bool buttonState;
bool reading;
bool lastButtonState;
int debounceDelay = 50;
int lastDebounceTime;
int counter;
int numPrint[10][7] = {{0, 0, 0, 0, 0, 0, 1},{1, 0, 0, 1, 1, 1, 1},{0, 0, 1, 0, 0, 1, 0},{0, 0, 0, 0, 1, 1, 0},{1, 0, 0, 1, 1, 0, 0},{0, 1, 0, 0, 1, 0, 0},{0, 1, 0, 0, 0, 0, 0},{0, 0, 0, 1, 1, 1, 1},{0, 0, 0, 0, 0, 0, 0},{0, 0, 0, 0, 1, 0, 0}};

void setup() {
  // put your setup code here, to run once:
  for (int i = 7; i <= 13; i++) {
    pinMode(i, OUTPUT);
  }
  pinMode(4, INPUT);
  Serial.begin(9600);
}

void loop() {

  reading = digitalRead(4);

  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState) {
        counter++;
        Serial.println(counter);
      }
    }
  }

  for (int i = 0; i < 7; i++) {
    digitalWrite(i+7,numPrint[counter%10][i]);
  }

  lastButtonState = reading;
}