int nut=12;
int khoidonglenh=0;
int dem=1;
int led=13;
bool lenhtru=0;
void setup() {
  // put your setup code here, to run once:
   DDRB=B00101111;
   DDRD=B11110000;
   PORTB=B00011111;
   PORTD=B11110000;
}
// A B C D E F G  DP
// 4 5 6 7 8 9 10 11
void in(int x)
{
  switch (x){
      case 1 :
         PORTD=B10011111; PORTB=B11111111;break;
      case 2 :
         PORTD=B01001111; PORTB=B11111010;break;
      case 3 :
         PORTD=B00001111; PORTB=B11111011;break;
      case 4 :
         PORTD=B10011111; PORTB=B11111001;break;
      case 5 :
         PORTD=B00101111; PORTB=B11111001;break;
      case 6 :
         PORTD=B00101111; PORTB=B11111000;break;
      case 7 :
         PORTD=B10001111; PORTB=B11111111;break;
      case 8 :
         PORTD=B00001111; PORTB=B11111000;break;
      case 9 :
         PORTD=B00001111; PORTB=B11111001;break;         
  }
}
void loop() {
  int docnut=digitalRead(nut);
  if(docnut==0) {khoidonglenh=!khoidonglenh;delay(500);}
  if(khoidonglenh)
  {
    if(dem<9 && lenhtru==0)
    {

      in(dem);
      dem++;
    }
    else if(dem==9)
    {
      in(dem);
      lenhtru=!lenhtru;
      dem--;
    }
    else if(lenhtru==1 && dem>1)
    {

      in(dem);
      dem--;
    }
    else if(dem==1)
    {
      in(dem);
      lenhtru=!lenhtru;
      dem++;
    }
    delay(300);
    }
  if(khoidonglenh==0) {  PORTD=B11111111;PORTB=B11011111;dem=1;  }
  
}