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// Theodora Tataru C00231174
// Ana Griga C00231441
// Year 2
// Calculator Project
package Calculator;
import java.util.EmptyStackException;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
// THIS CLASS IS DEDICATED FOR BUTTON'S FUNCTIONS
public class ButtonFunction
{
// CLEAR BUTTON
public static void clear()
{
// reset the arrays : infix and postfix arrays
for(int i = 0; i < Calculator.postfixArray.length; i++)
Calculator.postfixArray[i] = null;
for(int j = 0; j < Calculator.infixArray.length; j++)
Calculator.infixArray[j]=null;
// reset the textfield and all the elements
// the user can start from zero with no errors
Calculator.textField.setText("");
Calculator.elements = "";
Calculator.buttonLabel = "";
Calculator.infixArrayCount = 0;
Calculator.postfixArrayCount = 0;
}// end CLEAR
// BACKSPACE BUTTON
public static void backspace()
{
try // if there are characters to be deleted it will delete the last one
{
// erasing the last character from the textfield
// and not displaying the backspace symbol
String theText = Calculator.textField.getText();
Calculator.textField.setText(theText.substring(0, theText.length()-2));
// erasing the last character from the infix array
Calculator.infixArray[Calculator.infixArrayCount] =
Calculator.infixArray[Calculator.infixArrayCount].substring(0, Calculator.infixArray[Calculator.infixArrayCount].length()-1);
// replacing the string in elements with the last character deleted
Calculator.elements = Calculator.infixArray[Calculator.infixArrayCount];
}
// if there are no more characters to be deleted and we get
// StringIndexOutOfBoundsException error, the calculator will move to previous index of the infixArray
catch(StringIndexOutOfBoundsException errorString )
{
try
{ // moving to the previous index of the infix array
Calculator.infixArrayCount--;
// erasing the last character from the infix array
Calculator.infixArray[Calculator.infixArrayCount] =
Calculator.infixArray[Calculator.infixArrayCount].substring(0, Calculator.infixArray[Calculator.infixArrayCount].length()-1);
// replacing the string in elements with the last character deleted
Calculator.elements = Calculator.infixArray[Calculator.infixArrayCount];
}
// if the index 0 of the array has no more characters to be deleted, reset the calculator
catch(ArrayIndexOutOfBoundsException errorArray)
{
clear();
}
}
// if we need to delete an arithmetic sign
catch(NullPointerException signError)
{ // moving to the previous index of the infix array
Calculator.infixArrayCount--;
// erasing the last character from the infix array
Calculator.infixArray[Calculator.infixArrayCount] =
Calculator.infixArray[Calculator.infixArrayCount].substring(0, Calculator.infixArray[Calculator.infixArrayCount].length()-1);
}
} // end BACKSPACE
// NUMBER BUTTON + DECIMAL POINT
public static void operandButton()
{
Calculator.elements += Calculator.buttonLabel;
Calculator.infixArray[Calculator.infixArrayCount] = Calculator.elements;
// the pressed DIGIT is added at the end (append) to the ELEMENTS string
// the new String is added into an array
// we do not increase the infixArrayCount, as on this position we might append another digit
}// end OPERAND BUTTON
// NEGATIVE button
public static void negativeSign()
{
if(Calculator.elements.equals("")) // if the ELEMENTS is empty because the NEGATIVE
{ // sign can be added just at the beginning of a number
Calculator.elements += "-";
Calculator.infixArray[Calculator.infixArrayCount] = Calculator.elements;
}
else // if the NEGATIVE sign is added in the middle of the number, ERROR
{
// alert, because we cannot use the negative sign as a minus!
JOptionPane.showMessageDialog(new JFrame(), "You can not use the NEGATIVE sign for substraction!", "Calculation Error", JOptionPane.ERROR_MESSAGE);
// clear the text field if the error pops up
clear();
}
}// end NEGATIVE SIGN
// OPERATORS BUTTONS
public static void operatorButton()
{
Calculator.infixArrayCount++; // Until an OPERATOR is pressed, the number(s) string is added
// to the previous index.
Calculator.infixArray[Calculator.infixArrayCount] = Calculator.buttonLabel;
// we add at that index the pressed OPERAND
Calculator.elements = "";
// we clear the elements, to add new number or the new operand and not be mixed
// with previous digits or operands
Calculator.infixArrayCount++; // we increase the position of the next available index
}// end OPERATORS BUTTONS METHOD
// THE MEMORY STORE
public static void memoryStore()
{ // Deleting from the TEXTFIELD the label of the button MS
String theText = Calculator.textField.getText();
Calculator.textField.setText(theText.substring(0, theText.length() - 2));
//System.out.println(theText.substring(0, theText.length() - 2));// test only - CONSOLE READING
if(Calculator.infixArrayCount==0 && Calculator.MS.length()==0 && Calculator.infixArray[Calculator.infixArrayCount]!=null)
{ // if the number is valid to be added into the memory (not followed by an operand or a null index)
// if there is no element saved into MS, the element can be saved into it
Calculator.MS = Calculator.infixArray[Calculator.infixArrayCount];
// add the operation into history text area
System.out.println("The " + Calculator.MS + " was added into memory!"); // test - CONSOLE READING|
Calculator.history.setText(Calculator.MS + " was added into memory!" + "\n\n"+ Calculator.history.getText());
}
else if(Calculator.infixArrayCount==0 && Calculator.MS.length()>0)
{ // if there is already an element saved into MEMORY, give the user an error
JOptionPane.showMessageDialog(new JFrame(), "Clear the memory first!", "Error", JOptionPane.ERROR_MESSAGE);
// display error in history
Calculator.history.setText(Calculator.MS + " is already in the memory!" + "\n\n"+ Calculator.history.getText());
}
else
{ // if the element is not valid for the memory (if it's not a number)
JOptionPane.showMessageDialog(new JFrame(), "Please insert a valid number!", "Error", JOptionPane.ERROR_MESSAGE);
// display error in history
Calculator.history.setText(Calculator.textField.getText() + " is not a valid number to be added in memory!" + "\n\n"+ Calculator.history.getText());
}
}// end MEMORY STORE
// MEMORY CLEAR BUTTON
public static void memoryClear()
{
// do not allow the label of the button to be printed to the text field
String theText = Calculator.textField.getText();
Calculator.textField.setText(theText.substring(0, theText.length() - 2));
// if the memory is used
if(Calculator.MS.length()>0)
{ // if there is an element saved into MS, delete it, and print the message on history panel
Calculator.history.setText(Calculator.MS + " was deleted from the memory!" + "\n\n"+ Calculator.history.getText());
// clear the MS
Calculator.MS = "";
}
else if(Calculator.MS.length()==0)
{ // if there is no element saved into MS, print it to the history
Calculator.history.setText(Calculator.MS + "The memory is clear! " + "\n\n"+ Calculator.history.getText());
// clear the text field when the error pops up
clear();
} // end MEMORY CLEAR
}
// MEMORY RECALL BUTTON
public static void memoryRecall()
{
// theText takes the string from the textfield
String theText = Calculator.textField.getText();
// if the memory is empty, display the message to the history area
if(Calculator.MS.equals(""))
{
// do not display the button label to the text field
Calculator.textField.setText(theText.substring(0, theText.length() - 2));
// message in history area
Calculator.history.setText(Calculator.MS + "The memory is clear! " + "\n\n"+ Calculator.history.getText());
}
else // if there is a value stored in MS
{
// do not allow the label of the button to be printed to the text field
Calculator.textField.setText(theText.substring(0, theText.length() - 2));
// add the number from MS to the infixArray
Calculator.infixArray[Calculator.infixArrayCount] = Calculator.MS;
// add the number from MS to the text field
Calculator.textField.setText(Calculator.textField.getText() + Calculator.MS);
}
} // end MEMORY RECALL
// EQUAL BUTTON
public static void equal()
{
if(Calculator.infixArray[0]==null)
{ // if the user inserts a digit, will overwrite the 0
Calculator.infixArray[0]="0";
// if the user inserts an operator, according to the operatorButton() method
// the operator will be placed on the next index, leaving the 0 on the
// previous index.
Calculator.textField.setText("0" + Calculator.textField.getText());
}
// getting the postfixArray
Calculator.postfixArrayCount = ArithmeticOperations.postfixStack(Calculator.postfixArray, Calculator.infixArray, Calculator.infixArrayCount);
try
{ // TOTAL is the result of the calculation
String total = ArithmeticOperations.result(Calculator.postfixArray, Calculator.postfixArrayCount);
// checking if the numbers is a DOUBLE
if(ArithmeticOperations.theNumberIsADouble(total))
{ // if the TOTAL has the decimal digits > then 0, we display the TOTAL with the decimal points.
// adding the whole calculation to the HISTORY TEXT AREA
Calculator.history.setText(Calculator.textField.getText() + total + "\n\n"+ Calculator.history.getText());
System.out.println("DECIMAL POINT " + total); // TEST - CONSOLE READING
// display the result on the text field
Calculator.textField.setText(total);
// reset infix array -> ready for next calculation
Calculator.infixArrayCount = 0;
// the result will be ready to be used in another calculation on [0]
Calculator.infixArray[Calculator.infixArrayCount] = total;
// the division by 0
try { // if the result is INFINITY or NAN, handle the division by 0 in the exception class
if(Double.parseDouble(Calculator.infixArray[0])==Double.POSITIVE_INFINITY || Double.parseDouble(Calculator.infixArray[0])==Double.NEGATIVE_INFINITY
||Double.isNaN(Double.parseDouble(Calculator.infixArray[0])) )
throw new CalculatorExceptions();
}
catch(CalculatorExceptions InfinityResult)
{
System.out.println("Division by 0, handeled"); // TEST - CONSOLE READING
}
}
// BIG DECIMAL
else if(ArithmeticOperations.isBigDecimal(total))// adding the whole calculation to the HISTORY TEXT AREA
{ // if the TOTAL is very big and is written in scientific notation, display to the screen as a bigDecimal
Calculator.history.setText(Calculator.textField.getText() + total + "\n\n"+ Calculator.history.getText());
System.out.println("DECIMAL POINT " + total); // TEST - CONSOLE READING
Calculator.textField.setText(total);
Calculator.infixArrayCount = 0;
Calculator.infixArray[Calculator.infixArrayCount] = total;
}
// INTEGER
else
{ // if the TOTAL has a decimal point, and the decimals are all 0s, we display it as a whole number
// getting the number before the decimal point
total = total.substring(0, total.indexOf('.'));
Calculator.history.setText(Calculator.textField.getText() + total + "\n\n"+ Calculator.history.getText());
System.out.println("NO DECIMAL POINT " + total); // TEST - CONSOLE READING
Calculator.textField.setText(total);
Calculator.infixArrayCount = 0;
Calculator.infixArray[Calculator.infixArrayCount] = total;
}
}
// INVALID INPUT
catch(EmptyStackException tooManySymbols)
{ // the postfixt method can not handle the input
Calculator.history.setText(Calculator.textField.getText() + "Invalid Input" + "\n\n"+ Calculator.history.getText());
Calculator.textField.setText("Invalid input");
JOptionPane.showMessageDialog(new JFrame(), "Invalid input!", "Error", JOptionPane.ERROR_MESSAGE);
// clear the text field if the error pops up
ButtonFunction.clear();
}
// pressing equal with no operands or operators inserted
catch(StringIndexOutOfBoundsException pressingEqualWithNoOP)
{
Calculator.history.setText(Calculator.textField.getText() + "No Operators/Operands found!" + "\n\n"+ Calculator.history.getText());
Calculator.textField.setText("Invalid input");
JOptionPane.showMessageDialog(new JFrame(), "Invalid input!", "Error", JOptionPane.ERROR_MESSAGE);
// clear the text field if the error pops up
ButtonFunction.clear();
}
}
// MULTIPLE DECIMAL POINTS
public static void checkDecimalPoint()
{
if(Calculator.infixArray[Calculator.infixArrayCount]!=null) // if the DECIMAL POINT IS NOT THE FIRST CHARACTER
{
if(Calculator.infixArray[Calculator.infixArrayCount].contains("."))
{ // if there is already a decimal point in the number, ignore it
String theText = Calculator.textField.getText();
Calculator.textField.setText(theText.substring(0, theText.length()-1));
System.out.println("Decimal point ignored"); // TEST - CONSOLE READING
}
else // if there is no decimal point in the number, add it to the number
operandButton();
}
else // if the DECIMAL point starts the number, we ignore it
{
String theText = Calculator.textField.getText();
Calculator.textField.setText(theText.substring(0, theText.length()-1));
System.out.println("Decimal point ignored"); // TEST - CONSOLE READING
}
}
}