Level 2 Solutions

int x, y;

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

void loop() {
  if (Serial.available() > 0) { //Check for serial data
    x = Serial.parseInt();  //Read Serial input
    Serial.println(x);
	for (int i = 2; i < x; i++) { //For loop dividing the number by each number between 0 and itself
      if (x % i == 0) { // If it divides then toggles y to 1
		y = 1;
	  }
    }
    if (y==1)
      Serial.println("It is not a prime number");
    else
      Serial.println("It is a prime number");
    y=0;
  }
}

//Initialize variables
char x = 'F';
int y, z;

void setup()
{
  Serial.begin(9600);
  Serial.print("Enter the message to encrypt/decrypt");
}

void loop()
{
  if (Serial.available() > 0) //Check for Serial data
  {
    y = Serial.parseInt(); //Read serial data and store in a variable
    Serial.print("Your integer is: ");
    Serial.println(y);
    z = x ^ y; //XOR operation
    Serial.print("The encrypted/decrypted code is :");
    Serial.println(z);  //Print the encrypted/decrypted value
  }
}