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CharUnicodeInfo::GetNumericValue Method (Char)

 

Gets the numeric value associated with the specified character.

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

public:
static double GetNumericValue(
	wchar_t ch
)

Parameters

ch
Type: System::Char

The Unicode character for which to get the numeric value.

Return Value

Type: System::Double

The numeric value associated with the specified character.

-or-

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

Numeric value is a Unicode character property that applies only to numeric characters, which include fractions, subscripts, superscripts, Roman numerals, currency numerators, encircled numbers, and script-specific digits. For more information on Unicode characters, see the Unicode Standard.

The GetNumericValue(Char) method assumes that ch corresponds to a single linguistic character and checks whether that character can be converted to a decimal digit. However, some numbers in the Unicode standard are represented by two Char objects that form a surrogate pair. For example, the Aegean numbering system consists of code points U+10107 through U+10133. The following example uses the ConvertFromUtf32 method to instantiate a string that represents AEGEAN NUMBER ONE. As the output from the example shows, the GetNumericValue(Char) method returns -1 if it is passed either a high surrogate or a low surrogate of this character.

No code example is currently available or this language may not be supported.

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       \u0393   -1    -1    -1   UppercaseLetter
U+0039 DIGIT NINE                       9   9     9     9    DecimalDigitNumber
U+00B2 SUPERSCRIPT TWO                  \u00B2   2     2     2    OtherNumber
U+00BC VULGAR FRACTION ONE QUARTER      \u00BC   0.25  -1    -1   OtherNumber
U+0BEF TAMIL DIGIT NINE                 \u0BEF   9     9     9    DecimalDigitNumber
U+0BF0 TAMIL NUMBER TEN                 \u0BF0   10    -1    -1   OtherNumber
U+0F33 TIBETAN DIGIT HALF ZERO          \u0F33   -0.5  -1    -1   OtherNumber
U+2788 CIRCLED SANS-SERIF DIGIT NINE    \u2788   9     9     -1   OtherNumber

*/

Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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