int A = 4;
int B = 5;
int C = 8;
int D = 7;
int E = 6;
int F = 3;
int G = 2;
int DP = 9;

void setup() {
  // Defining Pin Modes
  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(D, OUTPUT);
  pinMode(E, OUTPUT);
  pinMode(F, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(DP, OUTPUT);
}

void loop() {
  // Turn on all the segment one by one
  digitalWrite(A, HIGH);
  delay(500);
  digitalWrite(B, HIGH);
  delay(500);
  digitalWrite(C, HIGH);
  delay(500);
  digitalWrite(D, HIGH);
  delay(500);
  digitalWrite(E, HIGH);
  delay(500);
  digitalWrite(F, HIGH);
  delay(500);
  digitalWrite(G, HIGH);
  delay(500);
  digitalWrite(DP, HIGH);
  delay(500);
  // Turn off all the segment at once
  digitalWrite(A, LOW);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);
  digitalWrite(E, LOW);
  digitalWrite(F, LOW);
  digitalWrite(G, LOW);
  digitalWrite(DP, LOW);
  delay(500);
}