Question

我有一个正在工作的函数headinsert。这增加了“头”的元素。但我正在尝试创建一个函数endinsert，它在链表的末尾添加一个元素。 到目前为止我的代码是：

void IntList::endInsert(int the_number)
{
    if (head == NULL)//if list is empty
    {
        head = new IntNode; //create new dynamic variable
        head -> data = the_number; //add value to new variable
        head -> link = NULL; 
    }
    else
    {
        NodePtr temp = head; //initialize
        //Now we want to insert in the back of list. Use for loop to get to the last element of list
        for(temp = head; temp-> link != NULL ; temp = temp -> link)
        {
            temp->link = new IntNode; //create a new var
            temp = temp ->link; //give it a "position"
            temp ->data = the_number; //Give it a value
            temp ->link = NULL;  //The new variable will be the last element and therefore points to NULL
        }
    }
}

但由于某种原因，它不起作用:(。有任何提示吗？

提前致谢！

Answer 1

for(temp = head; temp->link != NULL ; temp = temp->link);

// now temp is the last one

temp->link = new IntNode;
temp = temp->link;
temp->data = the_number;
temp->link = NULL;

请注意;循环结束时的for。

Answer 2

当列表非空时，在for()中应该循环到最后一个节点，然后创建一个新节点并附加如下，

for(temp = head; temp-> link != NULL ; temp = temp -> link) ; // at the end you 
                                                                are at last node
        // Now form a link from last node to newly created one
        temp->link = new IntNode; 
        temp = temp ->link; 
        temp ->data = the_number; 
        temp ->link = NULL;

Answer 3

更改代码的这一部分

else
{
    NodePtr temp = head; //initialize
    //Now we want to insert in the back of list. Use for loop to get to the last element of list
    for(temp = head; temp-> link != NULL ; temp = temp -> link)
    {
        temp->link = new IntNode; //create a new var
        temp = temp ->link; //give it a "position"
        temp ->data = the_number; //Give it a value
        temp ->link = NULL;  //The new variable will be the last element and therefore points to NULL
    }
}

以下

else
{
    NodePtr temp = head; //initialize
    //Now we want to insert in the back of list. Use for loop to get to the last element of list
    while ( temp-> link != NULL ) temp = temp -> link;

    temp->link = new IntNode;
    temp->link->link = NULL;
    temp->link->data = the_number; //Give it a value
}

将元素添加到链接列表的末尾

3 个答案: