typedef struct{
int Chave;
}TipoItem;
typedef struct TipoCelula *TipoApontador;// Maior dúvida
typedef struct TipoCelula{
TipoItem Item;
TipoApontador Prox;
}TipoCelula;
typedef struct TipoLista{
TipoApontador Primeiro, Ultimo;
}TipoLista;
I could not understand mainly the commented line, because from what I understood it defined a pointer that points to a struct Type Cell that had not even been created!
What is the problem with using a type that has not yet been defined? You do not need the definition of it, it only exists. You can not use it before the setting when the use depends on the setting, in this case only needs the name.
Let's make it clearer what you're doing:
typedef (struct TipoCelula *) TipoApontador;
So this line is creating a new type called TipoApontador . This type will be a pointer to a TipoCelula structure.
When you are using:
TipoApontador Prox;
You're actually doing it:
struct TipoCelula *Prox;