如何用C来比较十六进制值？ [英] How to compare hex values using C?

问题描述

我与十六进制值工作。到现在为止，我知道如何打印十六进制值，也precision的事情。现在我要比较的十六进制值。例如我从文件中读取数据到一个字符缓冲区。现在我想数据的十六进制值比较缓冲区。是否有这样的事？

I am working with hex values. Until now I know how to print hex values and also precision thing. Now I want to compare the hex values. For example I am reading data from a file into a char buffer. Now I want to compare the hex value of data in the buffer. Is there anything like this?

if  hex(buffer[i]) > 0X3F  
then
//do somthing

我怎样才能做到这一点？

How can I do this?

推荐答案

您快到了：

if (buffer[i] > 0x3f)
{
    // do something
}

请注意，没有必要转换任何六角 - 你可以直接比较字符或整数值，因为一个十六进制常量如0x3F的是另一种psenting一个整数值，再$ P $的方式。 0x3F的== 63（十进制）== ASCII？。

Note that there is no need to "convert" anything to hex - you can just compare character or integer values directly, since a hex constant such as 0x3f is just another way of representing an integer value. 0x3f == 63 (decimal) == ASCII '?'.

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