这是什么意思是＆QUOT;由零＆QUOT;？终止 [英] What does it mean to be "terminated by a zero"?

问题描述

我进入C / C ++和大量的术语如雨后春笋般冒出生疏了。其中之一是由一零终止的变量或指针。这是什么意思在内存空间由一个零终止？

I am getting into C/C++ and a lot of terms are popping up unfamiliar to me. One of them is a variable or pointer that is terminated by a zero. What does it mean for a space in memory to be terminated by a zero?

推荐答案

参加ASCII字符串你好。在内存最简单的重新presentation是两个字节：

Take the string Hi in ASCII. Its simplest representation in memory is two bytes:

0x48
0x69

但是，这是否一块内存结束？除非你也$ ppared通过串绕中的字节数p $，你不知道 - 内存条没有本质上的长度

But where does that piece of memory end? Unless you're also prepared to pass around the number of bytes in the string, you don't know - pieces of memory don't intrinsically have a length.

所以C有一个标准的字符串以零字节，也称为 NUL 字符结尾：

So C has a standard that strings end with a zero byte, also known as a NUL character:

0x48
0x69
0x00

该字符串现在是明确长两个字符，因为有两个字符前 NUL 。

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