// Define pins for each segment of two 7-segment displays
int a = 2;
int b = 3;
int c = 4;
int d = 5;
int e = 6;
int f = 7;
int g = 8;
int a1 = 9;
int b1 = 10;
int c1 = 11;
int d1 = 12;
int e1 = 13;
int f1 = A0;
int g1 = A1;

void setup() {
  // Set all segment pins as output
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(a1, OUTPUT);
  pinMode(b1, OUTPUT);
  pinMode(c1, OUTPUT);
  pinMode(d1, OUTPUT);
  pinMode(e1, OUTPUT);
  pinMode(f1, OUTPUT);
  pinMode(g1, OUTPUT);
}

// Function to display a single digit on the left (tens place) 7-segment display
void displayDigit(int digit) {
  // Turn off all segments initially
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);

  // Turn on specific segments for the digit
  switch (digit) {
    case 0:
      digitalWrite(a, HIGH);
      digitalWrite(b, HIGH);
      digitalWrite(c, HIGH);
      digitalWrite(d, HIGH);
      digitalWrite(e, HIGH);
      digitalWrite(f, HIGH);
      break;
    case 1:
      digitalWrite(b, HIGH);
      digitalWrite(c, HIGH);
      break;
    case 2:
      digitalWrite(a, HIGH);
      digitalWrite(b, HIGH);
      digitalWrite(d, HIGH);
      digitalWrite(e, HIGH);
      digitalWrite(g, HIGH);
      break;
    case 3:
      digitalWrite(a, HIGH);
      digitalWrite(b, HIGH);
      digitalWrite(c, HIGH);
      digitalWrite(d, HIGH);
      digitalWrite(g, HIGH);
      break;
    case 4:
      digitalWrite(b, HIGH);
      digitalWrite(c, HIGH);
      digitalWrite(f, HIGH);
      digitalWrite(g, HIGH);
      break;
    case 5:
      digitalWrite(a, HIGH);
      digitalWrite(c, HIGH);
      digitalWrite(d, HIGH);
      digitalWrite(f, HIGH);
      digitalWrite(g, HIGH);
      break;
    case 6:
      digitalWrite(a, HIGH);
      digitalWrite(c, HIGH);
      digitalWrite(d, HIGH);
      digitalWrite(e, HIGH);
      digitalWrite(f, HIGH);
      digitalWrite(g, HIGH);
      break;
    case 7:
      digitalWrite(a, HIGH);
      digitalWrite(b, HIGH);
      digitalWrite(c, HIGH);
      break;
    case 8:
      digitalWrite(a, HIGH);
      digitalWrite(b, HIGH);
      digitalWrite(c, HIGH);
      digitalWrite(d, HIGH);
      digitalWrite(e, HIGH);
      digitalWrite(f, HIGH);
      digitalWrite(g, HIGH);
      break;
    case 9:
      digitalWrite(a, HIGH);
      digitalWrite(b, HIGH);
      digitalWrite(c, HIGH);
      digitalWrite(d, HIGH);
      digitalWrite(f, HIGH);
      digitalWrite(g, HIGH);
      break;
  }
}

// Function to display a single digit on the right (units place) 7-segment display
void displayDigit1(int digit) {
  // Turn off all segments initially
  digitalWrite(a1, LOW);
  digitalWrite(b1, LOW);
  digitalWrite(c1, LOW);
  digitalWrite(d1, LOW);
  digitalWrite(e1, LOW);
  digitalWrite(f1, LOW);
  digitalWrite(g1, LOW);

  // Turn on specific segments for the digit
  switch (digit) {
    case 0:
      digitalWrite(a1, HIGH);
      digitalWrite(b1, HIGH);
      digitalWrite(c1, HIGH);
      digitalWrite(d1, HIGH);
      digitalWrite(e1, HIGH);
      digitalWrite(f1, HIGH);
      break;
    case 1:
      digitalWrite(b1, HIGH);
      digitalWrite(c1, HIGH);
      break;
    case 2:
      digitalWrite(a1, HIGH);
      digitalWrite(b1, HIGH);
      digitalWrite(d1, HIGH);
      digitalWrite(e1, HIGH);
      digitalWrite(g1, HIGH);
      break;
    case 3:
      digitalWrite(a1, HIGH);
      digitalWrite(b1, HIGH);
      digitalWrite(c1, HIGH);
      digitalWrite(d1, HIGH);
      digitalWrite(g1, HIGH);
      break;
    case 4:
      digitalWrite(b1, HIGH);
      digitalWrite(c1, HIGH);
      digitalWrite(f1, HIGH);
      digitalWrite(g1, HIGH);
      break;
    case 5:
      digitalWrite(a1, HIGH);
      digitalWrite(c1, HIGH);
      digitalWrite(d1, HIGH);
      digitalWrite(f1, HIGH);
      digitalWrite(g1, HIGH);
      break;
    case 6:
      digitalWrite(a1, HIGH);
      digitalWrite(c1, HIGH);
      digitalWrite(d1, HIGH);
      digitalWrite(e1, HIGH);
      digitalWrite(f1, HIGH);
      digitalWrite(g1, HIGH);
      break;
    case 7:
      digitalWrite(a1, HIGH);
      digitalWrite(b1, HIGH);
      digitalWrite(c1, HIGH);
      break;
    case 8:
      digitalWrite(a1, HIGH);
      digitalWrite(b1, HIGH);
      digitalWrite(c1, HIGH);
      digitalWrite(d1, HIGH);
      digitalWrite(e1, HIGH);
      digitalWrite(f1, HIGH);
      digitalWrite(g1, HIGH);
      break;
    case 9:
      digitalWrite(a1, HIGH);
      digitalWrite(b1, HIGH);
      digitalWrite(c1, HIGH);
      digitalWrite(d1, HIGH);
      digitalWrite(f1, HIGH);
      digitalWrite(g1, HIGH);
      break;
  }
}

void loop() {
  for (int i = 0; i <= 9; i++) {
    for (int j = 0; j <= 9; j++) {
      displayDigit(i);     // Display tens place
      displayDigit1(j);    // Display units place
      delay(1000);         // Wait for 1 second
    }
  }
}