Arduino Project 001 7 segment display 4 digits

//arduino 4 digit 7 segment project

#define DIGIT_ON  HIGH
#define DIGIT_OFF  LOW

int time = 1;

int x=100;

int a = 1;
int b = 2;
int c = 3;
int d = 4;
int e = 5;
int f = 6;
int g = 7;
//segments
char seg[]= {a,b,c,d,e,f,g};
//numbers and others
int one[] = {0,0,1,1,0,0,0};
int two[] = {1,1,0,1,1,0,1};
int three[] = {0,1,1,1,1,0,1};
int four[] = {0,0,1,1,0,1,1};
int five[] = {0,1,1,0,1,1,1};
int six[] = {1,1,1,0,1,1,1};
int seven[] = {0,0,1,1,1,0,0};
int eight[] = {1,1,1,1,1,1,1};
int nine[] = {0,0,1,1,1,1,1};
int zero[] = {1,1,1,1,1,1,0};

int hifen[] = {0,0,0,0,0,0,1};
int o[] = {1,1,1,0,0,0,1};
int eye[] = {1,1,1,1,1,0,0};

int t;

void setup(){
 pinMode(13, OUTPUT);// 4 digit
 pinMode(12, OUTPUT);// 3 digit
 pinMode(11, OUTPUT);// 2 digit
 pinMode(10, OUTPUT);// 1 digit

 pinMode(g, OUTPUT);
 pinMode(f, OUTPUT);
 pinMode(e, OUTPUT);
 pinMode(d, OUTPUT);
 pinMode(c, OUTPUT);
 pinMode(b, OUTPUT);
 pinMode(a, OUTPUT);
}

void loop(){
  //counter
  /*
  for(int i=0; i<10; i++){
    for(int j=0; j<10; j++){
      for(int k=0; k<10; k++){
        for(int l=0; l<10; l++){
          t=120;
          while(t!=0){
            printNumber(i,3);
            delay(time);
            printNumber(j,2);
            delay(time);
            printNumber(k,1);
            delay(time);
            printNumber(l,0);
            delay(time);
            t--;
          }
        }
      }
    }
  }*/


  //loop
  for(int i =0 ; i<8 ; i++){
     lightNumber(o);
     digitalWrite((10),LOW);
     delay(200);
     lightNumber(hifen);
     digitalWrite((11),LOW);
     delay(200);
     lightNumber(hifen);
     digitalWrite((12),LOW);
     delay(200);
     lightNumber(o);
     digitalWrite((13),LOW);
     delay(200);
     lightNumber(hifen);
     digitalWrite((12),LOW);
     delay(200);
     lightNumber(hifen);
     digitalWrite((11),LOW);
     delay(200);

  }
}

void printNumber(int n, int index){
  clearLeds();

  switch (n){
    case 1:
      lightNumber(one);
      digitalWrite((10+index),LOW);
      break;
    case 2:
      lightNumber(two);
      digitalWrite((10+index),LOW);
      break;
    case 3:
      lightNumber(three);
      digitalWrite((10+index),LOW);
      break;
    case 4:
      lightNumber(four);
      digitalWrite((10+index),LOW);
      break;
    case 5:
      lightNumber(five);
      digitalWrite((10+index),LOW);
      break;
    case 6:
      lightNumber(six);
      digitalWrite((10+index),LOW);
      break;
    case 7:
      lightNumber(seven);
      digitalWrite((10+index),LOW);
      break;
    case 8:
      lightNumber(eight);
      digitalWrite((10+index),LOW);
      break;
    case 9:
      lightNumber(nine);
      digitalWrite((10+index),LOW);
      break;
    case 0:
      lightNumber(zero);
      digitalWrite((10+index),LOW);
      break;
    case 99:
      int test[] = {1,1,0,1,1,0,1};
      lightNumber(test);
      digitalWrite((10+index),LOW);
      break;
  }
}

void lightNumber(int c[]){
  clearLeds();
  for(int i=0; i<7; i++){
    if(c[i]==1){
      digitalWrite(seg[i], HIGH);
    }
  }
}



void clearLeds(){
  for(int i=0; i<7; i++){
    digitalWrite(seg[i], LOW);
  }
  digitalWrite(13, HIGH);
  digitalWrite(12, HIGH);
  digitalWrite(11, HIGH);
  digitalWrite(10, HIGH);
}