#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int TEMPERATURE_SENSOR_IN = A0;
float temperature_value = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2);

inline float get_C_temperature() {
  return analogRead(TEMPERATURE_SENSOR_IN) * (5.0 / 1023.0) * 100;
}

inline float C_to_F_temperature(float C_temperature) {
  return (C_temperature * 9.0 / 5.0) + 32.0;
}

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.print("T:");
  lcd.setCursor(10, 0);
  lcd.print("C");
  lcd.setCursor(10, 1);
  lcd.print("F");
}

void loop() {
  temperature_value = get_C_temperature();
  lcd.setCursor(3, 0);
  lcd.print(temperature_value);
  lcd.setCursor(3, 1);
  lcd.print(C_to_F_temperature(temperature_value));
  delay(100);
}