Digits in a number

Proposed exercise

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Create a program to calculate how many digits has a positive integer (hint: it can be done by dividing by 10 several times).

If the user enters a negative integer, the program must show a warning message, and proceed with the equivalent positive number.

For example:

Number? 32

2 digits

Number? -4000

(Warning: it is a negative number)

4 digits

Output

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Solution

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

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

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

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

if (digit == 0)
digit = 1;

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