int a = 17;
  int b = 18;
  int c = 13;
  int d = 14;
  int e = 12;
  int f = 16;
  int g = 4;
  int point = 26;

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

void showNumber(int number){
  if (number != 1 && number != 4)
  digitalWrite(a,LOW);
  if (number != 5 && number != 6)
  digitalWrite(b,LOW);
  if (number != 2)
  digitalWrite(c,LOW);
  if (number != 4 && number != 7)
  digitalWrite(d,LOW);
  if (number == 2 || number == 6 || number == 8 || number == 0)
  digitalWrite(e,LOW);
  if (number == 1 || number != 2 && number != 3 && number != 7)
  digitalWrite(f,LOW);
    if (number != 0 && number != 1 && number != 7)
  digitalWrite(g,LOW);
}

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

void loop(){
  for(int i=0;i<10;i++)
{
showNumber(i);
delay(1000);
turnoff();
}
}