C ++什么是字符串文字的数据类型？ [英] C++ what is the datatype of string literal?

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 ？深入了解。感谢

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

推荐答案

这是一个 const char [N] N 是的长度。 字符串加上一个用于终止 NUL （或者只是字符串的长度，如果你定义字符串的长度已经包括 NUL ）

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).

这是为什么你可以做 sizeof（hello） - 1 以获取字符串中的字符数（包括任何嵌入的 NUL s）;如果它是一个指针，它不会工作，因为它将永远是您的系统上的指针大小（减去一个）。

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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