byte segValue[10][7] = {
  {0,0,0,0,0,0,1}, // 0
  {1,0,0,1,1,1,1}, // 1
  {0,0,1,0,0,1,0}, // 2
  {0,0,0,0,1,1,0}, // 3
  {1,0,0,1,1,0,0}, // 4
  {0,1,0,0,1,0,0}, // 5
  {0,1,0,0,0,0,0}, // 6
  {0,0,0,1,1,1,1}, // 7
  {0,0,0,0,0,0,0}, // 8
  {0,0,0,0,1,0,0}  // 9
};

byte segPin[7] = {2, 3, 4, 5, 6, 7, 8}; 
byte digitPin[3] = {10, 11, 12}; 

void setup() {
  
  for (int i = 0; i < 7; i++) {
    pinMode(segPin[i], OUTPUT);
  }

  
  for (int i = 0; i < 7; i++) {
    digitalWrite(segPin[i], HIGH); 
  }

  
  for (int i = 0; i < 3; i++) {
    pinMode(digitPin[i], OUTPUT);
    digitalWrite(digitPin[i], LOW); 
  }
}

void loop() {
  
  displaySingleDigit(9, 2); 
  delay(1000);              

  displayDoubleDigit(9, 9); 
  delay(1000);              

  
  displayTripleDigit(9, 9, 9); 
  delay(1000);              
}


void displaySingleDigit(int num1, int pos1) {
  for (int i = 0; i < 500; i++) {   
    segOutput(pos1, num1);          
    delay(5);                       
  }
}


void displayDoubleDigit(int num1, int num2) {
  for (int i = 0; i < 500; i++) {    
    segOutput(1, num1);  
    delay(5);            
    segOutput(2, num2);  
    delay(5);
  }
}


void displayTripleDigit(int num1, int num2, int num3) {
  for (int i = 0; i < 500; i++) {    
    segOutput(0, num1);  
    delay(5);
    segOutput(1, num2);  
    delay(5);
    segOutput(2, num3);  
    delay(5);
  }
}

void segClear() {
  
  for (int i = 0; i < 7; i++) {
    digitalWrite(segPin[i], HIGH);
  }
}

void segOutput(int d, int Number) {
  
  segClear();
  
  
  digitalWrite(digitPin[d], HIGH);
  
 
  for (int i = 0; i < 7; i++) {
    digitalWrite(segPin[i], segValue[Number][i]);
  }
  

  delay(5);  
  digitalWrite(digitPin[d], LOW);
}