Temperature Sensor

1.
void setup() {
 Serial.begin(9600);
 pinMode(13, OUTPUT);
}

void loop() {
  float degreesC = ((analogRead(0) * 0.004882814)- 0.5)*100.0;
  float degreesF = (9.0)/(5.0)*degreesC+32.0;
  if(degreesF<74){
    noTone(8);
    Serial.println("Temperature is fine Jesse!");
    digitalWrite(13, HIGH);
    delay(500);
    digitalWrite(13, LOW);
    delay(500);
  }
  else{
    tone(8, 220);
    Serial.println("HOT! HOT! HOT!");
    digitalWrite(13, HIGH);
    delay(50);
    digitalWrite(13, LOW);
    delay(50);
  }
}

2.
void setup() {
 Serial.begin(9600);
 pinMode(13, OUTPUT);
}

void loop() {
  float degreesC = ((analogRead(0) * 0.004882814)- 0.5)*100.0;
  float degreesF = (9.0)/(5.0)*degreesC+32.0;
  int threshold = map(analogRead(2), 0, 1023, 72, 80);
  threshold = constrain(threshold, 72, 80);
  if(degreesF<threshold){
    noTone(8);
    Serial.println("Temperature is fine Jesse!");
    digitalWrite(13, HIGH);
    delay(500);
    digitalWrite(13, LOW);
    delay(500);
  }
  else{
    tone(8, 220);
    Serial.println("HOT! HOT! HOT!");
    digitalWrite(13, HIGH);
    delay(50);
    digitalWrite(13, LOW);
    delay(50);
  }
}