int a = 11;
int b = 10;
int c = 9;
int d = 8;
int e = 7;
int f = 6;
int g = 5;
int dp = 4;
int count = 0;

void clearDisplay(void){
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
}

void display0(void){
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
}

void display1(void){
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
}

void display2(void){
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(g, LOW);
}

void display3(void){
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(g, LOW);
}

void display4(void){
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}

void display5(void){
  digitalWrite(a, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}

void display6(void){
  digitalWrite(a, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}

void display7(void){
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
}

void display8(void){
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}

void display9(void){
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
}

void setup() {
  int i;
  for(i=4;i<=11;i++){
    pinMode(i, OUTPUT);
  }
  pinMode(3, INPUT);
}

void loop() {
  clearDisplay();
  if (count == 10){
    count = 0;
  }

 

  switch (count) {
    case 0:
      display0();
      break;
    case 1:
      display1();
      break;
    case 2:
      display2();
      break;
    case 3:
      display3();
      break;
    case 4:
      display4();
      break;
    case 5:
      display5();
      break;
    case 6:
      display6();
      break;
    case 7:
      display7();
      break;
    case 8:
      display8();
      break;
    case 9:
      display9();
      break;
  }
  
  count++;
  delay(1000);
}