request for Member 'attributeOuDecisao' in Something not a Structure or Union

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Tree initialization error, the problem with the 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;
}
c pointer struct operators

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1 answer

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When using a pointer to a structure the correct operator to access the members is always the ->. In addition whole types should 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();
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

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