c++ - 又遇到了'\0' null NULL 的问题了

Question

我之前上 stackoverflow 查证过字符串的结尾是'0'-terminate啊, 如下引用. 但是今天查 string 的, 上面图片里的官方文档的说法又都变成了 null-terminated 了. 希望大家解答下, 谢谢

‘0’ terminate a string, not NULL, the NULL macro isn’t intended for use in terminating strings.----(左边包含了链接)

Answer 1

If it is a string of char*, the library function defaults to '

#include <string>
#include <iostream>

int main()
{
    std::string s = "hello";
    s[1] = 'rrreee';
    std::cout << s << std::endl;
    return 0;
}

Output: h llo

Answer 2

The so-called null-terminated in null should refer to the NUL in the ASCII character set. Its encoding is the number 0, which is '' in C language. It is essentially a char.
In C language, the NULL macro refers to a null pointer, that is, ((void*)0), which is a pointer type.
The two are different types, essentially different concepts, and have different uses.
The original post on stackoverflow that you quoted should discuss this issue.