isdigit
测试一个元素来包装区域设置是一个数字字符。
template<Class CharType>
bool isdigit(
CharType _Ch,
const locale& _Loc
)
参数
_Ch
元素是测试。_Loc
包含元素的区域设置进行测试。
返回值
true,则测试的元素是一种数字字符;false,则不是。
备注
模板函数 use_facet<ctype<返回CharType> >(_Loc)。是(ctype<CharType>或digit,_Ch)。
示例
// 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.
要求
页眉: <区域设置>
命名空间: std