Java card coding error...

Question

Hi friends,
short[] temp = JCSystem.makeTransientShortArray((short)3,JCSystem.CLEAR_ON_DESELECT);
     public void add(APDU apdu) {
          byte[] buf = apdu.getBuffer();
          short p1 = buf[ISO7816.OFFSET_P1];
          short p2 = buf[ISO7816.OFFSET_P2];
          if (p2 == (short)2 && (p1 == (short)2)) {
               temp[0] = Util.getShort(buf,(short)5);
               temp[1] = Util.getShort(buf,(short)7);
          }else if (p2 == (short)2 && (p1 == (short)1)){
               temp[0] = Util.makeShort((byte)0,buf[5]);
               temp[1] = Util.getShort(buf,(short)6);
          }else {
               temp[0] = Util.makeShort((byte)0,buf[5]);
               temp[1] = Util.makeShort((byte)0,buf[6]);
          temp[2] = (short) ((temp[0] + temp[1]) & (short) 0xFFFF);
          if (temp[2] == (short)0xFFFF ) {
               ISOException.throwIt(ISO7816.SW_INCORRECT_P1P2);
          Util.setShort(buf,(short)0,temp[2]);
          apdu.setOutgoingAndSend((short) 0, (short) 2);
     }this is my add function code. if i want to access, have to call 80200101020202..here i given first short value 02, second 02, so i should get 04.
if i call like this, i can get wrong answer. can u tell me whats the wrong in this.
apdu output as,
cm>  /send 80200101020202
=> 80 20 01 01 02 02 02                               . .....
(149787 usec)
<= 00 C4 90 00                                        ....
Status: No Error

Answer 1

i changed above code like one byte addition. at the time also i m getting C4... may i know whats wrong...
byte[] temp = JCSystem.makeTransientByteArray((short)3,JCSystem.CLEAR_ON_DESELECT);
     public void add(APDU apdu) {
          byte[] buf = apdu.getBuffer();
          temp[0] = (byte) (buf[5] & 0xFF);
          temp[1] = (byte) (buf[6]& 0xFF);
          temp[2] = (byte) ((temp[0] + temp[1])& 0xFF);
          buf[0] = temp[2];
          apdu.setOutgoingAndSend((short) 0, (short) 1);
     }APDU output as...
cm>  /send 80200101020202
=> 80 20 01 01 02 02 02                               . .....
(136592 usec)
<= C4 90 00                                           ...
Status: No Error