mycalc.java

It is the application for stimulating the calculate different numbers

            convertNumsToDouble() ;
            answer = Math.pow( dNum1 , dNum2 ) ;
            setResults() ;
            MyPrint( "1c- powerOp: The value of answer is " + answer +
                " The value of opCode is " +  opCode );
         }
      }
      else {
         if ( checkFirstNum() ) {
            MyPrint( "1d- powerOp: The value of answer is " + answer +
                " The value of opCode is " +  opCode );
            pendingOpCode = 4 ;
         }
      }
      opCode = 4 ;
   } /** ********** End of powerOp() **************/

/**
 * divOp()
 *  Version 1.1
 * Changed 9/10/2003 - Fixed chained operation errors
 */
   private void multOp() {

      if ( pendingOp ) {
            MyPrint( "1a- multOp(): opCode is " + opCode + " The value of firstNum is " + firstNum );
            opCodeMethod() ;
            opCode = -1 ;
      }

      if ( !firstNumSet )  {
         pendingOp = true ;

         if ( opCode == 99 ) {
            firstNum = "" + answer ;
            firstNumSet = true ;
            MyPrint( "1b- multOp(): opCode is " + opCode + " The value of firstNum is " + firstNum );
         }

         if ( checkFirstNum() ) {
            opCode = 0 ;
            MyPrint( "1c- multOp(): opCode is " + opCode + " The value of firstNum is " + firstNum );
            pendingOpCode = 0 ;
         }
      }
      else if ( opCode == 0 ) {
         pendingOp = false ;
         secondNum = enterBox.getText()  ;
         pendingOp = true ;
         MyPrint( "2a- multOp(): opCode is " + opCode + " The value of secondNum is " + secondNum );
         if ( secondNum.equals( "" ) ) {
            secondNum = "1.0" ;
            MyPrint( "2b- multOp(): opCode is " + opCode + " The value of secondNum is " + secondNum );
         }
         MyPrint( "3a- multOp(): opCode is " + opCode + " secondNum is " + secondNum ) ;
         convertNumsToDouble() ;
         answer = dNum1 * dNum2 ;
         setResults() ;
         MyPrint( "3b- multOp(): opCode is " + opCode + " The value of answer is " + answer );
         dNum1 = answer ;
         secondNum = "0.0"  ;
         secondNumSet = true ;
      }
      else {
         pendingOp = true ;
         pendingOpCode = 0 ;
         opCode = 0 ;
         result = true ;
         MyPrint( "3a- multOp(): opCode is " + opCode + " The value of answer is " + answer );
      }
   } /** ********** End of multOp() **************/

/** /**
 * divOp() - divides the two entered numbers and checks for a zero divisor
 * Version 1.1
 * Changed 9/10/2003 - Fixed chained operation errors
 */
   private void divOp() {
      MyPrint( "1a- divOp(): opCode is " + opCode + " firstNumSet =s " + firstNumSet  );
      if ( pendingOp ) {
         MyPrint( "1aa- divOp(): opCode is " + opCode  );
         opCodeMethod() ;
         opCode = -1 ;
      }

      if ( !firstNumSet )  {
         pendingOp = true ;

         if ( opCode == 99 ) {
            firstNum = "" + answer ;
            firstNumSet = true ;
            MyPrint( "1b- divOp(): opCode is " + opCode + " The value of firstNum is " + firstNum );
         }

         if ( checkFirstNum() ) {
            MyPrint( "1c- divOp(): opCode is " + opCode + " The value of firstNum is " + firstNum );
            pendingOpCode = 1 ;
            opCode = 1 ;
         }
      }
      else if ( firstNumSet ) {
         if ( pendingOp ) {
            opCodeMethod() ;
            opCode = 1 ;
         }

         secondNum = enterBox.getText() ;
         MyPrint( "2a- divOp(): opCode is " + opCode + " firstNum is " +
               firstNum + " secondNum is " + secondNum ) ;
         if ( secondNum.equals( "" ) || opCode < 0 ) {
            MyPrint( "2b- divOp(): opCode is " + opCode + " firstNum is " +
               firstNum + " secondNum is " + secondNum ) ;
         }
         else {
            convertNumsToDouble() ;
            if (dNum2 != 0.0 ) {
               answer = dNum1 / dNum2 ;
               setResults() ;
               MyPrint( "2- divOp(): opCode is " + opCode + " firstNum is " +
                  firstNum + " secondNum is " + secondNum ) ;
            }
            else {
               JOptionPane.showMessageDialog( this, "The number " +
                    dNum2 + " cannot be used as a denometer" ,
                    "Attempted to Divide by Zero",
                    JOptionPane.ERROR_MESSAGE );
               firstNumSet = false ;
               firstNum = ""  ;
              opCode = -1 ;
            }
         }
         opCode = 1 ;

      }
      //enterBox.setText( "" )  ;
      result = true ;
   } /** ********** End of divOp() **************/

/** subOp() - subtracts the second number from the first number
 *
 * Version 1.1
 * Changed 9/10/2003 - Fixed chained operation errors
 *    */
   private void subOp() {

      if ( pendingOp ) {
         MyPrint( "subOp() 1a: In pendingOp code. The opcode value is " + opCode ) ;
         opCodeMethod() ;
         opCode = 2 ;
         pendingOp = true ;
         pendingOpCode = 2 ;
      }
      else if( !firstNumSet ) {
         firstNum = enterBox.getText()  ;
         pendingOp = true ;
         pendingOpCode = 2 ;
         opCode = 2 ;
         firstNumSet = true ;
         result = true ;
         MyPrint( "1b- subOp()-checkFirstNum(): opCode is " + opCode + " The value of answer is " + answer );
      }
      else if ( opCode == 2 ) {
         pendingOp = false ;

         if ( secondNum.equals( "0.0" ) ) {
            firstNum = "" + answer ;
         }

         secondNum = enterBox.getText()  ;
         if ( secondNum.equals( "" ) ) {
            secondNum = "0.0" ;
         }
         MyPrint( "2a- subOp(): opCode is " + opCode + " secondNum is " + secondNum ) ;
         convertNumsToDouble() ;
         answer = dNum1 - dNum2 ;
         setResults() ;
         MyPrint( "2b- subOp(): opCode is " + opCode + " The value of answer is " + answer );
         secondNum = "0.0"  ;
         opCode = -1 ;
         secondNumSet = true ;
      }
      else {
         pendingOp = true ;
         pendingOpCode = 2 ;
         opCode = 2 ;
         result = true ;
         MyPrint( "3a- subOp(): opCode is " + opCode + " The value of answer is " + answer );
      }
   } /** ********** End of subOp() **************/

/**
 * plusOp() - adds the two entered numbers
 * Version 1.1
 * Changed 9/10/2003 - Fixed chained operation errors
 */
   private void plusOp() {

      if ( pendingOp ) {
         MyPrint( "subOp() 1a: In pendingOp code. The opcode value is " + opCode ) ;
         opCodeMethod() ;
         opCode = 3 ;
         pendingOp = true ;
         pendingOpCode = 3 ;
      }
      else if( !firstNumSet ) {
         firstNum = enterBox.getText()  ;
         pendingOp = true ;
         pendingOpCode = 3 ;
         opCode = 3 ;
         firstNumSet = true ;
         result = true ;
         MyPrint( "1b- plusOp()-checkFirstNum(): opCode is " + opCode + " The value of answer is " + answer );
      }
      else if ( opCode == 3 ) {
         pendingOp = false ;
         MyPrint( "2aa- plusOp(): opCode is " + opCode + " secondNum is " + secondNum ) ;
         if ( secondNum.equals( "0.0" ) ) {
            firstNum = "" + answer ;
         }

         secondNum = enterBox.getText()  ;
         if ( secondNum.equals( "" ) ) {
            secondNum = "0.0" ;
         }
         MyPrint( "2a- plusOp(): opCode is " + opCode + " secondNum is " + secondNum ) ;
         convertNumsToDouble() ;
         answer = dNum1 + dNum2 ;
         setResults() ;
         MyPrint( "2b- plusOp(): opCode is " + opCode + " The value of answer is " + answer );
         secondNum = "0.0"  ;
         opCode = -1 ;
         secondNumSet = true ;
      }
      else {
         pendingOp = true ;
         pendingOpCode = 3 ;
         opCode = 3 ;
         result = true ;
         MyPrint( "3a- plusOp(): opCode is " + opCode + " The value of answer is " + answer );
      }
   } /** ********** End of plusOp() **************/

/** convertNumsToDouble() - converts numbers entered from string to double  */
   private void convertNumsToDouble() {
      if ( !firstNum.equals( "" ) )
         dNum1 = Double.parseDouble( firstNum ) ;
      if ( !secondNum.equals( "" ) )
         dNum2 = Double.parseDouble( secondNum ) ;
      MyPrint( "convertNumsToDouble(): The value of dNum1 is " + dNum1 );
      MyPrint( "convertNumsToDouble(): The value of dNum2 is " + dNum2 );

   } /** ********** End of convertNumsToDouble() **************/

/**  PlusMinus() - toggles the sign of the entered number */
   private void PlusMinus() {
      MyPrint( "PlusMinus: The value of enterBox is " + enterBox.getText() );

      if ( !enterBox.getText().equals( "" ) ) {
         answer = Double.parseDouble( enterBox.getText() ) * minusOne ;
         MyPrint( "1a- PlusMinus: The value of answer is " + answer );
         setResults() ;
      }
      else if ( !firstNum.equals( "" ) ) {
         answer = Double.parseDouble( firstNum ) * minusOne ;
         setResults() ;
         MyPrint( "1b- PlusMinus: The value of firstNum is " + firstNum );
      }
      result = true ;

   } /** ********** End of PlusMinus() **************/

/**  MySqrt() - computes the square root of the entered number */
   private void MySqrt() {
      MyPrint( "1a- MySqrt(): opCode is " + opCode + " firstNum is " + firstNum ) ;
      if ( opCode == 99 ) {
         answer = Math.sqrt( answer ) ;
         setResults() ;
      }
      else if ( !enterBox.getText().equals( "" ) ) {
         MyPrint( "1b- MySqrt(): opCode is " + opCode + " firstNum is " + firstNum ) ;
         if ( pendingOp )
            opCodeMethod() ;
         answer = Double.parseDouble( enterBox.getText() ) ;
         answer = Math.sqrt( answer ) ;
         setResults() ;
      }
      else if ( !firstNum.equals( "" ) ) {
         MyPrint( "1c- MySqrt(): opCode is " + opCode + " firstNum is " + firstNum ) ;
         answer = Double.parseDouble( firstNum ) ;
         answer = Math.sqrt( answer ) ;
         setResults() ;
      }
      //opCode = -1 ;

   } /** ********** End of MySqrt() **************/

/**  OneDivX() - computes the value of one divided by the entered number             */
   private void OneDivX() {
      MyPrint( "1a- OneDivX(): opCode is " + opCode + " firstNum is " + firstNum ) ;
      if ( opCode == 99 ) {
         answer = ( 1.0 / answer ) ;
         setResults() ;
      }
      else if ( !enterBox.getText().equals( "" ) ) {
         answer = Double.parseDouble( enterBox.getText() ) ;
         answer = ( 1.0 / answer ) ;
         setResults() ;
      }
      else if ( firstNumSet ) {
         answer = Double.parseDouble( firstNum ) ;
         answer = ( 1.0 / answer ) ;
         setResults() ;
      }
   }
/** ********** End of OneDivX() **************/

/**  sysExit() - causes the application to exit */
   private void sysExit()   {
      System.exit( 0 );

   } /** ********** End of sysExit() **************/

/**  MyPrint() - toggles debug aid on or off*/
   private void MyPrint( String str )   {
      if ( myDiag )
         System.out.println( str );

   } /** ********** End of MyPrint() **************/

/**  main() */
   public static void main( String args[] ) {

      final MyCalc app = new MyCalc () ; /** creates an instance of MyCalc  */

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               app.sysExit()  ;
            }
         }
      );
   }
/** ********** End of main() **************/
}