int seg []={0xfe,0x38,0xdd,0x7d,0x3b,0x77,0xf7,0x3c,0xff,0x7f};
int up = 9;
int dw = 10;
int count = 0;
void setup() {
  // put your setup code here, to run once:
  for (int i=0;i<=7;i++)
    pinMode(i, OUTPUT);
  pinMode(up, INPUT_PULLUP);
  pinMode(dw, INPUT_PULLUP);
  //DDRD = 0xff;

}

void loop() {
  // cleck:
  /*for (int j=0; j<=9; j++)
  {
    PORTD = seg[j];
    delay(1000);
  }
  */
if(digitalRead(up) == 0 && count <= 8)
  count ++;
if(digitalRead(dw) == 0 && count >= 1)
  count --;
PORTD = seg[count];
delay(250);
 
}