int disp_pin[8];	

void define_segment_pins(int a, int b, int c, int d, int e, int f, int g, int dp)	/* Assigns 7-segment display pins to board */
{   
  disp_pin[0] = a;
  disp_pin[1] = b;
  disp_pin[2] = c;
  disp_pin[3] = d;
  disp_pin[4] = e;
  disp_pin[5] = f;
  disp_pin[6] = g;
  disp_pin[7] = dp;
}

void display_number(int num)	/* Function for displaying number (0-9) */
{
  switch(num)
  {
    case 0:
    digitalWrite(disp_pin[0], HIGH);
    digitalWrite(disp_pin[1], HIGH);
    digitalWrite(disp_pin[2], HIGH);
    digitalWrite(disp_pin[3], HIGH);
    digitalWrite(disp_pin[4], HIGH);
    digitalWrite(disp_pin[5], HIGH);
    digitalWrite(disp_pin[6], HIGH);
    digitalWrite(disp_pin[7], HIGH);
    break;
    case 1:
    digitalWrite(disp_pin[0], LOW);
    digitalWrite(disp_pin[1], LOW);
    digitalWrite(disp_pin[2], LOW);
    digitalWrite(disp_pin[3], LOW);
    digitalWrite(disp_pin[4], LOW);
    digitalWrite(disp_pin[5], LOW);
    digitalWrite(disp_pin[6], LOW);
    digitalWrite(disp_pin[7], LOW);
    break;
  }
}

void setup() {
  pinMode(6, OUTPUT);	
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  define_segment_pins(28,27,26,22,21,20,19,18);	
}

void loop() {
  int i;
  for(i = 0; i<=1; i++)
  {
    display_number(i);
    delay(500);
  }
}