computer.txt

很不错的一个小软件

                     }
                     substitution = true;
                 }
                                // multiplacation
                 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);    
     }
 }