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Estrutura de dados


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Bom dia a todos, sou novo em estrutura de dados e gostaria de saber qual a saída para esse código

Desde já agraço.

typedef struct NO{

int dado;

NO* prox;

}NO;

typedef struct FILA{

NO* inicio;

NO* fim; } FILA;

FILA *f;

void enfileira(int valor){

NO* ptr = (NO *) malloc(sizeof(NO));

ptr->dado = valor;

ptr->prox = NULL;

if(f->inicio == NULL)

f->inicio = ptr;

else f->fim->prox = ptr;

f->fim = ptr;

}

int desenfileira(){

NO* ptr = f->inicio;

int dado;

if(ptr != NULL)

{ f->inicio = ptr->prox;

ptr->prox = NULL;

dado = ptr->dado;

free(ptr);

return dado; } }

int main(){

f = (FILA *) malloc(sizeof(FILA));

f->inicio = NULL;

f->fim = NULL;

enfileira(10);

enfileira(30);

enfileira(50);

desenfileira();

enfileira(14);

}

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