C ++中字符串文字的数据类型是什么? [英] What is the datatype of string literal in C++?

问题描述

我对字符串文字的数据类型感到困惑.是const char *还是const char?

I'm confused about the datatype of a string literal. Is it a const char * or a const char?

推荐答案

它是一个const char[N](与char const[N]是相同的东西)，其中N是字符串加上一个终止符NUL的字符串(如果您已经定义了字符串的长度"(已经包括NUL)，则为字符串的长度).

It is a const char[N] (which is the same thing as char const[N]), where N is the length of the string plus one for the terminating NUL (or just the length of the string if you define "length of a string" as already including the NUL).

这就是为什么您可以执行sizeof("hello") - 1获取字符串中的字符数的原因(包括任何嵌入的NUL)；如果它是一个指针，它将不起作用，因为它始终是系统上指针的大小(减一).

This is why you can do sizeof("hello") - 1 to get the number of characters in the string (including any embedded NULs); if it was a pointer, it wouldn't work because it would always be the size of pointer on your system (minus one).

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