#include <LiquidCrystal.h>
LiquidCrystal lcd(18, 5, 17, 16, 4, 0);
int led_pins[7] = {19, 18, 5, 17, 16, 4, 0};
int on_button = 12;
int off_button = 14;
void setup() {
  Serial.begin(16, 2);
  Serial.println("array of seven");
  pinMode(on_button, INPUT_PULLUP);
  pinMode(off_button, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(on_button) == 0) {
    delay(500);
    lcd.setCursor(3,0);
      lcd.println("hello world");
    }
  
  if (digitalRead(off_button) == 0) {
    delay(500);
    
      lcd.clear();
    }
  }