#include <LiquidCrystal_PCF8574.h>
#include <Wire.h>
#include <time.h>
//initialize the liquid crystal library
//the first parameter is the address
LiquidCrystal_PCF8574 lcd(0x27);

bool runComplete = false;
void setup() {
//initialize lcd screen
lcd.begin(16, 2);
// turn on the backlight
lcd.setBacklight(255);
randomSeed(analogRead(0));
}

void loop() {
  // put your main code here, to run repeatedly:

  if (!runComplete) {
    int num = random(0, 101);
    lcd.setCursor(0,0);
    lcd.print(num);
    lcd.setCursor(0,1);
    bool prime = true;
    for(int i = 2; i < num -1; i++ ) {
      if(num % i == 0) {
        lcd.print("NOT PRIME");
        prime = false;
        break;
      }
    }
    if(prime) {
      if(num != 0) {
      lcd.print("PRIME     ");
      runComplete = true;
      }

    }
    delay(200);
  }
  


}