Question 3.1

import java.util.Scanner;

public class DigitCount {
    public static void main(String[] args) {
        // Create a Scanner object to read input from the user
        Scanner scanner = new Scanner(System.in);

        // Prompt the user to enter a positive integer
        System.out.print("Enter a positive integer less than 10,000,000,000: ");

        // Read the integer from the user
        long number = scanner.nextLong();

        // Close the Scanner
        scanner.close();

        // Check if the input number is within the valid range
        if (number < 1 || number >= 10000000000L) {
            System.out.println("Invalid input. Please enter a positive integer less than 10,000,000,000.");
        } else {
            // Calculate the number of digits using a loop
            int digitCount = 0;
            while (number > 0) {
                number /= 10; // Remove the rightmost digit
                digitCount++; // Increment the digit count
            }

            // Display the result
            System.out.println("The number of digits in the input is: " + digitCount);
        }
    }
}