用指针实现一个链表，并对链表执行查找、排序、插入、删除操作。 指针节点为学生信息，包含学号、姓名、性别、年龄。

问题遇到的现象和发生背景

没有报错 但是运不出来 我不知道多数据的动态链表该怎么写

include <iostream>
#include<string>
using namespace std;
struct Student {
    int num;
    string name;
    string sex;
    int age;
    struct Student* next;
};
Student* creatlist(int arr[], int len) {
    Student* p, * head, * pre;
    head = new Student;
    head->next = NULL;
    pre = head;
    for (int i = 0;i < len;i++) {
        p = new Student;
        p->num = arr[i];
        pre->next = p;
        pre = p;
    }
    return head;
}
void sort(Student* head){
    Student* p1, * p2;
    for (p1 = head;p1->next != NULL;p1 = p1->next) {
        for (p2 = p1->next;p2 != NULL;p2 = p2->next) {
            if (p1->num > p2->num) {
                int t;
                t = p1->num;
                p1->num = p2->num;
                p2->num = t;
            }
        }
    }
}
void insert(Student* head,Student stu,int pos) {
    Student* p, * pre;
    pre = head->next;
    p = new Student;
    p->num = stu.num;
    p->name = stu.name;
    p->sex = stu.sex;
    p->age = stu.age;
    while (pre != NULL) {
        if (pre->num == pos) {
            p->next = pre->next;
            pre->next = p;
        }
        else pre = pre->next;
    }
}
void del(Student* head, int pos) {
    Student* p,*pre;
    pre = head;
    p = pre->next;
    while (p != NULL) {
        if (p->num == pos) {
            pre->next = p->next;
            delete(p);
            p = pre->next;
        }
        else {
            pre = p;
            p = p->next;
        }
    }
}
void search(Student* head, int num) {
    Student* p;
    p = head->next;
    while (p != NULL) {
        if (p->num == num) {
            cout << p->num << " " << p->name << " " << p->sex << " " << p->age << endl;
        }
        else p = p->next;
    }
}
int main() {
    Student a, b, c;
    a.num = 1002;a.name = "zhaoheng";a.sex = "nv";a.age = 18;
    b.num = 1001;b.name = "hejieli";b.sex = "nv";b.age = 19;
    c.num = 1004;c.name = "xiaohe";c.sex = "nv";c.age = 19;
    int arr[3] = { a.num,b.num,c.num };
    Student* S = creatlist(arr, 3), * p;
    sort(S);
    Student stu;
    stu.num = 1003;
    stu.name = "xiaozhao";
    stu.sex = "nv";
    stu.age = 18;
    insert(S, stu, 1002);
    del(S, 1004);
    search(S, 1001);
    p = S->next;
    while (p!=NULL) {
        cout << p->num << " " << p->name << " " << p->sex << " " << p->age;
        p = p->next;
    }
    return 0;
}

#include没加"#”号