Char.Isletterordigit() Method In C#

In this guide, we will explore the Char.IsLetterOrDigit method in C# along with its syntax and illustrative samples.

What is Char.IsLetterOrDigit method?

In C#, the Char.IsLetterOrDigit method from the Char struct is utilized to check if a Unicode character falls within the category of a letter or a numerical digit.

Unicode class members:

There exist various Unicode class elements such as capital letters, small letters, title case characters, transitional characters, novel characters, and numeric digits. This function is capable of being overloaded by accepting varying quantities of parameters.

Syntax:

It has the following syntax:

Example


Public static bool IsLetterOrDigit (char c );

Where character c represents the Unicode character to be assessed.

Return Type:

The methods return a Boolean data type. When a method matches a Unicode letter or decimal digit, it returns True; otherwise, it returns False.

Pseudocode:

Example


function IsLetterOrDigit(character):
    if the character is a letter:
        return true
    else if the character is a digit:
        return true
    else:
        return false
character = 'a' // Example character
isLetterOrDigit = IsLetterOrDigit(character)
output(isLetterOrDigit) // Output: True

Program 1:

Let's consider a scenario to demonstrate the application of the Char.IsLetterOrDigit function in the C# programming language.

Example


using System; 
class ABC { 

	// Main Method 
	static public void Main() 
	{ 
		// Declaration of data type 
		bool res; 
		// checking if P is a 
		// letter or decimal digit 
		char ch1 = 'P'; 
		res = Char.IsLetterOrDigit(ch1); 
		Console.WriteLine(res); 
		// checking if '$' is a 
		// letter or decimal digit 
		char ch2 = '$'; 
		res = Char.IsLetterOrDigit(ch2); 
		Console.WriteLine(res); 
	} 
}

Output:

The <style> element defines a styled container with a background gradient, border radius, padding, margin, and centered text alignment. The container includes an icon and text styled with specific colors and font sizes. The CSS class for this element is </style>.

Program 2:

Let's consider a different instance to demonstrate the Char.IsLetterOrDigit function in C#.

Example


using System;
class Program
{
    static void Main()
    {
        char[] characters = { 'p', '9', '@', ' ' };

        foreach (char ch in characters)
        {
            bool isLetterOrDigit = Char.IsLetterOrDigit(ch);
            Console.WriteLine($"Character '{ch}' is a letter or digit: {isLetterOrDigit}");
        }
    }
}

Output:

The given CSS code snippet defines a placeholder diagram style with a gradient background, rounded corners, padding, and center alignment. It includes an icon with a font size of 3rem and text with a font size of 1rem.

Another technique employed for the identical procedure is the Char.IsLetterOrDigit (String, Int) method.

Char.IsLetterOrDigit (String, Int) method:

The Char.IsLetterOrDigit (String, Int) function is employed to check if a specific character or numeric digit is present at a specified index within a string. If the character or digit matches, the function will output True; otherwise, it will return false.

Syntax:

It has the following syntax:

Example


public static bool IsLetterOrDigit  ( string str, int index );

The parameters are,

It is essential to assess the System.String type within the System.

Index: The position of the character within the string that requires comparison, with the parameter type being System.Int32.

The function returns a value of type System.Boolean. When the function identifies a letter or digit at the specified position within the supplied string, it returns True; otherwise, it returns False.

The exceptions specific to this approach include:

✅ In case the str value is null, an ArgumentNullException will be thrown by the method.
✅ If the index exceeds the final position in str or is below zero, an ArgumentOutOfRangeException will be raised by this function.

Pseudocode:

Example


function IsLetterOrDigit(string, index):
    if the index is out of range for string:
        return false
    else:
        character = string[index]
        if the character is a letter:
            return true
        else if the character is a digit:
            return true
        else:
            return false

string = "abc123"
index = 4
isLetterOrDigit = IsLetterOrDigit(string, index)
output(isLetterOrDigit) // Output: True

Program 1:

Let's consider a scenario to demonstrate the Char.IsLetterOrDigit (String, Int) function in C#.

Example


using System;
public class Program {
   public static void Main(){
      bool res;
      char val = '$';
      Console.WriteLine("Value = "+val);
      res = Char.IsLetterOrDigit(val);
      Console.WriteLine(" "+res);
   }
}

Output:

The CSS code snippet provided below illustrates the styling for a placeholder diagram:

Example


.placeholder-diagram { background: linear-gradient(135deg, #374151 0%, #1f2937 100%); border-radius: 12px; padding: 40px; margin: 20px 0; text-align: center; }
.placeholder-diagram .placeholder-icon { font-size: 3rem; margin-bottom: 10px; }
.placeholder-diagram .placeholder-text { color: #9ca3af; font-size: 1rem; }

Program 2:

Let's consider another instance to demonstrate the Char.IsLetterOrDigit (String, Int) method in C#.

Example


using System; 
class ABC { 
	// Main Method 
	static public void Main() 
	{ 

		// Declaration of data type 
		bool res; 
		// checking for letter or decimal digit 
		// in a string at the desired position 

		string str1 = "Hello123"; 
		res = Char.IsLetterOrDigit(str1, 2); 
		Console.WriteLine(res); 

		// checking for letter or decimal digit 
		// in a string at a desired position 
		string str2 = "Hello@world"; 
		res = Char.IsLetterOrDigit(str2, 3); 
		Console.WriteLine(res); 
	} 
}

Output:

The <style> CSS code snippet defines a styling template for placeholders, including a dark gradient background, rounded corners, padding, margin, and center alignment. It also sets the icon and text styles within the placeholder. This template aids in creating visually appealing and consistent placeholders for web design projects.

Advantages of Char.IsLetterOrDigit method:

There are several advantages of the Char.IsLetterOrDigit method in C#. Some main advantages of the Char.IsLetterOrDigit method are as follows:

✅ Simplicity: It eliminates the need for complex conditional statements and provides a straightforward method of determining if a character is a letter or a numeric.
✅ Readability: By using this method, the code's purpose is made clear, which makes it simpler for other developers to understand its goal.
✅ Localization: The method takes into account the current culture settings, which can be important for applications that need to handle different languages and character sets
✅ Consistency: By following the Unicode standard for character classification, this approach guarantees consistency when checking for letters and digits.
✅ Performance: The approach is probably efficient for use in performance-sensitive applications because it has been optimized for performance.
✅ Safety: Checking for letters and numbers, helps avoid typical programming mistakes such as accidentally utilizing the wrong character ranges or forgetting to include specific characters.

What is Char.IsLetterOrDigit method?

Unicode class members:

Program 1:

Program 2:

Char.IsLetterOrDigit (String, Int) method:

Program 1:

Program 2:

Advantages of Char.IsLetterOrDigit method:

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