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POHow to sort list items by their priority in C?
 

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  1. POHow to sort list items by their priority in C?
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    <p>I want to sort list items by their priority, which the user types in, and it does that well. However, when there is more than one item with the same priority, it doesn't sort them by order of arrival like it's supposed to. </p> <p>I'm sorry if I'm not making this clear enough so you can understand. The names of the variables are in portuguese, so if you don't understand someting, please ask.</p> <p>Here is the code:</p> <pre><code>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]; }; ppedido novo_pedido(ppedido lista) { ppedido novo, aux, anterior = NULL; int i; novo = (struct pedido*)malloc(sizeof(pedido)); if(novo == NULL){ printf("Erro na alocacao de memoria...\n"); return; } printf("Number of menus: "); scanf("%d", &amp;novo-&gt;n_pratos); printf("Table number: "); scanf("%d", &amp;novo-&gt;mesa); printf("Priority of request? "); scanf("%d", &amp;novo-&gt;prioridade); printf("Introduza o ID do pedido: "); scanf("%s", &amp;novo-&gt;id); for(i=0;i&lt;novo-&gt;n_pratos;i++){ printf("ID of menu %d: ", i+1); //something like "M1, M4..." doesn't matter scanf("%s", &amp;novo-&gt;prato[i]); fflush(stdin); } novo-&gt;prox=NULL; if(lista == NULL || novo-&gt;prioridade &gt; lista-&gt;prioridade) { novo-&gt;prox = lista; lista = novo; } else { aux = lista; while(aux != NULL &amp;&amp; novo-&gt;prioridade &lt; aux-&gt;prioridade) //this is where it should be sort requests by their priority and order of arrival aux = aux-&gt;prox; novo-&gt;prox = aux-&gt;prox; aux-&gt;prox = novo; } return lista; } </code></pre>
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    1. COHow is your code supposed to know when something arrived?
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    2. COI ask for the details of the request and it put them in the list and when the function is called again the list has someting already. So the menus asked after the first one should go to the positions after it, right?
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