int digs[] = {9, 10, 11, 12};
int segs[] = {2, 3, 4, 5, 6, 7, 8};
byte nums[] = {
  B1000000,
  B1111001,
  B0100100,
  B0110000,
  B0011001,
  B0010010,
  B0000010,
  B1111000,
  B0000000,
  B0010000
};
void setup() {
  // put your setup code here, to run once:
  for (int i : segs)
  {
    pinMode(i, OUTPUT);
  }

  for (int i : digs)
  {
    pinMode(i, OUTPUT);
  }

  digitalWrite(digs[0], 1);
}

void loop() {
  // put your main code here, to run repeatedly:
  for (int i = 0; i <= 9; i++)
  {
    showNum(i);
  }
}

void showNum(int num)
{
  int readBit;

  switch (num)
  {
    case 0:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[0], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 1:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[1], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 2:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[2], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 3:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[3], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 4:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[4], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 5:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[5], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 6:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[6], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 7:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[7], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 8:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[8], i);
        digitalWrite(segs[i], readBit);
      }
      break;

    case 9:
      for (int i = 0; i < 10; i++)
      {
        readBit = bitRead(nums[9], i);
        digitalWrite(segs[i], readBit);
      }
      break;
  }
}