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#include <Keypad.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(14,15,16,17,18,19); 

long num1,num2 ;
double total;
char operation,button;
int n=1;
const byte ROWS = 4;
const byte COLS = 4;

char keys[ROWS][COLS] = {
  {'1','2','3','+'},
  {'4','5','6','-'},
  {'7','8','9','*'},
  {'C','0','=','/'}
};
byte rowPins[ROWS] = {9,8,7,6};
byte colPins[COLS] = {5,4,3,2};    
Keypad customKeypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS);


void setup() 
{
  
  lcd.begin(16,2);
  Serial.begin(9600);
 

}

void loop()
{
  

 
  while(1)
  {

        
    button = customKeypad.getKey(); 
    if (button=='C') 
    {
      num1=0;
      num2=0;
      total=0;
      operation=0;
      lcd.clear();
    }
        
    if (button >='0' && button <='9')
    {
      num1 = num1*10 + (button -'0'); 
      lcd.setCursor(0,0); 
      lcd.print(num1);    
    }
    
	if (num1 !=0 && (button=='-' || button=='+' || button=='*' || button=='/')) 
    {
      operation = button; 
      lcd.setCursor(7,0); 
	  while ((num1/=10) > 0) n++;
	  Serial.println(n);
      if(n >7)
      {
        num1=0;
        num2=0;
        total=0;
        operation=0;
        lcd.clear();
        lcd.print("Error");
        break;
      }
      n=0;
      lcd.print(operation); 
      break;
    }

  }
    
  while(1) 
  {
    if (button =='C')
      break;
    button = customKeypad.getKey();
    if (button=='C') 
    {
      num1=0;
      num2=0;
      total=0;
      operation=0;
      lcd.clear();
      break;
    }
    if (button >='0' && button <='9') 
    {
      num2 = num2*10 + (button -'0');
      int n=1;
	  while ((num1/=10) > 0) n++;
	  Serial.println(n);
      if(n >6)
      {
        num1=0;
        num2=0;
        total=0;
        operation=0;
        lcd.clear();
        lcd.print("Error");
        break;
      }
      lcd.setCursor(8,0);
      lcd.print(num2);
    }
    if (button == '=' && num2 !=0)
    {       
      domath();             
      break;  
    }
  }
    
  while(1) 
  {
    if (button =='C')
      break;

    button = customKeypad.getKey();
    if (button =='C') 
    {
      lcd.clear();
      lcd.setCursor(0,0);
      num1=0;
      num2=0;
      total=0;
      operation=0;
      break;
    }
  }

}


void domath()
{
  switch(operation)
  {
    case '+': 
      total = num1+num2;
      break;
      
    case '-': 
      total = num1-num2;
      break;
      
    case '/':
      if(num2 == 0)
      {
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("ERROR");
      }
      total = (float)num1/(float)num2;
      break;
      
    case '*': 
      total = num1*num2;
      break;
          
  }
    
  lcd.setCursor(0,1);
  lcd.print('=');
  lcd.setCursor(1,1);
  lcd.print(total);   
}