int a = 0b00010000, b;


void setup() {
  // put your setup code here, to run once:


  Serial.begin(9600);
  Serial.println(a, BIN);
  b = (a << -1);
  Serial.println(b, BIN);

  b = (a << -2);
  Serial.print(b, BIN);
}

void loop() {
  // put your main code here, to run repeatedly:

}