How do I do this program?

[Idahowalker]

Question what's the difference between this:

@letsgooo2912

void loop() {
    buttonState=digitalRead(7);
  if((buttonState==LOW)&&(x<=4)){
    Serial.print(1 << x);
    Serial.print(x, DEC)
    Serial.println(x, BIN);
  }
  x=x+1;
}

and that?

void loop() {
    buttonState=digitalRead(7);
  if((buttonState==LOW)&&(x<=4)){
    Serial.print(1 << x);
    Serial.print(x, DEC)
    Serial.println(x, BIN);
  x=x+1;
}
}