Incompatible types when initializing type error

Question

I'm facing problems with pointers and structures in C. Let's say:

typedef struct mdata{
   int a;
   int b;
    ...
} pred_data_attr;

typedef struct mConfig{
   pred_data_attr mdata;
   ...
} mConfig;

struct control{
   struct mConfig mcfg;
   ...
};

INT32 rdfapp(struct control *rdf){
    pred_data_attr* mdata = rdf->mcfg.mdata;
    ...
}

I got this error:

incompatible types when initializing type 'struct pred_data_attr *' using type 'pred_data_attr'

How can I fix this problem?

Answer 1

What about:

INT32 rdfapp(struct control *rdf)
{
  pred_data_attr * mdata = &rdf->mcfg.mdata;

---

The namings in your code are another good example how inappropriate naming can lead to irritations and errors.

It is not a good idea to name different things the same:

pred_data_attr * mdata /* here mdata is a pointer */

pred_data_attr mdata; /* here mdata is the instance of a structure */

There are plenty of possiblilites how naming can be setup, from which I do not want to recommend any here as it's primarily about:

Give different names to different things.