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Q&A constructor in C

The warnings just say that you can't pass a string literal with type char[] to a function taking a struct Book* parameter. The function should be declared as: void init_Book_types (const char* tit...

posted 2y ago by Lundin‭  ·  edited 2y ago by Lundin‭

Answer
#2: Post edited by user avatar Lundin‭ · 2021-07-01T10:44:53Z (over 2 years ago)
  • The warnings just say that you can't pass a string literal with type `char[]` to a function taking a `struct Book*` parameter. The function should be declared as:
  • void init_Book_types (const char* title, const char* author, int pages);
  • And in the constructor, `aTitle` needs to be `aTitle->title` when you call `printf`
  • General advise when dealing with compiler messages is to deal with them one at a time. Fix the first on in the list, re-compile, then fix the next.
  • However, this is not how you do proper OO in C. You can do it, but it is somewhat cumbersome. Since you are a beginner, I'd simply advise to stay clear of OO for now. If you are curious still, there's some example [here](https://stackoverflow.com/questions/3824329/partitioning-struct-into-private-and-public-sections).
  • The warnings just say that you can't pass a string literal with type `char[]` to a function taking a `struct Book*` parameter. The function should be declared as:
  • void init_Book_types (const char* title, const char* author, int pages);
  • And in the constructor, `aTitle` needs to be `aTitle->title` when you call `printf`.
  • All string assignments have to be carried out with `strcpy` since C doesn't have a string class.
  • General advise when dealing with compiler messages is to deal with them one at a time. Fix the first on in the list, re-compile, then fix the next.
  • However, this is not how you do proper OO in C. You can do it, but it is somewhat cumbersome. Since you are a beginner, I'd simply advise to stay clear of OO for now. If you are curious still, there's some example [here](https://stackoverflow.com/questions/3824329/partitioning-struct-into-private-and-public-sections).
#1: Initial revision by user avatar Lundin‭ · 2021-07-01T06:18:07Z (over 2 years ago)
The warnings just say that you can't pass a string literal with type `char[]` to a function taking a `struct Book*` parameter. The function should be declared as:

    void init_Book_types (const char* title, const char* author, int pages);

And in the constructor, `aTitle` needs to be `aTitle->title` when you call `printf`

General advise when dealing with compiler messages is to deal with them one at a time. Fix the first on in the list, re-compile, then fix the next.


However, this is not how you do proper OO in C. You can do it, but it is somewhat cumbersome. Since you are a beginner, I'd simply advise to stay clear of OO for now. If you are curious still, there's some example [here](https://stackoverflow.com/questions/3824329/partitioning-struct-into-private-and-public-sections).