#include <LiquidCrystal.h>

const int rs =26, en=25, d4=13, d5=12, d6=14, d7=27;
LiquidCrystal lcd(rs,en,d4,d5,d6,d7); 
float firstNum;
float secNum;
float answer;
String op;

int dt = 3000;

void setup() 
{
  //SET THE lcd's  number o rows and coloum
  lcd.begin(16, 2); 
  lcd.clear();
  Serial.begin(115200);
}

void loop() {
  lcd.setCursor(0,0); 
  lcd.print("Enter 1st number :");
  Serial.println("Input 1st number:  ");
  while(Serial.available() == 0) 
  {

  }
  firstNum = Serial.parseFloat();
  lcd.clear();

  lcd.setCursor(0,1); 
  lcd.print("Enter 2nd number :");
  Serial.println("Input 2nd number:  ");
  while(Serial.available() == 0) 
  {
  
  }
  firstNum = Serial.parseFloat();
  lcd.clear();

  lcd.setCursor(0,0);
  lcd.print("Input(+,-,*,/)");
  Serial.println("Input(+,-,*,/)");
  while(Serial.available() == 0)
  {

  }
  op = Serial.readString();

  if(op == "+")
  {
    answer = firstNum + secNum;
  }
  else if(op == "-")
  {
    answer = firstNum - secNum;
  }
  else if(op == "*")
  {
    answer = firstNum * secNum;
  }
  else if(op == "/")
  {
    answer = firstNum/secNum;
  }
  else{
    lcd.print("Invaid");
    Serial.println("Invalid");
  }

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(firstNum);
  Serial.println(firstNum);
  lcd.print(op);
  Serial.println(op);
  lcd.print(secNum);
  Serial.println(secNum);
  lcd.print(op);
  Serial.println(op);
  lcd.print("=");
  Serial.println("=");
  lcd.print(op);
  Serial.println(op);
  lcd.print(answer);
  Serial.println(answer);
  lcd.print(op);
  Serial.println(op);
  lcd.setCursor(0,1);
  lcd.print("Thank You!");
  Serial.println("Thank You!");

  delay(dt);
  lcd.clear();



  
}