int a = 2;
int b = 3;
int c = 4;
int d = 5;
int e = 6;
int f = 7;
int g = 8;

int sw1 = 9;   // Increment button
int sw2 = 10;  // Decrement button

int count = 0;

void setup()
{
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);

  pinMode(sw1, INPUT);
  pinMode(sw2, INPUT);
}

void loop()
{
  if(count > 9)
    {
      count = 0;
    }

  if (digitalRead(sw1) == HIGH)
  {
    count++;
    if (count > 9)
      count = 0;
    delay(300);
  }

  if (digitalRead(sw2) == HIGH)
  {
    count--;
    if (count < 0)
      count = 9;
    delay(300);
  }


  switch (count)
{
  case 0: // a b c d e f
    digitalWrite(a,1); digitalWrite(b,1); digitalWrite(c,1);
    digitalWrite(d,1); digitalWrite(e,1); digitalWrite(f,1);
    digitalWrite(g,0);
    break;

  case 1: // b c
    digitalWrite(a,0); digitalWrite(b,1); digitalWrite(c,1);
    digitalWrite(d,0); digitalWrite(e,0); digitalWrite(f,0);
    digitalWrite(g,0);
    break;

  case 2: // a b d e g
    digitalWrite(a,1); digitalWrite(b,1); digitalWrite(c,0);
    digitalWrite(d,1); digitalWrite(e,1); digitalWrite(f,0);
    digitalWrite(g,1);
    break;

  case 3: // a b c d g
    digitalWrite(a,1); digitalWrite(b,1); digitalWrite(c,1);
    digitalWrite(d,1); digitalWrite(e,0); digitalWrite(f,0);
    digitalWrite(g,1);
    break;

  case 4: // b c f g
    digitalWrite(a,0); digitalWrite(b,1); digitalWrite(c,1);
    digitalWrite(d,0); digitalWrite(e,0); digitalWrite(f,1);
    digitalWrite(g,1);
    break;

  case 5: // a c d f g
    digitalWrite(a,1); digitalWrite(b,0); digitalWrite(c,1);
    digitalWrite(d,1); digitalWrite(e,0); digitalWrite(f,1);
    digitalWrite(g,1);
    break;

  case 6: // a c d e f g
    digitalWrite(a,1); digitalWrite(b,0); digitalWrite(c,1);
    digitalWrite(d,1); digitalWrite(e,1); digitalWrite(f,1);
    digitalWrite(g,1);
    break;

  case 7: // a b c
    digitalWrite(a,1); digitalWrite(b,1); digitalWrite(c,1);
    digitalWrite(d,0); digitalWrite(e,0); digitalWrite(f,0);
    digitalWrite(g,0);
    break;

  case 8: // all segments
    digitalWrite(a,1); digitalWrite(b,1); digitalWrite(c,1);
    digitalWrite(d,1); digitalWrite(e,1); digitalWrite(f,1);
    digitalWrite(g,1);
    break;

  case 9: // a b c d f g
    digitalWrite(a,1); digitalWrite(b,1); digitalWrite(c,1);
    digitalWrite(d,1); digitalWrite(e,0); digitalWrite(f,1);
    digitalWrite(g,1);
    break;
  }
}