isxdigit

测试一个元素在区域设置是否使用的字符表示十六进制数字。

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

参数

• _Ch
  要测试的元素。

• _Loc
  包含元素的区域设置是测试。

返回值

true，如果测试的组件是用于的字符表示十六进制数字; false，如果未启用。

备注

模板函数返回 use_facet<ctype< CharType> > (_Loc)。是(ctype<CharType>::xdigit，_Ch)。

十六进制数字使用基础16表示数字，使用0到9正不区分大小写的字母表示十进制数的A到F 0到15。

示例

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

using namespace std;

int main( )   
{
   locale loc ( "German_Germany" );
   bool result1 = isxdigit ( '5', loc );
   bool result2 = isxdigit ( 'd', loc );
   bool result3 = isxdigit ( 'q', loc );

   if ( result1 )
      cout << "The character '5' in the locale is "
           << "a hexidecimal digit-character." << endl;
   else
      cout << "The character '5' in the locale is "
           << " not a hexidecimal digit-character." << endl;

   if ( result2 )
      cout << "The character 'd' in the locale is "
           << "a hexidecimal digit-character." << endl;
   else
      cout << "The character 'd' in the locale is "
           << " not a hexidecimal digit-character." << endl;

   if ( result3 )
      cout << "The character 'q' in the locale is "
           << "a hexidecimal digit-character." << endl;
   else
      cout << "The character 'q' in the locale is "
           << " not a hexidecimal digit-character." << endl;
}

Output

The character '5' in the locale is a hexidecimal digit-character.
The character 'd' in the locale is a hexidecimal digit-character.
The character 'q' in the locale is  not a hexidecimal digit-character.

要求

标头: <locale>

命名空间: std