# include <LiquidCrystal.h>
int RS=7;
int E=8;
int D4=9;
int D5=10;
int D6=11;
int D7=12;
int dt=1000;
float first;
float sec;
String op;
int result;

LiquidCrystal lcd(RS,E,D4,D5,D6,D7);

void setup() {
  // put your setup code here, to run once:
lcd.begin(16,2);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
   lcd.setCursor(0,0);
  lcd.print("What is your ");
  lcd.setCursor(0,1);
  lcd.print("first number?");
  Serial.print(" ");
   while(Serial.available()==0){
  
  }
  first=Serial.parseFloat();
lcd.clear();

lcd.setCursor(0,0);
lcd.print("What is your ");
lcd.setCursor(0,1);
lcd.print("second number?");
while(Serial.available()==0){
}  
sec=Serial.parseFloat();
lcd.clear();

lcd.setCursor(0,0);
lcd.print("what is your  ");
lcd.setCursor(0,1);
lcd.print("operator?");
  while(Serial.available()==0){
  
  }
op=Serial.readString();
lcd.clear();

  
}