c++ - c/c++ size为0时strncmp的返回值是多少

Question

c/c++ strncmp 签名如下：

int strncmp ( const char * str1, const char * str2, size_t num );

我的问题是如果 num 为 0，返回值是多少？标准怎么说？不要从一些在线文档中找到答案。

谢谢。

Answer 1

Well, strncmp compares at most num characters from the two strings, so with num == 0, it compares none, hence finds no difference, thus it returns 0.