为什么错误struct FILE *但是参数是char *类型？

I was wondering why I'm getting the error "expected struct FILE* but argument is of type char*"? Is it because I'm passing in a type(string) instead of a type (FILE)? I plan to change the variable char *file_name to FILE *file_name, but what would I do with the %s in scanf?I was wondering why I'm getting the error "expe