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When I try to compile the following code in Arduino ,I get the error "expected initializer before 'void'".How can I get the code to work? 

const int LED = 9;
const int BUTON = 2


void setup() {
  pinMode (LED, OUTPUT);
  pinMode (BUTON, INPUT);
}

void loop() {
  if (digitalRead(BUTON) == HIGH);
  {
    digitalWrite(LED, HIGH);
  }
  else
  {
    digitalWrite(LED, LOW);
  }
}
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1
  • 2
    This is actually not an Arduino related problem. Everybody that gets into physical computing should have some basic knowledge in C/C++ and the compiling of such code. Using an Arduino on top of that adds complexity and is more difficult to debug if something does not work as intended. So I hereby encourage you to take some tutorials in writing C/C++ to get a feeling of all the traps that lurk at you along your journey.
    – Kwasmich
    May 28, 2018 at 9:44

1 Answer 1

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4

You are missing a semi-colon after const int BUTON = 2

Each expression should be terminated with a semi-colon. Your code should look like this:

const int LED = 9;
const int BUTON = 2;


void setup() {
  pinMode (LED, OUTPUT);
  pinMode (BUTON, INPUT);
}

void loop() {
  if (digitalRead(BUTON) == HIGH)
  {
    digitalWrite(LED, HIGH);
  }
  else
  {
    digitalWrite(LED, LOW);
  }
}
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