.toString(head));
              substitution = true;
          }
                    // the Yth root of the X
          else if(operatedCommand.equals('XeY'))
          {
            head = Math.pow(head, 1/tail);
            result.setText(Double.toString(head));
              substitution = true;   
          }
                    // modular
          else if(operatedCommand.equals('Mod'))
          {
            head = head % tail;
            result.setText(Double.toString(head));
              substitution = true;
          }
        }
        preOperatedCommand = '=';
      }
    /*************************************************************
    *   set the action of the number
    **************************************************************/
    else if(actionCommand.equals('0'))
    {
        if(!(result.getText().equals('0') || result.getText().equals('-0')))
        {
          if(substitution)
          {
            result.setText('0');
          }
          else
            result.setText(result.getText() + '0');
        }
    }
    else if(actionCommand.equals('1'))
    {
        if(substitution)
        {
          result.setText('1');
          substitution = false;
        }
        else
          result.setText(result.getText() + '1');
    }
    else if(actionCommand.equals('2'))
    {
        if(substitution)
        {
          result.setText('2');
          substitution = false;
        }
        else
          result.setText(result.getText() + '2');
    }
    else if(actionCommand.equals('3'))
    {
        if(substitution)
        {
          result.setText('3');
          substitution = false;
        }
        else
          result.setText(result.getText() + '3');
    }
    else if(actionCommand.equals('4'))
    {
        if(substitution)
        {
          result.setText('4');
          substitution = false;
        }
        else
          result.setText(result.getText() + '4');
    }
    else if(actionCommand.equals('5'))
    {
        if(substitution)
        {
          result.setText('5');
          substitution = false;
        }
        else
          result.setText(result.getText() + '5');
    }
    else if(actionCommand.equals('6'))
    {
        if(substitution)
        {
          result.setText('6');
          substitution = false;
        }
        else
          result.setText(result.getText() + '6');
    }
    else if(actionCommand.equals('7'))
    {
        if(substitution)
        {
          result.setText('7');
          substitution = false;
        }
        else
          result.setText(result.getText() + '7');
    }
      else if(actionCommand.equals('8'))
      {
        if(substitution)
        {
          result.setText('8');
          substitution = false;
        }
        else
          result.setText(result.getText() + '8');
    }
      else if(actionCommand.equals('9'))
      {
        if(substitution)
        {
          result.setText('9');
          substitution = false;
        }
        else
          result.setText(result.getText() + '9');
    }
    else if(actionCommand.equals('.'))
    {
        if(result.getText().length() == 0)
          result.setText('0.');
          
        if(!(result.getText().contains('.')))
          result.setText(result.getText() + '.');
    }
    else if(actionCommand.equals('\u00b1'))
    {
        if(result.getText().charAt(0) != '-')
          result.setText('-' + result.getText());
        else
          result.setText(result.getText().substring(1));
    }
    else if(actionCommand.equals('C'))
    {
        result.setText('0');
        substitution = true;
    }
      
      /*************************************************************
    *   set the action of the arithmetic
    **************************************************************/
      // division
      else if(actionCommand.equals('\u00F7'))
      {
        head = Double.parseDouble(result.getText().trim());
        operatedCommand = '\u00F7';
        substitution = true;
        preOperatedCommand = '\u00F7';
      }
      // multiplication
      else if(actionCommand.equals('\u00d7'))
      {
        head = Double.parseDouble(result.getText().trim());
        operatedCommand = '\u00d7';
        substitution = true;
        preOperatedCommand = '\u00d7';
      }
          // sub
      else if(actionCommand.equals('-'))
      {
        head = Double.parseDouble(result.getText().trim());
        operatedCommand = '-';
        substitution = true;
        preOperatedCommand = '-';
      }
          // plus
      else if(actionCommand.equals('+'))
      {
        head = Double.parseDouble(result.getText().trim());
        operatedCommand = '+';
        substitution = true;
        preOperatedCommand = '+';
      }
          // backwards
      else if(actionCommand.equals('1/X'))
      {
        head = Double.parseDouble(result.getText().trim());
        if(head != 0)
          result.setText(Double.toString(1/head));   
        else
        {
          JOptionPane.showMessageDialog(this, 'Cannot divide by zero.');
          head = 0.0;
          tail = 0.0;
        }
      }
          // factorial
      else if(actionCommand.equals('X!'))
      {
        head = Double.parseDouble(result.getText().trim());
        result.setText(Double.toString(factorial(head)));   
      }
          // square
      else if(actionCommand.equals('sqr'))
      {
        head = Double.parseDouble(result.getText().trim());
        result.setText(Double.toString(head*head));   
      }
          // square root 
      else if(actionCommand.equals('\u221a'))
      {
        head = Double.parseDouble(result.getText().trim());
        if(head >= 0.0)
          result.setText(Double.toString(Math.sqrt(head)));   
        else
        {
          JOptionPane.showMessageDialog(this, 'Invalid input for function');
          head = 0.0;
          tail = 0.0;
        }   
      }
          // power
      else if(actionCommand.equals('pow'))
      {
        head = Double.parseDouble(result.getText().trim());
        operatedCommand = 'pow';
        substitution = true;
        preOperatedCommand = 'pow';
      }
          // the Yth of the X
      else if(actionCommand.equals('XeY'))
      {
        head = Double.parseDouble(result.getText().trim());
        operatedCommand = 'XeY';
        substitution = true;
        preOperatedCommand = 'XeY';   
      }
          // modular
      else if(actionCommand.equals('Mod'))
      {
        head = Double.parseDouble(result.getText().trim());
        operatedCommand = 'Mod';
        substitution = true;
        preOperatedCommand = 'Mod';   
      }
          // MS
      else if(actionCommand.equals('MS'))
      {
        variableMemory = Double.parseDouble(result.getText().trim());
      }
          // MR
      else if(actionCommand.equals('MR'))
      {
        result.setText(Double.toString(variableMemory));   
      }
          // MC
      else if(actionCommand.equals('MC'))
      {
        variableMemory = 0.0;   
      } 
      
  }
  /**
  * calculates and returns the factorial of the value
  *
  * @param value value of the root of the factorial
  *
  */
  public double factorial(double value)
  {
      if(value <= 1.0)
        return value;
      else
        return value*factorial(value-1);   
  } 
  /**
  * calculates and returns the check sum of the message.
  *
  * @param message message of the name whick entered by the user.
  */
  public long calChecksum(String message)
  {
      long check=0;
      
      for (int i=0;i<message.length();i++)
            check += message.charAt(i);   
      return check;   
  }
  
  public static void main(String[] args)
  {
      Calculator calculator = new Calculator();
      calculator.pack();
      calculator.setVisible(true);   
  }
}