pointer.ino

void setup() {
  Serial.begin(9600);
  int firstvalue, secondvalue;
  int * mypointer;
  mypointer = &firstvalue;
  *mypointer = 10;
  mypointer = &secondvalue;
  *mypointer = 20;

  Serial.println(firstvalue);
  Serial.println(secondvalue);
}

void loop() {}