How to programme the LM35 Sensor

How to programme the LM35 Sensor

float final_temp;
int raw_temp,led=13;
int sensor_pin=A0;
void setup()
{
pinMode(A0,INPUT);
pinMode(led,OUTPUT);
analogReference(INTERNAL);
Serial.begin(9600);
}

void loop()
{
raw_temp = analogRead(sensor_pin);
final_temp = raw_temp/ 9.31;

if(final_temp >=26)
{
digitalWrite(led,HIGH);
}
else
{
digitalWrite(led,LOW);
}
Serial.println(final_temp);
delay(1000);
}