by Sai gowtham

Get the first digit of a number in C#

In this tutorial, we are going to learn about how to get the first digit of a number in C# with the help of examples.

In C#, strings are the sequence of characters, where the index of the first character is 0, the second character is 1, third character is 3 and the last character index -1.

Consider, we have a following number:

int pincode = 67683

To get the first digit of a number in C#:

  1. Convert the number to a string using the ToString() method.

  2. Use the square brackets syntax [] to access the first character of a string.

  3. Now, Convert the character to a string

  4. At final, convert the result back to a number to get the first digit of the number.

Here is an example:

using System;

class GetFirstDigit {
  static void Main() {
      int pinCode = 67683;
      int firstDigit = int.Parse(pinCode.ToString()[0].ToString());
      Console.WriteLine(firstDigit);
  }
}

Output:

6

In the example above, first we converted the number to a string, so we can use the square brackets syntax on it.

Now, you can access the characters of a string, by using the square brackets syntax and specifying an index.

At last we have used the int.Parse() method to convert the string to a number.

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