Problem with order of list

I would like to order the list by the var distance but program will say always "Lista Vazia"

Code:

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void imprime_lista (List lista){

        int vect_distance[100];
        int vect_x[100];
        int vect_y[100];
        int distancia,posicao;
        int contador=-1;
        int i=0;
        int max=0;

        List auxiliar = cria_lista(auxiliar);
        List l = lista->next;
       
        while (l!=NULL){
                distancia=find_distance(l->info.coordenadas);
                vect_distance[i]=distancia;
                vect_x[i]=l->info.coordenadas.x;
                vect_y[i]=l->info.coordenadas.y;
                contador=contador+1;
                i=i+1;
                l=l->next;
        }

        while(vect_distance[contador]!=0){

                for(i=0;i<=contador;i++){
                       
                        if (vect_distance[i]>max){
                                max=vect_distance[i];
                                posicao=i;
                        }
                }

                while(l!=NULL){
                        if (l->info.coordenadas.x==vect_x[posicao] && l->info.coordenadas.y==vect_y[posicao]){
                                insere_lista(auxiliar,l->info);
                        }
                        l=l->next;
                }
                vect_distance[posicao]=0;
        }

        List x = auxiliar->next;
       
        if(x==NULL){
                printf("LISTA VAZIA!!");
        }
       
        while (x!=NULL){   
                printf("\nNome: %s", x->info.nome);
                printf("\nMorada: %s", x->info.morada);
                printf("\nE-Mail: %s", x->info.email);
                printf("\nTipo de Comida: %s", x->info.comida);
                printf("\nNumero de Telefone: %s", x->info.telefone);
                printf("\nObservações: %s", x->info.observacoes);
                printf("\nCoordenadas: %d,%d", x->info.coordenadas.x, x->info.coordenadas.y);
                switch (x->info.dia_descanso){
                        case 1: printf("\nDia de descanso semanal: Domingo"); break;
            case 2: printf("\nDia de descanso semanal: Segunda-Feira"); break;
            case 3: printf("\nDia de descanso semanal: Terça-Feira"); break;
            case 4: printf("\nDia de descanso semanal: Quarta-Feira"); break;
            case 5: printf("\nDia de descanso semanal: Quinta-Feira"); break;
            case 6: printf("\nDia de descanso semanal: Sexta-Feira"); break;
            case 7: printf("\nDia de descanso semanal: Sábado"); break;
            default: printf("\n\nErro na leitura do dia de descanso!\n\n"); break;
                }
                printf("\nInicio das ferias: %d/%d", x->info.inicio_ferias.dia, x->info.inicio_ferias.mes);
                printf("\nFim das ferias: %d/%d\n", x->info.fim_ferias.dia, x->info.fim_ferias.mes);
               
                x=x->next;
        }
}

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I have no idea what cria_lista is supposed to do; create a list, perhaps? So since you create an auxiliar list, and then set x to be the second element of the list that doesn't have anything in it anyway, it's not surprising that x is NULL.

cria_lista its create list, and "insere_lista" its put the actual lnode into a new list auxiliar...

Quote:

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Originally Posted by Yannick

cria_lista its create list, and "insere_lista" its put the actual lnode into a new list auxiliar...

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Except that never happens, since it's inside a while (l != NULL) loop; but we can only get to that loop after the previous loop finishes -- when l equals NULL.

i didnt understand...sorry

i dont know how to solve this...

Code:

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                while(l!=NULL){
                        if (l->info.coordenadas.x==vect_x[posicao] && l->info.coordenadas.y==vect_y[posicao]){
                                insere_lista(auxiliar,l->info);
                        }
                        l=l->next;
                }
                vect_distance[posicao]=0;

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Where do you want l to be when this while loop starts?

Before the loop i want that l is at start of the list and next to the header....what i've to do?

Quote:

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Originally Posted by Yannick

Before the loop i want that l is at start of the list and next to the header....what i've to do?

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Put it there. Assign l to the head of the list before the while loop starts.

if i put List l=lista it says that there were already a definition...

ASSIGN it, not DEFINE it.

I've changed to this...it works but if there's 3 lists he will print 3times the same list...and not an order list..."Pesquisa special list" its a search funtion with 2 key-word and returns a list...

Code:

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void imprime_lista (List lista){

        int vect_distance[100];
        int vect_x[100];
        int vect_y[100];
        int distancia,posicao;
        int contador=-1;
        int j=-1;
        int i=0;
        int max=0;

        List pesquisa = cria_lista(pesquisa);
        List auxiliar = cria_lista(auxiliar);
        List l = lista->next;
       
        while (l!=NULL){
                distancia=find_distance(l->info.coordenadas);
                vect_distance[i]=distancia;
                vect_x[i]=l->info.coordenadas.x;
                vect_y[i]=l->info.coordenadas.y;
                contador=contador+1;
                i=i+1;
                l=l->next;
        }

        List mainlist=lista->next;

        while(mainlist!=NULL){

                for(i=0;i<=contador;i++){
                       
                        if (vect_distance[i]>max){
                                max=vect_distance[i];
                                posicao=i;
                        }
                }

                pesquisa=pesquisa_lista_special(lista,vect_x[posicao],vect_y[posicao]);
                insere_lista(auxiliar,pesquisa->info);
                vect_distance[posicao]=0;
                j=j+1;
                mainlist=mainlist->next;
        }


        List x = auxiliar->next;
       
        if(x==NULL){
                printf("LISTA VAZIA!!");
        }
       
        while (x!=NULL){   
                printf("\nNome: %s", x->info.nome);
                printf("\nMorada: %s", x->info.morada);
                printf("\nE-Mail: %s", x->info.email);
                printf("\nTipo de Comida: %s", x->info.comida);
                printf("\nNumero de Telefone: %s", x->info.telefone);
                printf("\nObservações: %s", x->info.observacoes);
                printf("\nCoordenadas: %d,%d", x->info.coordenadas.x, x->info.coordenadas.y);
                switch (x->info.dia_descanso){
                        case 1: printf("\nDia de descanso semanal: Domingo"); break;
            case 2: printf("\nDia de descanso semanal: Segunda-Feira"); break;
            case 3: printf("\nDia de descanso semanal: Terça-Feira"); break;
            case 4: printf("\nDia de descanso semanal: Quarta-Feira"); break;
            case 5: printf("\nDia de descanso semanal: Quinta-Feira"); break;
            case 6: printf("\nDia de descanso semanal: Sexta-Feira"); break;
            case 7: printf("\nDia de descanso semanal: Sábado"); break;
            default: printf("\n\nErro na leitura do dia de descanso!\n\n"); break;
                }
                printf("\nInicio das ferias: %d/%d", x->info.inicio_ferias.dia, x->info.inicio_ferias.mes);
                printf("\nFim das ferias: %d/%d\n", x->info.fim_ferias.dia, x->info.fim_ferias.mes);
               
                x=x->next;
        }
}

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it was suppose to show diferent lists by order of min vect_distance but he always print the same list...