我正在尝试这个新项目，这是我不久前被介绍的，但我不确定这里发生了什么。我确信我可以将一个 int 存储在一个 int 变量中，但它告诉我我无法从 int 转换为 student，而且我不确定它试图告诉我什么。有人可以向我解释一下这到底是想告诉我什么或我想念什么吗？
#include <iostream>
using namespace std;
class student
{
public:
int id; //student ID number
string name; //student’s name
string university; //student’ university
};
//student list is a doubly linked list of students.
class studentList
{
private:
class node
{
public:
student data;
node * next;
node * prev;
};
node * head;
public:
studentList()
{
head = NULL;
}
//be sure to free all dynamically allocated memory!
~studentList();
//return true if the list is empty, false if not
bool empty()
{
if(head == NULL)
return true;
else
return false;
};
//insert student s into the front of the linked list
void push(student s)
{
node * nodeptr;
nodeptr = new node();
nodeptr->data = s;
nodeptr->next = head;
head = nodeptr;
nodeptr->prev = head;
if (nodeptr->next != NULL)
nodeptr->next->prev = nodeptr;
};
//remove and return the student at the front of the list
student pop()
{
node * nodeptr;
int y;
nodeptr = head;
if (head->next != NULL)
head->next->prev = head;
head = head->next;
y = nodeptr->data.id;
delete nodeptr;
return y;
};
//locate and remove the student with given ID number
void removeStudent(int id);
//locate and return a copy of the student with given ID number
student getStudent(int id);
//arrange students into increasing based on either ID or name. If
//variable 'field' has value "id", sort into increasing order by id.
//If 'field' has value "name", sort into alphabetical order by name.
void sort(string field);
//a test function to simply display the list of students to the screen
//in the order they appear in the list.
void display();
};