IR sensor program

Anyone can suggest what command can i use if my reading from a sensor (assuming IR distance sensor includes cable (20cm-150cm) [GP2Y0A02YK] : ID 1031 : Adafruit Industries, Unique & fun DIY electronics and kits) produces a certain voltage, then it would convert it into a 1 count?

If your sensor is connected to analog pin 2,

   it = 0;
   int distVal = analogRead(2);
   if(distVal > aCertainVoltage)
   {
      it = 1;
   }