//7 Segments --->> Common Anode
const int SEGMENT_PIN[7] = {2, 3, 4, 5, 6, 7, 8};
#define SWITCH_PIN  9

unsigned long time = 100;
int i;
bool dir = false;

void setup() {
  Serial.begin(9600);
  for (int i = 0; i < 6; i++) pinMode(SEGMENT_PIN[i], OUTPUT);
  for (int i = 0; i < 6; i++) digitalWrite(SEGMENT_PIN[i], HIGH);
  pinMode(SWITCH_PIN, INPUT_PULLUP);
}

void loop() {
  digitalWrite(SEGMENT_PIN[i], LOW);
  delay(time);
  digitalWrite(SEGMENT_PIN[i], HIGH);

  if (digitalRead(SWITCH_PIN) == 0) dir = !dir;

  if (dir) i--;
  else i++;

  if (i > 5) i = 0;
  if (i < 0) i = 5;
}