isdigit

Tests whether an element in a locale is a numeric character.

template<Class CharType> 
   bool isdigit( 
      CharType _Ch,  
      const locale& _Loc 
   )

Parameters

• _Ch
  The element to be tested.

• _Loc
  The locale containing the element to be tested.

Return Value

true if the element tested is a numeric character; false if it is not.

Remarks

The template function returns use_facet<ctype<CharType> >(_Loc).is(ctype<CharType>::digit, _Ch).

Example

// locale_is_digit.cpp
// compile with: /EHsc
#include <locale>
#include <iostream>

using namespace std;

int main( )   
{
   locale loc ( "German_Germany" );
   bool result1 = isdigit ( 'L', loc );
   bool result2 = isdigit ( '@', loc );
   bool result3 = isdigit ( '3', loc );

   if ( result1 )
      cout << "The character 'L' in the locale is "
           << "a numeric character." << endl;
   else
      cout << "The character 'L' in the locale is "
           << " not a numeric character." << endl;

   if ( result2 )
      cout << "The character '@' in the locale is "
           << "a numeric character." << endl;
   else
      cout << "The character '@' in the locale is "
           << " not a numeric character." << endl;

   if ( result3 )
      cout << "The character '3' in the locale is "
           << "a numeric character." << endl;
   else
      cout << "The character '3' in the locale is "
           << " not a numeric character." << endl;
}

Output

The character 'L' in the locale is  not a numeric character.
The character '@' in the locale is  not a numeric character.
The character '3' in the locale is a numeric character.

Requirements

Header: <locale>

Namespace: std