Tree initialization error, the problem with category variables and atributoOuDecisao .
typedef struct node {
int categoria;
int atributoOuDecisao;
struct node *prox;
struct node *lista;
} No;
No *criaArvore(void){
No *inicio = (No*)malloc(sizeof(No));
inicio.atributoOuDecisao = NULL;
inicio.categoria = NULL;
inicio->lista = NULL;
inicio->prox = NULL;
printf ("inicio criado");
return inicio;
}
When you use a pointer to a structure the correct operator to access the members is always -> . In addition, integer types must be initialized with 0 and not with NULL .
#include <stdio.h>
#include <stdlib.h>
typedef struct node {
int categoria;
int atributoOuDecisao;
struct node *prox;
struct node *lista;
} No;
No *criaArvore(void){
No *inicio = malloc(sizeof(No));
inicio->atributoOuDecisao = 0;
inicio->categoria = 0;
inicio->lista = NULL;
inicio->prox = NULL;
printf ("inicio criado");
return inicio;
}
int main() {
criaArvore();
}
See running on ideone and on CodingGround .