isalpha

測試一個項目中的地區設定是一個字母字元。

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

參數

• _Ch
  要測試的項目。

• _Loc
  含有字母之項目的地區設定要測試的。

傳回值

true ，如果測試的項目依字母順序排列， false ，否則會傳回。

備註

樣板函式傳回 use_facet<ctype<CharType> > (_Loc)。是(ctype<CharType>::alpha， _Ch)。

範例

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

using namespace std;

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

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

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

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

Output

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

需求

標題: <locale>

命名空間: std