C# - Char Struct

Last Updated : 04 Feb, 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.

Fields

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);
       
    }
}

Output

H h

Methods

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()	Converts the value of a UTF-16 encoded surrogate pair into a Unicode code point.
Equals()	Returns a value that indicates whether this instance is equal to a specified object or Char value.
GetHashCode()	Returns the hash code for this instance.
GetNumericValue()	Converts a specified numeric Unicode character to a double-precision floating-point number.
GetTypeCode()	Returns the TypeCode for value type Char.
GetUnicodeCategory()	Categorizes a Unicode character into a group identified by one of the UnicodeCategory values.
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()	Converts the value of a Unicode character to its uppercase equivalent.
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)); 
	} 
}

Output

0
-31
-6

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); 
	} 
}

Output

True
True
False

C# | Char.CompareTo() Method

ankita_saini

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C# - Char Struct

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