This documentation is archived and is not being maintained.

Char.IsDigit Method (Char)

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

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

static bool IsDigit (
	wchar_t c
public static boolean IsDigit (
	char c
public static function IsDigit (
	c : char
) : boolean
Not applicable.



A Unicode character.

Return Value

true if c is a decimal digit; otherwise, false.

This method determines if a Char is a radix-10 digit. This contrasts with IsNumber which determines if a Char is of any numeric Unicode category.

Valid digits are members of the following category in UnicodeCategory: DecimalDigitNumber.

The following code example demonstrates IsDigit.

using namespace System;
int main()
   char ch = '8';
   Console::WriteLine( Char::IsDigit( ch ) ); // Output: "True"
   Console::WriteLine( Char::IsDigit(  "sample string", 7 ) ); // Output: "False"

import System.* ;

public class IsDigitSample
    public static void main(String[] args)
        char ch = '8';
        Console.WriteLine(Char.IsDigit(ch));                // Output: "True"
        Console.WriteLine(Char.IsDigit("sample string", 7));// Output: "False"
    } //main
} //IsDigitSample

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0