// TEAM 2 - ACTIVITY 3 - PROCEDURE
// Finding the Largest Number


#include <LiquidCrystal.h>
#include <Keypad.h>
#include <Servo.h>


LiquidCrystal lcd(12, 11, 10, 9, 8, 7);


const byte ROWS = 4;
const byte COLUMNS = 4;
byte rPins[ROWS] = {5, 4, 3, 2};
byte cPins[COLUMNS] = {A3, A2, A1, A0};
char keys[ROWS][COLUMNS] = {
  {'1', '2', '3', '+'},
  {'4', '5', '6', '-'},
  {'7', '8', '9', '*'},
  {'.', '0', '=', '/'}
};

Keypad keypad = Keypad(makeKeymap(keys), rPins, cPins, ROWS, COLUMNS);

void setup() {
  Serial.begin(115200);
  lcd.begin(16, 2);
  lcd.setCursor(0, 0); 
}

void loop() {
    
  double *data;
  lcd.print("NO. OF ELEMENTS:"); 
  lcd.setCursor(0, 1); 
  char key = NULL;
  String elements = "";
  String inputElements = "";
  int n;
  while (key != '=') { 
    key = keypad.getKey();
    if (key >= '0' && key <= '9') 
    {
      lcd.print(key);
      elements += key;
    }
  }
  n = elements.toDouble(); 
  delay(1000);
  lcd.clear();

 
  data = (double *)calloc(n, sizeof(double));

  
  for (int i = 0; i < n; ++i) {
    lcd.setCursor(0, 0);
    lcd.print("COMPARE ELEMENTS(" + String(n) + "):");
    lcd.setCursor(0, 1);
    key = NULL;
    while (key != '=') { 
      key = keypad.getKey();
      if (key >= '0' && key <= '9' || key == '.') {
        inputElements += key;
        lcd.print(key);
      }
    }
    data[i] = inputElements.toDouble();
    inputElements = "";
    lcd.clear();  
    }

  delay(1000);
  lcd.clear();
  lcd.setCursor(0, 0);

  lcd.print("LARGEST NUMBER:");
  lcd.setCursor(0, 1);
 

  for (int i = 1; i < n; ++i) {
    if (*data < *(data + i)) {
      *data = *(data + i);
    }
  }
  lcd.print(*data);
  while (true) {
    continue;
  }
}