Chained list, union of structures

Question

I have some difficulty in uniting two structures in the same chained list, I have never worked with generic lists or even associated in one activity two structures, I have the following structures:

struct Patio {
    char iden_patio;
    int capacidade;
    struct Patio *prox;
};  

typedef struct Patio patio;

struct Rec_Emp {    
    char nome_rec[10];
    char ident_rec[10];
    int uso_rec;
    int taxa_rec;
    struct Rec_Emp *prox;
};    

typedef struct Rec_Emp recuperadora;

I wanted to associate these two lists without necessarily uniting all the variables, more or less like this, for each patio, associate the elements of the recuperaras, ex: iden_patio: A, capacity: 10000, nome_rec: Rec01, uso_rec: 0, etc... As I said could even unite the two, form a larger struct, but I would like a more elegant solution, because I wanted to preserve the identities of the patios and recuperaras, I thank you attention from now.

Answer 1

With the information I have about your problem I can already give you two answers.

Taking into account that you need to know which recuperators are associated with a patio, I recommend doing so:

#define RECS_PATIO 2

struct Rec_Emp {
    char nome_rec[10];
    char ident_rec[10];
    int uso_rec;
    int taxa_rec;
    struct Rec_Emp *prox;
};

typedef struct Rec_Emp recuperadora;

struct Patio {
    char iden_patio;
    int capacidade;
    struct Patio *prox;
    struct Rec_Emp *lista[RECS_PATIO];
}; 

typedef struct Patio patio;

Using the above structures, let’s assume that you want to associate a recuperator to a patio p and then print some value of the recuperator accessing through the patio. Do it like this:

p.lista[0] = &r;
int resp = 0;
resp = p.lista[0]->uso_rec; // Acessando uso_rec da recuperadora pela variável do pátio

Taking into account that you need to know which patio is associated with a recuperator, I recommend doing so:

struct Patio {
    char iden_patio;
    int capacidade;
    struct Patio *prox;
}; 

typedef struct Patio patio;

struct Rec_Emp {
    char nome_rec[10];
    char ident_rec[10];
    int uso_rec;
    int taxa_rec;
    struct Rec_Emp *prox;
    struct Patio *p;
};

typedef struct Rec_Emp recuperadora;

Using the code above, let’s assume that you want to associate a patio p with a recuperator and then print some yard value accessing by the recuperator. Do it like this:

r.p = &p;
int resp = 0;
resp = r.p->capacidade;

I hope you’ve cleared up your doubts, anything I’m up for.

Reference: My knowledge in AED’s.