isalnum

測試一個項目中的地區設定是否是依字母順序或一個數字字元。

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

參數

• _Ch
  要測試的原始程式碼檔中的項目。

• _Loc
  包含英數字元的項目的地區設定要測試的。

傳回值

true ，如果測試的項目是英數字; false ，否則會傳回。

範例

// 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;
}

需求

標題: <locale>

命名空間: std