int start = 12;
int restart = 13;
int seg[] = {5, 6, 7, 8, 9, 10, 11};
int display[] = {1, 2, 3, 4};
int numbers[] = {
  B11111100, // 0
  B01100000, // 1
  B11011010, // 2
  B11110010, // 3
  B01100110, // 4
  B10110110, // 5
  B10111110, // 6
  B11100000, // 7
  B11111110, // 8
  B11110110  // 9
};

int tenths = 0;
int hundred = 0;
int minutes = 0;
bool running = false;

void setup() {
  pinMode(start, INPUT_PULLUP);
  pinMode(restart, INPUT_PULLUP);

  for (int i = 0; i < 4; i++) {
    pinMode(display[i], OUTPUT);
  }
  for (int i = 0; i < 7; i++) {
    pinMode(seg[i], OUTPUT);
  }
}

void loop() {
  int startState = digitalRead(start);
  int restartState = digitalRead(restart);

  if (startState == LOW) {
    delay(20);
    if (digitalRead(start) == LOW) {
      running= !running;
      while (digitalRead(start) == LOW); 
    }
  }

  if (restartState == LOW) {
    delay(20); 
    if (digitalRead(restart) == LOW) {
      tenths = 0;
      hundred = 0;
      minutes = 0;
      while (digitalRead(restart) == LOW); 
    }
  }

  if (running) {
    for (int i = 0; i < 999; i++) {
    }
    hundred++;
    if (hundred >= 99) {
      hundred = 0;
      tenths++;
    }
    if (tenths > 6) {
      tenths = 0;
      minutes++;
  }
  if (minutes >= 9) {
  }

}
  Serial.print(running);
    Serial.print(tenths);
}