int ONE_SECOND = 1000;


int NUMBERS_FOR_BINARY[] = {
    B00111111,          // 0
    B00000110,         // 1
    B01011011,        // 2
    B01001111,       // 3
    B01100110,      // 4
    B01101101,     // 5 
    B01111101,    // 6
    B00000111,   // 7
    B01111111,  // 8
    B01101111, // 9
    };

void setup()
{
    DDRD |= 0b11111111;
}
void loop(){

START:
int RESULT = 0;

do {
     PORTD = NUMBERS_FOR_BINARY[RESULT];
     delay(ONE_SECOND);
     RESULT++;
     if(RESULT==9)
     goto REVERSE;
   } while (RESULT <= 9);

   REVERSE:
    do {
     PORTD = NUMBERS_FOR_BINARY[RESULT];
     delay(ONE_SECOND);
     RESULT--;
     if(RESULT==0)
     goto START;
   } while (RESULT <= 9);
   
    }