当我输入一个字符时，getch 返回 2 个字符

When I use getch, it always appends the caracter read with a null character.

当我使用以下代码时:

#include "stdafx.h"
#include <conio.h>

int main()
{
    char c = 0;

    while (c != 'x')
    {
        c = _getch();
        printf("Char read: <%c> 
", c);
    }
}

当我按下asdx"键时，它会在控制台上返回以下内容:

Char read: <a>
Char read: < >
Char read: <s>
Char read: < >
Char read: <d>
Char read: < >
Char read: <x>