void setup() {    
  pinMode(2, OUTPUT); //a
  pinMode(3, OUTPUT); //b
  pinMode(4, OUTPUT); //c
  pinMode(5, OUTPUT); //d
  pinMode(6, OUTPUT); //e
  pinMode(7, OUTPUT); //f
  pinMode(8, OUTPUT); //g
  pinMode(9, OUTPUT); //dp 
}
void loop() {  
  //4
  digitalWrite(2,LOW); //a
  digitalWrite(3,HIGH); //b
  digitalWrite(4,HIGH); //c
  digitalWrite(5,LOW); //d
  digitalWrite(6,LOW); //e
  digitalWrite(7,HIGH); //f
  digitalWrite(8,HIGH); //g
  digitalWrite(9,LOW); //dp
  delay(1000); 
  //5
  digitalWrite(2,HIGH); //a
  digitalWrite(3,LOW); //b
  digitalWrite(4,HIGH); //c
  digitalWrite(5,HIGH); //d
  digitalWrite(6,LOW); //e
  digitalWrite(7,HIGH); //f
  digitalWrite(8,HIGH); //g
  digitalWrite(9,LOW); //dp
  delay(1000); 
  //E
  digitalWrite(2,HIGH); //a
  digitalWrite(3,LOW); //b
  digitalWrite(4,LOW); //c
  digitalWrite(5,HIGH); //d
  digitalWrite(6,HIGH); //e
  digitalWrite(7,HIGH); //f
  digitalWrite(8,HIGH); //g
  digitalWrite(9,LOW); //dp
  delay(1000); 
}