differs in levels of indirection from 'int ()' (C)

Question

This code is giving me this error, which I don't understand. I can't even run the program. Can you help me to fix this error, please? If you don't understand anything in the code, say it.

error C2040: 'CancelarPedido' : 'ppedido (ppedido)' differs in levels of indirection from 'int ()'

printf("\nIntroduza opcao:");
    scanf("%d",&opc);

    switch(opc){
        case 1: lista = NovoPedido(lista);break;
        case 2: lista = CancelarPedido(lista);break;
        case 3: printf("Falta implementar a funcao.");break;
        case 4: printf("Falta implementar a funcao.");break;
    }
    }while(opc!=5);

    return lista;
}


ppedido CancelarPedido(ppedido lista)
{
    ppedido actual, anterior = NULL;

    char id[5];

    actual = lista;

    if(lista == NULL)
        printf("\nNao ha pedidos na fila de espera...");
    else
    {
        printf("\nIntroduza o ID do pedido que pretende cancelar: ");
        scanf("%s", id);

        while(actual != NULL && ((strcmp(actual->id, id)) != 0)){
            anterior = actual;
            actual = actual->prox;
        }
        if(actual == NULL){
            printf("\nERRO - Nao existe nenhum pedido com o ID introduzido.");
            return lista;
        }
        if(anterior == NULL){
            lista = actual->prox;
            printf("\nPedido cancelado com sucesso...");
        }
        else{
            anterior->prox = actual->prox;
            printf("\nPedido cancelado com sucesso...");
        }
        free(actual);
        return lista;
    }
}

What data type is the first piece of your code declared to return? — Etheryte, Jun 23 '12 at 04:32
typedef struct pedido pedido, *ppedido; struct pedido{ char id[5]; int prioridade; int mesa, n_pratos; struct prato *prato[TAM]; ppedido prox; }; struct prato{ char id[5]; }; — Marco, Jun 23 '12 at 04:36
Difficult to answer properly without an [SSCCE](http://www.sscce.org/). — DCoder, Jun 23 '12 at 04:37
I have struct on a "header file" with a pointer to it, the ppedido. Then declare the list in the main function, and sent to another file where is this code that I present. The problem is that I can as well send the list of function to function, but when I call this function, the program shows me this error. I have no idea why. — Marco, Jun 23 '12 at 04:43
Try reading my answer and then you will have an idea why. Without a declaration of CancelarPedido in scope, it defaults to int CancelarPedido() — Jim Balter, Jun 23 '12 at 04:46
Lessons in understanding code: The code refers to a pedido, which is Portuguese for "order" (and there are functions for new order and cancel order). ppedido is obviously a pointer to a struct that represents an order. — Jim Balter, Jun 23 '12 at 04:53

Jim Balter · Accepted Answer · 2012-06-23T04:49:40.047

9

You are calling CancelarPedido before you declared it. You need to reorder the code or add a forward declaration for CancelarPedido.

Without a declaration of CancelarPedido in scope, it defaults to int CancelarPedido(). You get the error message because lista is declared to be a pointer but CancelarPedido is declared to return an int.

edited Jun 23 '12 at 04:49

answered Jun 23 '12 at 04:32

Jim Balter

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Could be predeclared earlier in the code, we only have a fragment of the code. Talking of which, it would be more easy to help if we saw more code. – Etheryte Jun 23 '12 at 04:33
@Nit Um, if it were predeclared then we wouldn't see that error message. – Jim Balter Jun 23 '12 at 04:41
So how do I declare in order to return a list? Thank's one more time. – Marco Jun 23 '12 at 04:56
I'm not clear on your question. You have declared CancelarPedido as returning a ppedido, which is how your lista is declared, right? So the only problem is that there's no declaration of CancelarPedido in scope when you call it. You can add `ppedido CancelarPedido(ppedido lista);` to your header file. – Jim Balter Jun 23 '12 at 05:00

differs in levels of indirection from 'int ()' (C)

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