// Define the pin numbers for each segment (a, b, c, d, e, f, g)
int segmentPins[] = {2, 3, 4, 5, 6, 7, 8};

void setup() {
  // Set the segment pins as OUTPUT
  for (int i = 0; i < 7; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }
}

void loop() {
  // Display numbers from 0 to 9 using a switch statement
  for (int number = 0; number <= 9; number++) {
    displayNumber(number);
    delay(1000); // Display each number for 1 second
  }
}

// Function to display a number on the 7-segment display using switch case
void displayNumber(int number) {
  // Define the common cathode 7-segment display patterns for numbers 0 to 9
  byte patterns[] = {
    B00111111, // 0
    B00000110, // 1
    B01011011, // 2
    B01001111, // 3
    B01100110, // 4
    B01101101, // 5
    B01111101, // 6
    B00000111, // 7
    B01111111, // 8
    B01101111  // 9
  };

  // Check if the number is within the valid range (0 to 9)
  if (number >= 0 && number <= 9) {
    // Display the number by setting the corresponding segments using switch case
    for (int segment = 0; segment < 7; segment++) {
      if (bitRead(patterns[number], segment)) {
        digitalWrite(segmentPins[segment], HIGH);
      } else {
        digitalWrite(segmentPins[segment], LOW);
      }
    }
  }
}