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Ponteiros, Pilha


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Olá Pessoal segue o seguinte código. Na linha p->topo = (pilha*)n;, está dando o seguinte erro: assignment from incompatible pointer type . Esse mesmo erro estava dando na linha anterior n->prox = (no*)p->topo; que eu resolvi com o casting (no*). Mas na liha 27 mencionada anteriormente isso não resolveu. ALguém pode explicar? Obrigado.

#include <stdio.h>
#include <stdlib.h>

struct No
{
    int info;
    struct No* prox;
};
typedef struct No no;

struct Pilha
{
    struct no* topo;
};
typedef struct Pilha pilha;

pilha* cria(){
        pilha* p = (pilha*)malloc(sizeof(pilha));
        p->topo = NULL;
        return p;
}

pilha* empilhar(pilha* p, int v){
        no* n = (no*)malloc(sizeof(no));
        n->info = v;
        n->prox = (no*)p->topo;
        p->topo = (pilha*)n;
        return p;
}

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