isdigit

測試一個項目中的地區設定是一個數字字元。

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

參數

• _Ch
  要測試的項目。

• _Loc
  包含項目的地區設定要測試的。

傳回值

true ，如果測試的項目是數字字元， false ，否則會傳回。

備註

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

範例

// 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;
}

Output

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.

需求

標題: <locale>

命名空間: std