How to count the total number of digits in a number in C#

In this tutorial we are going to learn, how to count the number of digits in a given number in C# with the help of examples.

Consider, we have following number in our C# code.

int postalCode = 600583;

To count the total number of digits in a given number, first we need to convert the number to a string then call a .Length property on it. So it returns the total number of digits in number.

In C# the String.Length property returns the number of characters in a string or it returns 0 for the empty string ("").

Here is an example:

using System;

class TotalDigitsCount {
  static void Main() {
    int postalCode = 600583;
    int count = postalCode.ToString().Length;
   Console.WriteLine(count);
  }
}

Output:

6

In the example above, we first called the ToString() method on the number, so it converts the number to a string then we used the Length property to get the total number of digits.

Similarly, we can use the logarthmic solution to get the total number of digits from a number.

Here is an example:

using System;

class TotalDigitsCount {
  static void Main() {
    int postalCode = 600583;
    double count = Math.Floor(Math.Log10(postalCode) + 1);;
    Console.WriteLine(count);
  }
}