Arduino_calculator_performing_simple_arithematic_operations.ino

#include <LiquidCrystal.h>                                      //Header file for LCD 
#include <Keypad.h>                                             //Header file for Keypad 

const byte ROWS = 4;                                            // Four rows
const byte COLS = 4;                                            // Three columns

// Define the Keymap
char keys[ROWS][COLS] = {

  {'7','8','9','/'},

  {'4','5','6','*'},

  {'1','2','3','-'},

  {'C','0','=','+'}

};

byte rowPins[ROWS] = { 0, 1, 2, 3 };                                              // Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte colPins[COLS] = { 4, 5, 6, 7 };                                              // Connect keypad COL0, COL1 and COL2 to these Arduino pins.

Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );                          //  Create the Keypad

const int rs = 8, en = 9, d4 = 10, d5 = 11, d6 = 12, d7 = 13;                                   //Pins to which LCD is connected
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

 long Num1,Num2,Number;
 char key,action;
 boolean result = false;
 
void setup() {
  lcd.begin(16, 2);                                                             //We are using a 16*2 LCD display
  lcd.print("Simple");                                                          //Display a intro message
  lcd.setCursor(0, 1);                                                          // set the cursor to column 0, line 1
  lcd.print("Calculator");                                                      //Display a intro message 

   delay(2000);                                                                 //Wait for display to show info
    lcd.clear();                                                                //Then clean it
}

void loop() {
  
key = kpd.getKey();                                                            //storing pressed key value in a char

if (key!=NO_KEY)
DetectButtons();

if (result==true)
CalculateResult();

DisplayResult();   
}

void DetectButtons()
{ 
     lcd.clear();                                                                             //Then clean it
    if (key=='C')                                                                             //If cancel Button is pressed
    {Serial.println ("Button Cancel"); Number=Num1=Num2=0; result=false;}
    
     if (key == '1')                                                                          //If Button 1 is pressed
    {Serial.println ("Button 1"); 
    if (Number==0)
    Number=1;
    else
    Number = (Number*10) + 1;                                                                 //Pressed twice
    }
    
     if (key == '4')                                                                          //If Button 4 is pressed
    {Serial.println ("Button 4"); 
    if (Number==0)
    Number=4;
    else
    Number = (Number*10) + 4;                                                                //Pressed twice
    }
    
     if (key == '7')                                                                         //If Button 7 is pressed
    {Serial.println ("Button 7");
    if (Number==0)
    Number=7;
    else
    Number = (Number*10) + 7;                                                                //Pressed twice
    } 
  

    if (key == '0')
    {Serial.println ("Button 0");                                                            //Button 0 is Pressed
    if (Number==0)
    Number=0;
    else
    Number = (Number*10) + 0;                                                                //Pressed twice
    }
    
     if (key == '2')                                                                         //Button 2 is Pressed
    {Serial.println ("Button 2"); 
     if (Number==0)
    Number=2;
    else
    Number = (Number*10) + 2;                                                               //Pressed twice
    }
    
     if (key == '5')
    {Serial.println ("Button 5"); 
     if (Number==0)
    Number=5;
    else
    Number = (Number*10) + 5;                                                                //Pressed twice
    }
    
     if (key == '8')
    {Serial.println ("Button 8"); 
     if (Number==0)
    Number=8;
    else
    Number = (Number*10) + 8;                                                               //Pressed twice
    }   
  

    if (key == '=')
    {Serial.println ("Button Equal"); 
    Num2=Number;
    result = true;
    }
    
     if (key == '3')
    {Serial.println ("Button 3"); 
     if (Number==0)
    Number=3;
    else
    Number = (Number*10) + 3;                                                               //Pressed twice
    }
    
     if (key == '6')
    {Serial.println ("Button 6"); 
    if (Number==0)
    Number=6;
    else
    Number = (Number*10) + 6;                                                              //Pressed twice
    }
    
     if (key == '9')
    {Serial.println ("Button 9");
    if (Number==0)
    Number=9;
    else
    Number = (Number*10) + 9;                                                              //Pressed twice
    }  

      if (key == '/' || key == '*' || key == '-' || key == '+')                            //Detecting Buttons on Column 4
  {
    Num1 = Number;    
    Number =0;
    if (key == '/')
    {Serial.println ("Division"); action = '/';}
     if (key == '*')
    {Serial.println ("Multiplication"); action = '*'; }
     if (key == '-')
    {Serial.println ("Subtraction"); action = '-';}
     if (key == '+')
    {Serial.println ("Addition"); action = '+';}  

    delay(100);
  }
  
}

void CalculateResult()
{
  if (action=='+')
    Number = Num1+Num2;

  if (action=='-')
    Number = Num1-Num2;

  if (action=='*')
    Number = Num1*Num2;

  if (action=='/')
    Number = Num1/Num2; 
}

void DisplayResult()
{
  lcd.setCursor(0, 0);                                                                        // set the cursor to column 0, line 1
  lcd.print(Num1); lcd.print(action); lcd.print(Num2); 
  
  if (result==true)
  {lcd.print(" = "); lcd.print(Number);}                                                      //Display the result
  
  lcd.setCursor(0, 1);                                                                        // set the cursor to column 0, line 1
  lcd.print(Number);                                                                          //Display the result
}