数据结构初学

#include <iostream>

using namespace std;
struct List
{
    List *node;
    int n;
};

List *create(List *head)
{
    int sum,i=1;;
    cout<<"输入总数:"<<endl;
    cin>>sum;
    List *p;
    List *Node =NULL;
    for(i=1;i<=sum;i++){
    Node =new List;
    cin>>Node->n;
    if(head==NULL)
    {
        head=Node;
    }
    else
        p->node=Node;
        p=Node;
    if(i==sum)
    {
        p->node=NULL;
    }
}
    return head;
}

List* insert(int n,List *head,int num){
    List *p=NULL;
    List *q=NULL;
    p=head;
    int i=0;
    while(p!=NULL){ i++;
        if(i==n-1){
        q=new List;
    q->n=num;
    q->node=p->node;
            p->node=q;

        }
        p=p->node;

    }

List* delet(int n,List *head){
    List *p=NULL;
    p=head;
    int i=1;
    if(n==1){
        head=p->node;
    }
    else{
   while(p!=NULL){
            i++;
    if(i==n-1){
        p->node=p->node->node;
    }
    p=p->node;
   }
    }
      return head;
}

void show(List *head)
{
    List *p=NULL;
    p=head;
    while(p!=NULL)
    {
        cout<<p->n<<endl;
        p=p->node;

    }
}

int main()
{
    List *student=NULL;
    student= create(student);
    show(student);
   student= delet(1,student);
    show(student);
    cout<<"*------------------*"<<endl;
    student=insert(2,student,8);
    show(student);
    return 0;
}