Count Digits of a Number

/*
 * Problem : Count the digits of an integer.
 * Input   : One integer.
 * Output  : The number of digits.
 * Approach: Divide by 10 until the number is 0.
 * Time    : O(d)
 * Space   : O(1)
 * Java    : 8 or newer.
 */
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        long number = Math.abs(new Scanner(System.in).nextLong());

        // Step 1: Zero has one digit. The loop below would count 0 digits, so we handle it first.
        if (number == 0) {
            System.out.println(1);
            return;
        }

        // Step 2: Start the counter at 0.
        int count = 0;

        // Step 3: Repeat until the number becomes 0.
        while (number > 0) {
            // Step 4: Remove the last digit. Example: 12345 / 10 = 1234.
            number = number / 10;

            // Step 5: Count the removed digit.
            count++;
        }

        // Step 6: Print the count.
        System.out.println(count);
    }
}