isalnum

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

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

Parameters

• _Ch
  The alphanumeric element to be tested.

• _Loc
  The locale containing the alphanumeric element to be tested.

Return Value

true if the element tested is alphanumeric; false if it is not.

Example

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

using namespace std;

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

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

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

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

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

Requirements

Header: <locale>

Namespace: std