int a = 2;
int b = 3;
int c = 4;
int d = 2;
int e = 6;
int f = 7;
int g = 8;
int dp = 9;

void setup () {

  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(dp, INPUT);
}

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

void displayOne() {
  clearDisplay ();// Turn everything OFF first
  digitalWrite (b, HIGH); // Turn ON segment b
  digitalWrite (c, HIGH); // Turn ON segment c
}

void loop () {
  
}