CharUnicodeInfo.GetDigitValue Method

Definition

Gets the digit value of a numeric Unicode character.

Overloads

GetDigitValue(Char)

Gets the digit value of the specified numeric character.

GetDigitValue(String, Int32)

Gets the digit value of the numeric character at the specified index of the specified string.

GetDigitValue(Char)

Gets the digit value of the specified numeric character.

public:
 static int GetDigitValue(char ch);
public static int GetDigitValue (char ch);
static member GetDigitValue : char -> int
Public Shared Function GetDigitValue (ch As Char) As Integer

Parameters

ch
Char

The Unicode character for which to get the digit value.

Returns

The digit value of the specified numeric character.

-or-

-1, if the specified character is not a digit.

Examples

The following code example shows the values returned by each method for different types of characters.

using namespace System;
using namespace System::Globalization;
void PrintProperties( Char c );
int main()
{
   Console::WriteLine( "                                        c  Num   Dig   Dec   UnicodeCategory" );
   Console::Write( "U+0061 LATIN SMALL LETTER A            " );
   PrintProperties( L'a' );
   Console::Write( "U+0393 GREEK CAPITAL LETTER GAMMA      " );
   PrintProperties( L'\u0393' );
   Console::Write( "U+0039 DIGIT NINE                      " );
   PrintProperties( L'9' );
   Console::Write( "U+00B2 SUPERSCRIPT TWO                 " );
   PrintProperties( L'\u00B2' );
   Console::Write( "U+00BC VULGAR FRACTION ONE QUARTER     " );
   PrintProperties( L'\u00BC' );
   Console::Write( "U+0BEF TAMIL DIGIT NINE                " );
   PrintProperties( L'\u0BEF' );
   Console::Write( "U+0BF0 TAMIL NUMBER TEN                " );
   PrintProperties( L'\u0BF0' );
   Console::Write( "U+0F33 TIBETAN DIGIT HALF ZERO         " );
   PrintProperties( L'\u0F33' );
   Console::Write( "U+2788 CIRCLED SANS-SERIF DIGIT NINE   " );
   PrintProperties( L'\u2788' );
}

void PrintProperties( Char c )
{
   Console::Write( " {0,-3}", c );
   Console::Write( " {0,-5}", CharUnicodeInfo::GetNumericValue( c ) );
   Console::Write( " {0,-5}", CharUnicodeInfo::GetDigitValue( c ) );
   Console::Write( " {0,-5}", CharUnicodeInfo::GetDecimalDigitValue( c ) );
   Console::WriteLine( "{0}", CharUnicodeInfo::GetUnicodeCategory( c ) );
}

/*
This code produces the following output.  Some characters might not display at the console.

                                        c  Num   Dig   Dec   UnicodeCategory
U+0061 LATIN SMALL LETTER A             a   -1    -1    -1   LowercaseLetter
U+0393 GREEK CAPITAL LETTER GAMMA       Γ   -1    -1    -1   UppercaseLetter
U+0039 DIGIT NINE                       9   9     9     9    DecimalDigitNumber
U+00B2 SUPERSCRIPT TWO                  ²   2     2     -1   OtherNumber
U+00BC VULGAR FRACTION ONE QUARTER      ¼   0.25  -1    -1   OtherNumber
U+0BEF TAMIL DIGIT NINE                 ௯   9     9     9    DecimalDigitNumber
U+0BF0 TAMIL NUMBER TEN                 ௰   10    -1    -1   OtherNumber
U+0F33 TIBETAN DIGIT HALF ZERO          ༳   -0.5  -1    -1   OtherNumber
U+2788 CIRCLED SANS-SERIF DIGIT NINE    ➈   9     9     -1   OtherNumber

*/
using System;
using System.Globalization;

public class SamplesCharUnicodeInfo  {

   public static void Main()  {

      Console.WriteLine( "                                        c  Num   Dig   Dec   UnicodeCategory" );

      Console.Write( "U+0061 LATIN SMALL LETTER A            " );
      PrintProperties( 'a' );

      Console.Write( "U+0393 GREEK CAPITAL LETTER GAMMA      " );
      PrintProperties( '\u0393' );

      Console.Write( "U+0039 DIGIT NINE                      " );
      PrintProperties( '9' );

      Console.Write( "U+00B2 SUPERSCRIPT TWO                 " );
      PrintProperties( '\u00B2' );

      Console.Write( "U+00BC VULGAR FRACTION ONE QUARTER     " );
      PrintProperties( '\u00BC' );

      Console.Write( "U+0BEF TAMIL DIGIT NINE                " );
      PrintProperties( '\u0BEF' );

      Console.Write( "U+0BF0 TAMIL NUMBER TEN                " );
      PrintProperties( '\u0BF0' );

      Console.Write( "U+0F33 TIBETAN DIGIT HALF ZERO         " );
      PrintProperties( '\u0F33' );

      Console.Write( "U+2788 CIRCLED SANS-SERIF DIGIT NINE   " );
      PrintProperties( '\u2788' );
   }

   public static void PrintProperties( char c )  {
      Console.Write( " {0,-3}", c );
      Console.Write( " {0,-5}", CharUnicodeInfo.GetNumericValue( c ) );
      Console.Write( " {0,-5}", CharUnicodeInfo.GetDigitValue( c ) );
      Console.Write( " {0,-5}", CharUnicodeInfo.GetDecimalDigitValue( c ) );
      Console.WriteLine( "{0}", CharUnicodeInfo.GetUnicodeCategory( c ) );
   }
}


/*
This code produces the following output.  Some characters might not display at the console.

                                        c  Num   Dig   Dec   UnicodeCategory
U+0061 LATIN SMALL LETTER A             a   -1    -1    -1   LowercaseLetter
U+0393 GREEK CAPITAL LETTER GAMMA       Γ   -1    -1    -1   UppercaseLetter
U+0039 DIGIT NINE                       9   9     9     9    DecimalDigitNumber
U+00B2 SUPERSCRIPT TWO                  ²   2     2     -1   OtherNumber
U+00BC VULGAR FRACTION ONE QUARTER      ¼   0.25  -1    -1   OtherNumber
U+0BEF TAMIL DIGIT NINE                 ௯   9     9     9    DecimalDigitNumber
U+0BF0 TAMIL NUMBER TEN                 ௰   10    -1    -1   OtherNumber
U+0F33 TIBETAN DIGIT HALF ZERO          ༳   -0.5  -1    -1   OtherNumber
U+2788 CIRCLED SANS-SERIF DIGIT NINE    ➈   9     9     -1   OtherNumber

*/
Imports System.Globalization

Public Class SamplesCharUnicodeInfo

   Public Shared Sub Main()

      Console.WriteLine("                                        c  Num   Dig   Dec   UnicodeCategory")

      Console.Write("U+0061 LATIN SMALL LETTER A            ")
      PrintProperties("a"c)

      Console.Write("U+0393 GREEK CAPITAL LETTER GAMMA      ")
      PrintProperties(ChrW(&H0393))

      Console.Write("U+0039 DIGIT NINE                      ")
      PrintProperties("9"c)

      Console.Write("U+00B2 SUPERSCRIPT TWO                 ")
      PrintProperties(ChrW(&H00B2))

      Console.Write("U+00BC VULGAR FRACTION ONE QUARTER     ")
      PrintProperties(ChrW(&H00BC))

      Console.Write("U+0BEF TAMIL DIGIT NINE                ")
      PrintProperties(ChrW(&H0BEF))

      Console.Write("U+0BF0 TAMIL NUMBER TEN                ")
      PrintProperties(ChrW(&H0BF0))

      Console.Write("U+0F33 TIBETAN DIGIT HALF ZERO         ")
      PrintProperties(ChrW(&H0F33))

      Console.Write("U+2788 CIRCLED SANS-SERIF DIGIT NINE   ")
      PrintProperties(ChrW(&H2788))

   End Sub

   Public Shared Sub PrintProperties(c As Char)
      Console.Write(" {0,-3}", c)
      Console.Write(" {0,-5}", CharUnicodeInfo.GetNumericValue(c))
      Console.Write(" {0,-5}", CharUnicodeInfo.GetDigitValue(c))
      Console.Write(" {0,-5}", CharUnicodeInfo.GetDecimalDigitValue(c))
      Console.WriteLine("{0}", CharUnicodeInfo.GetUnicodeCategory(c))
   End Sub

End Class


'This code produces the following output.  Some characters might not display at the console.
'
'                                        c  Num   Dig   Dec   UnicodeCategory
'U+0061 LATIN SMALL LETTER A             a   -1    -1    -1   LowercaseLetter
'U+0393 GREEK CAPITAL LETTER GAMMA       Γ   -1    -1    -1   UppercaseLetter
'U+0039 DIGIT NINE                       9   9     9     9    DecimalDigitNumber
'U+00B2 SUPERSCRIPT TWO                  ²   2     2     -1   OtherNumber
'U+00BC VULGAR FRACTION ONE QUARTER      ¼   0.25  -1    -1   OtherNumber
'U+0BEF TAMIL DIGIT NINE                 ௯   9     9     9    DecimalDigitNumber
'U+0BF0 TAMIL NUMBER TEN                 ௰   10    -1    -1   OtherNumber
'U+0F33 TIBETAN DIGIT HALF ZERO          ༳   -0.5  -1    -1   OtherNumber
'U+2788 CIRCLED SANS-SERIF DIGIT NINE    ➈   9     9     -1   OtherNumber

Remarks

Digit value is a property that applies only to numeric characters that can be used as digits. A digit is a numeric character that can be combined with other digits to represent a whole number in a numbering system.

For more information on Unicode characters, see the Unicode Standard.

Applies to

GetDigitValue(String, Int32)

Gets the digit value of the numeric character at the specified index of the specified string.

public:
 static int GetDigitValue(System::String ^ s, int index);
public static int GetDigitValue (string s, int index);
static member GetDigitValue : string * int -> int
Public Shared Function GetDigitValue (s As String, index As Integer) As Integer

Parameters

s
String

The String containing the Unicode character for which to get the digit value.

index
Int32

The index of the Unicode character for which to get the digit value.

Returns

The digit value of the numeric character at the specified index of the specified string.

-or-

-1, if the character at the specified index of the specified string is not a digit.

Exceptions

index is outside the range of valid indexes in s.

Examples

The following code example shows the values returned by each method for different types of characters.

using namespace System;
using namespace System::Globalization;
int main()
{

   // The String to get information for.
   String^ s = "a9\u0393\u00B2\u00BC\u0BEF\u0BF0\u2788";
   Console::WriteLine( "String: {0}", s );

   // Print the values for each of the characters in the string.
   Console::WriteLine( "index c  Num   Dig   Dec   UnicodeCategory" );
   for ( int i = 0; i < s->Length; i++ )
   {
      Console::Write( "{0,-5} {1,-3}", i, s[ i ] );
      Console::Write( " {0,-5}", CharUnicodeInfo::GetNumericValue( s, i ) );
      Console::Write( " {0,-5}", CharUnicodeInfo::GetDigitValue( s, i ) );
      Console::Write( " {0,-5}", CharUnicodeInfo::GetDecimalDigitValue( s, i ) );
      Console::WriteLine( "{0}", CharUnicodeInfo::GetUnicodeCategory( s, i ) );

   }
}

/*
This code produces the following output.  Some characters might not display at the console.

String: a9Γ²¼௯௰➈
index c  Num   Dig   Dec   UnicodeCategory
0     a   -1    -1    -1   LowercaseLetter
1     9   9     9     9    DecimalDigitNumber
2     Γ   -1    -1    -1   UppercaseLetter
3     ²   2     2     -1   OtherNumber
4     ¼   0.25  -1    -1   OtherNumber
5     ௯   9     9     9    DecimalDigitNumber
6     ௰   10    -1    -1   OtherNumber
7     ➈   9     9     -1   OtherNumber

*/
using System;
using System.Globalization;

public class SamplesCharUnicodeInfo  {

   public static void Main()  {

      // The String to get information for.
      String s = "a9\u0393\u00B2\u00BC\u0BEF\u0BF0\u2788";
      Console.WriteLine( "String: {0}", s );

      // Print the values for each of the characters in the string.
      Console.WriteLine( "index c  Num   Dig   Dec   UnicodeCategory" );
      for ( int i = 0; i < s.Length; i++ )  {
         Console.Write( "{0,-5} {1,-3}", i, s[i] );
         Console.Write( " {0,-5}", CharUnicodeInfo.GetNumericValue( s, i ) );
         Console.Write( " {0,-5}", CharUnicodeInfo.GetDigitValue( s, i ) );
         Console.Write( " {0,-5}", CharUnicodeInfo.GetDecimalDigitValue( s, i ) );
         Console.WriteLine( "{0}", CharUnicodeInfo.GetUnicodeCategory( s, i ) );
      }
   }
}


/*
This code produces the following output.  Some characters might not display at the console.

String: a9Γ²¼௯௰➈
index c  Num   Dig   Dec   UnicodeCategory
0     a   -1    -1    -1   LowercaseLetter
1     9   9     9     9    DecimalDigitNumber
2     Γ   -1    -1    -1   UppercaseLetter
3     ²   2     2     -1   OtherNumber
4     ¼   0.25  -1    -1   OtherNumber
5     ௯   9     9     9    DecimalDigitNumber
6     ௰   10    -1    -1   OtherNumber
7     ➈   9     9     -1   OtherNumber

*/
Imports System.Globalization

Public Class SamplesCharUnicodeInfo

   Public Shared Sub Main()

      ' The String to get information for.
      Dim s As [String] = "a9\u0393\u00B2\u00BC\u0BEF\u0BF0\u2788"
      Console.WriteLine("String: {0}", s)

      ' Print the values for each of the characters in the string.
      Console.WriteLine("index c  Num   Dig   Dec   UnicodeCategory")
      Dim i As Integer
      For i = 0 To s.Length - 1
         Console.Write("{0,-5} {1,-3}", i, s(i))
         Console.Write(" {0,-5}", CharUnicodeInfo.GetNumericValue(s, i))
         Console.Write(" {0,-5}", CharUnicodeInfo.GetDigitValue(s, i))
         Console.Write(" {0,-5}", CharUnicodeInfo.GetDecimalDigitValue(s, i))
         Console.WriteLine("{0}", CharUnicodeInfo.GetUnicodeCategory(s, i))
      Next i

   End Sub

End Class


'This code produces the following output.  Some characters might not display at the console.
'
'String: a9Γ²¼௯௰➈
'index c  Num   Dig   Dec   UnicodeCategory
'0     a   -1    -1    -1   LowercaseLetter
'1     9   9     9     9    DecimalDigitNumber
'2     Γ   -1    -1    -1   UppercaseLetter
'3     ²   2     2     -1   OtherNumber
'4     ¼   0.25  -1    -1   OtherNumber
'5     ௯   9     9     9    DecimalDigitNumber
'6     ௰   10    -1    -1   OtherNumber
'7     ➈   9     9     -1   OtherNumber

Remarks

Digit value is a property that applies only to numeric characters that can be used as digits. A digit is a numeric character that can be combined with other digits to represent a whole number in a numbering system.

For more information on Unicode characters, see the Unicode Standard.

Applies to