//     led pin
#define G 5
#define F 4
#define A 2
#define B 3
#define E 8
#define D 7
#define C 6


int wait=1000; //delay
const int size=7;
int leds[size]={A,B,C,D,E,F,G};
bool error=0;

void setup() {
Serial.begin(115200);
  for(int i=0;i<size;i++){
    pinMode(leds[i], OUTPUT);
  }
}

void loop() {

for(int number=0;number<=9;number++){
  ledNumbOn(number);
  if(error){
      Serial.print("Error! Wrong digit: ");
      Serial.println(number);
      error=0;
  }
  delay(wait);
  ledOff();

}


}

void ledNumbOn(int n){

  switch(n){
    case 0:
     for(int i=0;i<size;i++)
     if(leds[i]!=G)
      digitalWrite(leds[i], HIGH);
     break;
    case 1:
       for(int i=0;i<size;i++)
        if(leds[i]!=A && leds[i]!=F && leds[i]!=G && leds[i]!=E && leds[i]!=D)
          digitalWrite(leds[i], HIGH);
     break;
    case 2:
     for(int i=0;i<size;i++)
        if(leds[i]!=F && leds[i]!=C)
          digitalWrite(leds[i], HIGH);
     break;
    case 3:
     for(int i=0;i<size;i++)
        if(leds[i]!=F && leds[i]!=E)
          digitalWrite(leds[i], HIGH);
     break;
     case 4:
     for(int i=0;i<size;i++)
        if(leds[i]!=A && leds[i]!=E && leds[i]!=D)
          digitalWrite(leds[i], HIGH);
     break;
    case 5:
     for(int i=0;i<size;i++)
        if(leds[i]!=B && leds[i]!=E)
          digitalWrite(leds[i], HIGH);
     break;
    case 6:
     for(int i=0;i<size;i++)
        if(leds[i]!=B)
          digitalWrite(leds[i], HIGH);
     break;
    case 7:
     for(int i=0;i<size;i++)
        if(leds[i]!=F && leds[i]!=G && leds[i]!=E && leds[i]!=D)
          digitalWrite(leds[i], HIGH);
     break;
    case 8:
     for(int i=0;i<size;i++)
          digitalWrite(leds[i], HIGH);
     break;
    case 9:
     for(int i=0;i<size;i++)
        if(leds[i]!=E)
          digitalWrite(leds[i], HIGH);
     break;
    default:
      for(int i=0;i<size;i++)
        if(leds[i]!=B && leds[i]!=C) // "E" error
          digitalWrite(leds[i], HIGH);
      error=1;
     break;
  }
}

void ledOff(){
  for(int i=0;i<size;i++)
     if(digitalRead(leds[i]))
      digitalWrite(leds[i], LOW);
}