#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup() {
  // put your setup code here, to run once:
  pinMode(3,OUTPUT);
  lcd.begin(16, 2);
  lcd.setCursor(5,0);
  lcd.print("Hello!");
  delay(1500);
  lcd.clear();
  delay(500);
  lcd.setCursor(8,0);
  lcd.print("Binary");
  lcd.setCursor(8,1);
  lcd.print("Decimal");
}

void displayBinary(int arr[]){
  int sum = 0;
  bool added = false;
  for(int i = 0;i<4;++i){
    lcd.setCursor(i,0);
    lcd.print(arr[i]);
    sum += (arr[i] * pow(2,3-i));
    if((arr[0]==1 | arr[1] == 1)&(!added)){
      sum += 1;
      added = true;
    }
  }
  lcd.setCursor(0,1);
  lcd.print(String(sum) + " ");
}

void loop() {
  int binaryInputs[4] = {digitalRead(A0),digitalRead(A1),digitalRead(A2),digitalRead(A3)};
  displayBinary(binaryInputs);
}