#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27 , 16 , 2);
void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  Serial.println("Please enter a number:");
  while (!Serial.available());
  int num1 = Serial.readString().toInt();
  Serial.println(num1);
  Serial.println("Please enter a number:");
  while (!Serial.available());
  int num2 = Serial.readString().toInt();
  Serial.println(num2);
  Serial.println("Please enter the function:");
  while (!Serial.available());
  float function = Serial.readString().toInt();
  if function = ("+"):
    int result = num1 + num2;
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Sum of numbers = ");
  lcd.setCursor(0,1);
  lcd.print(result);
}

void loop() {
}