Digits in a number Learn programming C#

Lesson:

Flow Control

Exercise:

Digits in a number

Objetive:

Create a C# program to calculate the number of digits in a positive integer (hint: this can be done by repeatedly dividing by 10). If the user enters a negative integer, the program should display a warning message and proceed to calculate the number of digits for the equivalent positive integer.

For example:
Number = 32
2 digits
Number = -4000
(Warning: it is a negative number) 4 digits

Code:

using System;
public class exercise38
{
    public static void Main()
    {
        int number;
        int digit = 0;

        Console.Write("Number? ");
        number = Convert.ToInt32(Console.ReadLine());

        if (number < 0)
        {
            Console.WriteLine("(Warning: it is a negative number)");
            number = -number;
        }

        while (number > 0)
        {
            number = number / 10;
            digit++;
        }

        if (digit == 0)
            digit = 1;

        Console.WriteLine("{0} digits", digit);
    }
}