c++ - Check if Char is in range

Question

If I have a range of say 000080-0007FF and I want to see if a char containing hex is within that range, how can I do it?

Example

char t = 0xd790;

if (t is within range of 000080-0007FF) // true

Answer 1

wchar_t t = 0xd790;

if (t >= 0x80 && t <= 0x7ff) ...

In C++, characters are interchangeable with integers and you can compare their values directly.

Note that I used wchar_t, because the char data type can only hold values up to 0xFF.

Answer 2

unsigned short t = 0xd790;

if (t >= 0x80 && t <= 0x7ff) ...

由于 char 的最大值为 0xFF，因此您不能使用它来比较十六进制数字多于 2 的任何内容。

Answer 3

由于计算机上的十六进制只不过是一种打印数字（如十进制）的方式，因此您也可以与普通的旧基 10 整数进行比较。

if( (t >= 128) && (t <= 2047) )
{
}

更具可读性。