isdigit

Teste si un élément dans des paramètres régionaux est un chiffre.

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

Paramètres

• _Ch
  l'élément à tester.

• _Loc
  Les paramètres régionaux qui contient l'élément à tester.

Valeur de retour

true si l'élément testé est un chiffre ; false s'il n'est pas.

Notes

La fonction de modèle retourne use_facet<ctype<CharType> >(_Loc).is(ctype<CharType>::digit, _Ch).

Exemple

// 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;
}

Sortie

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.

Configuration requise

en-tête : <locale>

l'espace de noms : DST