为什么我的append函数未显示输出?

时间:2019-12-25 08:02:03

标签: c data-structures linked-list insertion

我正在使用此append函数将数据追加到链接列表中,但未显示任何输出。我已经多次审查了代码。该代码在我之前的代码中有效。


void append(struct Node** head_ref, int new_data)
{
/* 1. allocate node */
    struct Node* new_node = (struct Node*) malloc(sizeof(struct Node));

    struct Node *last = *head_ref;  /* used in step 5*/

    /* 2. put in the data  */
    new_node->data  = new_data;

    /* 3. This new node is going to be the last node, so make next
          of it as NULL*/
    new_node->next = NULL;

    /* 4. If the Linked List is empty, then make the new node as head */
    if (*head_ref == NULL)
    {
       *head_ref = new_node;
       return;
    }

    /* 5. Else traverse till the last node */
    while (last->next!= NULL)
        last = last->next;

    /* 6. Change the next of last node */
    last->next = new_node;
    return;
}

void printList(struct Node *node)
{
while(node->next!=NULL)
{
printf("%d ",node->data);
node = node->next;
}
}

int main()
{
struct Node *head = NULL;

push(&head,7);
push(&head,1);
push(&head, 3);
push(&head, 2);
append(&head,5);

puts("Created Linked List: ");
printList(head);
//deleteNode(&head, 1);
puts("\nLinked List after Deletion of 1: ");
printList(head);
return 0;
}

正在输出: 2-> 3-> 1-> 7 虽然我需要输出: 2-> 3-> 1-> 7-> 5

  

我应该在链接列表管理中进行更改吗?

1 个答案:

答案 0 :(得分:3)

问题仅在于在printList()中打印出来:

while(node->next!=NULL)

最后一个节点具有值5node->next == NULL,因此循环将终止而不进行打印。只需更改为:

while(node != NULL)