代码出现段错误或从未完成其运行

Question

我的代码用于从链接列表L中删除值target。由于某种原因我找不到，它要么导致段错误，要么永远不会运行第二个打印语句。如果数字被删除，它也应该返回 0；如果没有，则返回 1。

unsigned int removeNumber(LL_t * L, int target)

{
    int ret = 0;
    node_t * current = L->head;
    node_t * previous = NULL;
    node_t * tmp = current;

    for(current = L->head; current != NULL; previous = current, current->next)
    {
        if ((current->data == target) && (previous != NULL))
        {
            free(current);
            current = current->next;
            previous = current;
            ret += 1;
        }
        else if ((current->data == target) && (previous == NULL)){
            L->head = current->next;
        }
    }
    if (ret > 0)
    {
        return 0;
    }
    return 1;
}

Answer 1

您的代码有一些错误，请改用此代码。

unsigned int removeNumber(LL_t * L, int target)

{
    int ret = 0;
    node_t * current = L->head;
    node_t * previous = NULL;
    node_t * tmp = current;

if(current->data==target)
{
 L->head=current->next;
  free(current);
  ret++;
}

else
{

    for(current = L->head; current->next != NULL; current= current->next)
    {
        if ((current->next->data == target) )
        {
            free(current);
            previous = current->next;
            current->next= previous->next;
            free(previous);
           ret++;
        }

    }

}
   if (ret > 0)
    {
        return 0;
    }
    return 1;
}