#define Button 10
#define LED 12
int sw, c = 0;

void setup()
{
  pinMode(LED, OUTPUT);
  pinMode(Button, INPUT_PULLUP);
  Serial.begin(9600);
  Serial.println("Push button counter:");
}

void loop()
{
  sw = digitalRead(Button);
  if (sw == 0)
  {
    delay(250);
    c++;
    digitalWrite(LED, c % 2);
    Serial.print(c);
    if (c%2==1){
    Serial.println(" - ON");
    }
    else{
    Serial.println(" - OFF");
    }
  }
}