int randomNumber;
int randomNumberTWO;
int randomResultNumb;


const int buttonPinMULT = 2;  // the number of the pushbutton pin
int buttonStateMULT = 0;  // variable for reading the pushbutton status

const int buttonPinADD = 3;  // the number of the pushbutton pin
int buttonStateADD = 0;  // variable for reading the pushbutton status

const int buttonPinSUB = 4;  // the number of the pushbutton pin
int buttonStateSUB = 0;  // variable for reading the pushbutton status



// START custom fuctions ection ---------------------------  <
int multFunction (int numOne, int numTwo)
{
  int result  = numOne * numTwo;
  return result;
}

int addFunction (int numOne, int numTwo)
{
  int result  = numOne + numTwo;
  return result;
}

int subFunction (int numOne, int numTwo)
{
  int result  = numOne - numTwo;
  return result;
}
// END custom fuctions ection ---------------------------  <



void setup()
{
  Serial.begin(9600);

//button setup
  pinMode(buttonPinMULT, INPUT);
  pinMode(buttonPinADD, INPUT);
  pinMode(buttonPinSUB, INPUT);

//Random number generator
  randomSeed(analogRead(0));
  randomNumber = random(2, 4);
  randomNumberTWO = random(1, 10);
  
  delay(10);

}


void loop() 
{
  buttonStateMULT = digitalRead(buttonPinMULT);
  buttonStateADD = digitalRead(buttonPinADD);
  buttonStateSUB = digitalRead(buttonPinSUB);


  if (buttonStateMULT == HIGH) 
  {
    // Multiplication 
    int mult =  multFunction (randomNumber,randomNumberTWO);
    Serial.println("Multiplication : " + 
    String(randomNumber) +'x' + String(randomNumberTWO) + '=' + String(mult));
  } 
  else if(buttonStateADD == HIGH) 
  {
    // Addition 
    int add =  addFunction (randomNumber,randomNumberTWO);
    Serial.println("Addition : " + 
    String(randomNumber) +'+' + String(randomNumberTWO) + '=' + String(add));

  }
  else if(buttonStateSUB == HIGH) 
  {
    // Subtraction 
    int sub =  subFunction (randomNumber,randomNumberTWO);
    Serial.println("Subtraction: " + 
    String(randomNumber) +'-' + String(randomNumberTWO) + '=' + String(sub));

  }

}