Bluetooth signal returns 0 I have started programming Arduino in the last month. Now I'm working with a bluetooth module. But when I send some data from the Android device to the Arduino, it stays for a very short time and after that  immediately it becomes 0. 

Why does it become 0? And how can I get rid of that problem?

Here is my code:

int x,y;

void setup() 
{
  Serial.begin(9600);
}
void loop() 
{
  if(Serial.available()&gt;0)
  {
    x=Serial.parseInt();
    y=Serial.parseInt();
    Serial.print("x:");
    Serial.print(x);
    Serial.print("\n");
    Serial.print("y:");
    Serial.print(y);
    Serial.print("\n");
  }
  else
  {
    ;
  }
}


and here is the result:
Serial.parseInt() has a timeout. If something arrives on the serial, or is left over from a previous transmission and hasn't been read yet, Serial.parseInt() will start looking for a number to parse. When that fails it times out (and so does the second one immediately after it). When that timeout occurs parseInt() just returns 0.

IMHO the Arduino serial parsing routines are very poorly written and should be avoided. I have some tips on how to properly read serial here.