Arduino program to interface the sensor and led

int sensorvalue=0;
void setup()
{
  pinMode(A0,INPUT);
  pinMode(13, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  sensorvalue=analogRead(A0);
  Serial.println(sensorvalue);
  if(sensorvalue>=30)
  {    
  digitalWrite(13,HIGH);
  } 
  else
  {
  digitalWrite(13,LOW);
  }  
}