int a = 2;
int b = 3;
int c = 4;
int d = 5;
int e = 6;
int f = 7;
int g = 8;

int btn = 10;

int anodPins[] = {A1, A2, A3, A4};

int pins[] = {a, b, c, d, e, f, g};
//C, F, 8, 9

int C[] = {1, 0, 0, 1, 1, 1, 0};
int F[] = {1, 0, 0, 0, 1, 1, 1};
int eight[] = {1, 1, 1, 1, 1, 1, 1};
int nine[] = {1, 1, 1, 1, 0, 1, 1};

int* symbols[] = {C, F, eight, nine};
int symbolCount = 4;

void setup() {
  Serial.begin(115200);
  pinMode(btn, INPUT_PULLUP);

  for (int i = 0; i < 4; i++) {
    pinMode(anodPins[i], OUTPUT);
  }
  for (int i = 0; i < sizeof(pins)/sizeof(pins[0]); i++) {
    pinMode(pins[i], OUTPUT);
    digitalWrite(pins[i], HIGH);
  }
}

int lastBtnState = HIGH;
int state = 0;

int last = 0;

int i = 0;

void loop() {
  int btnState = digitalRead(btn);

  if (btnState != lastBtnState) {
    if (btnState == LOW) {
      state ++;
      Serial.println(state % 2);
    }
  }
  lastBtnState = btnState;
  if (state % 2 == 0) {
    out(symbols[i], anodPins[i], sizeof(pins)/sizeof(pins[0]));
    if (millis() - last >= 1000) {
      i++;
      last = millis();
    }
    if (i == 4) {
      i = 0;
    }
  }
  else {
    off(sizeof(pins)/sizeof(pins[0]));
  }
}


void out(int symbol[], int anodPin, int size) {
  for (int i = 0; i < size; i++) {
    digitalWrite(pins[i], symbol[i] == 1 ? LOW : HIGH);
  }
  for (int i = 0; i < 4; i++) {
    digitalWrite(anodPins[i], anodPins[i] == anodPin ? HIGH : LOW);
  }
}

void off(int size) {
  for (int j = 0; j < 4; j++) {
    for (int i = 0; i < size; i++) {
      digitalWrite(pins[i], HIGH);
    }
    digitalWrite(anodPins[j], HIGH);
  }
}