strrchr

问题 The function char* strrchr(const char *str, int ch) returns a pointer ( char* ) within str ( const char * ) where the last occurrence of ch is located. So we can write the following code without any cast: #include <string.h> int main() { const char CONSTSTR[] = "foo/bar/foobar.txt"; char *ptr = strrchr (CONSTSTR, '/'); *ptr++ = 'B'; *ptr++ = 'A'; *ptr++ = 'D'; } What is the advantage to return char* instead of const char* ? EDIT: As a Shafik Yaghmour pointed out, there are very good answers

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I would like to know the difference between the two different uses. I believe the difference in some what very subtle. This is an