int a = 4, b = 2, c = 18, d = 19, e = 21, f = 22, g = 23, led = 13;

void setup()
{
Serial.begin(115200);
 pinMode(a, OUTPUT);
 pinMode(b, OUTPUT);
 pinMode(c, OUTPUT);
 pinMode(d, OUTPUT);
 pinMode(e, OUTPUT);
 pinMode(f, OUTPUT);
 pinMode(g, OUTPUT);
 pinMode(led, OUTPUT);
}

void loop() { 
  for(int ss = 0; ss <= 10; ss++){ 
    
     if(ss == 0){
       zero();
      delay(1000);
     }
     if(ss == 1){
       one();
       delay(1000);
     }
     if(ss == 2){
       two();
       delay(1000);
     }
     if(ss == 3){
       three();
      digitalWrite(led,HIGH);
      delay(1000);
      digitalWrite(led,LOW);
     }
     if(ss == 4){
       four();
       delay(1000);
     }
     if(ss == 5){
       five();
       delay(1000);
     }
     if(ss == 6){
       six();
       delay(1000);
     }
     if(ss == 7){
       seven();
      digitalWrite(led,HIGH);
      delay(1000);
      digitalWrite(led,LOW);
     }
     if(ss == 8){
       eight();
       delay(1000);
     }
     if(ss == 9){
       nine();
       delay(1000);
     }
   }
}

void zero() { 
 digitalWrite(a, LOW);
 digitalWrite(b, LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, LOW);
 digitalWrite(f, LOW);
 digitalWrite(g, HIGH);
}
void one() { 
 digitalWrite(a, HIGH);
 digitalWrite(b, LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, HIGH);
 digitalWrite(e, HIGH);
 digitalWrite(f, HIGH);
 digitalWrite(g, HIGH);
}
void two() { 
 digitalWrite(a, LOW);
 digitalWrite(b, LOW);
 digitalWrite(c, HIGH); 
 digitalWrite(d, LOW);
 digitalWrite(e, LOW);
 digitalWrite(f, HIGH); 
 digitalWrite(g, LOW);
}
void three() { 
 digitalWrite(a, LOW);
 digitalWrite(b, LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, HIGH); 
 digitalWrite(f, HIGH); 
 digitalWrite(g, LOW);
}
void four() { 
 digitalWrite(a, HIGH); 
 digitalWrite(b, LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, HIGH); 
 digitalWrite(e, HIGH); 
 digitalWrite(f, LOW);
 digitalWrite(g, LOW);
}
void five() { 
 digitalWrite(a, LOW);
 digitalWrite(b, HIGH); 
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, HIGH); 
 digitalWrite(f, LOW);
 digitalWrite(g, LOW);
}
void six() { 
 digitalWrite(a, LOW);
 digitalWrite(b, HIGH); 
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, LOW);
 digitalWrite(f, LOW);
 digitalWrite(g, LOW);
}
void seven() { 
 digitalWrite(b, LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, HIGH);
 digitalWrite(e, HIGH);
 digitalWrite(f, HIGH);
 digitalWrite(g, HIGH);
}
void eight() { 
 digitalWrite(a, LOW);
 digitalWrite(b, LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, LOW);
 digitalWrite(f, LOW);
 digitalWrite(g, LOW);
}
void nine() { 
 digitalWrite(a, LOW);
 digitalWrite(b,LOW);
 digitalWrite(c, LOW);
 digitalWrite(d, LOW);
 digitalWrite(e, HIGH);
 digitalWrite(f, LOW);
 digitalWrite(g, LOW);
}