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C# - Char Struct - GeeksforGeeks

Last Updated : 11 Jul, 2025

In C#, the Char struct is used to represent a single Unicode character as a UTF-16 code unit, defined under the System namespace. A Char in C# is a 16-bit value, and it can represent characters in the Basic Multilingual Plane (BMP). Characters beyond 0xFFFF are represented by surrogate pairs (two Char values).

• Char Struct Range: The Char range in C# is from 0x0000 to 0xFFFF. For characters outside this range, UTF-16 encoding uses a surrogate pair of Char values.
• Unicode: Represent a Unicode character in the .NET Framework using a unique 21-bit code point as defined by the Unicode Standard.
• Methods: The Char structure provides methods to convert, compare, and check the Unicode category of a Char object.

• MaxValue: It is a constant field that represents the largest possible value of a Char.
• MinValue: It is a constant field that represents the smallest possible value of a Char.

Example:

using System;

public class Geeks
{
    public static void Main()
    {
        // Storing first character of string
        char c = "Hello"[0];
       // Stroring a character in char struct
        char c2 = 'h';
        
        Console.WriteLine(c+ " "+c2);
       
    }
}

Methods

Description

CompareTo()

Compares this char with another, returning a negative value if less, zero if equal, and positive if greater.

ConvertFromUtf32(Int32)

Converts the specified Unicode code point into a UTF-16 encoded string.

ConvertToUtf32()

Equals()

GetHashCode()

GetNumericValue()

Converts a specified numeric Unicode character to a double-precision floating-point number.

GetTypeCode()

GetUnicodeCategory()

IsControl()

Indicates whether a specified Unicode character is categorized as a control character.

IsDigit()

Indicates whether a Unicode character is categorized as a decimal digit.

IsHighSurrogate()

Indicates whether the specified Char object is a high surrogate.

IsLetter()

Indicates whether a Unicode character is categorized as a Unicode letter.

IsLetterOrDigit()

Indicates whether a Unicode character is categorized as a letter or a decimal digit.

IsLower()

Indicates whether a Unicode character is categorized as a lowercase letter.

IsLowSurrogate()

Indicates whether the specified Char object is a low surrogate.

IsNumber()

Indicates whether a Unicode character is categorized as a number.

IsPunctuation()

Indicates whether a Unicode character is categorized as a punctuation mark.

IsSeparator()

Indicates whether a Unicode character is categorized as a separator character.

IsSurrogate()

Indicates whether a character has a surrogate code unit.

IsSurrogatePair()

Indicates whether two specified Char objects form a surrogate pair.

IsSymbol()

Indicates whether a Unicode character is categorized as a symbol character.

IsUpper()

Indicates whether a Unicode character is categorized as an uppercase letter.

IsWhiteSpace()

Indicates whether a Unicode character is categorized as white space.

Parse(String)

Converts the value of the specified string to its equivalent Unicode character.

ToLower()

Converts the value of a Unicode character to its lowercase equivalent.

ToLowerInvariant(Char)

Converts the value of a Unicode character to lowercase equivalent using the casing rules of the invariant culture.

ToString()

Converts the value of this instance to its equivalent string representation.

ToUpper()

ToUpperInvariant(Char)

Converts the value of a Unicode character to its uppercase equivalent using the casing rules of the invariant culture.

TryParse(String, Char)

Converts the value of the specified string to its equivalent Unicode character. A return code indicates whether the conversion succeeded or failed.

Example 1: Using Char.CompareTo()

// C# program to demonstrate the 
// Char.CompareTo(Char) Method 
using System; 

class Geeks
{ 
	public static void Main() 
	{ 
		char c1 = 'G'; 
		char c2 = 'f'; 
		char c3 = 'M'; 

		// using Char.CompareTo(Char) Method 
		// returns 0 as this instance has 
		// same position in the sort as in c1 
		Console.WriteLine('G'.CompareTo(c1)); 

		// returns -31 as this instance 
		// precedes c2 
		Console.WriteLine('G'.CompareTo(c2)); 

		// returns -6 as this instance follows 
		// c3 
		Console.WriteLine('G'.CompareTo(c3)); 
	} 
} 

Example 2: Using Char.IsWhiteSpace()

// C# program to illustrate the 
// Char.IsWhiteSpace(Char) Method 
using System; 

class Geeks
{ 
	static public void Main() 
	{ 

		// Declaration of data type 
		bool output; 

		// checking if space 
		// is a whitespace 
		char c1 = ' '; 
		output = Char.IsWhiteSpace(c1); 
		Console.WriteLine(output); 

		// checking if carriage return 
		// is a whitespace 
		char c2 = '\n'; 
		output = Char.IsWhiteSpace(c2); 
		Console.WriteLine(output); 

		// checking if hyphen 
		// is a whitespace 
		char c3 = '-'; 
		output = Char.IsWhiteSpace(c3); 
		Console.WriteLine(output); 
	} 
} 

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