Giải đáp về code quản lý sinh viên bằng danh sách liên kết

Đây là code của mình về quản lý sinh viên bằng ds liên kết nhưng bài chạy bị lỗi phần nhập và về phần file mình không ghi đc, khi in ra thì bị lỗi, mong mọi người giúp và sửa chữa giúp với.

#include<stdio.h>
#include<conio.h>
#include<windows.h>
#include <string.h>
#include<iomanip>
#include <iostream>
#include<fstream> 
//#define File_Name "sinhvien.dat"

using namespace std; 

struct date
{
    int ngay, thang, nam;    
};
struct sinhvien
    {
        char malop[20];
        int masv;
        char hoten[30];
        struct date date;
        float diemTB;    
    };
    
//Khai bao cau truc du lieu dslk 
struct Node{
    sinhvien data;
    Node *next;
};


struct List{
    Node *pFirst;
    Node *pLast;
};

//Khoi tao danh sach lk
void Init(List L)
{
    L.pFirst=L.pLast=NULL;
}
//Tao Node sinh vien trong danh sach
Node* createNode(sinhvien sv)
{
    //Cap phat 1 Node
    Node *p=new Node;        
    if(p==NULL)
    {
        return NULL;
    }
    p->data=sv;       //Luu sv vao data
    p->next=NULL;
    return p;
}
//Them Node vao dau danh sach
void addFirst(List &L, sinhvien sv)
{
    Node* p = createNode(sv);
    if(L.pFirst=NULL) //Ds rong
    {
        L.pFirst=L.pLast=p;
    }
    else
    {
        p->next=L.pFirst;     //p tro toi node dau ds
        L.pFirst=p;           //p nam tai vt node dau
    }
    
}

//Them Node vao cuoi danh sach
void addLast(List &L, sinhvien sv)
{
    Node* p = createNode(sv);
    if(L.pFirst=NULL) //Ds rong
    {
        L.pFirst=L.pLast=p;
    }
    else
    {
        L.pLast->next=p;   //pLast tro toi p
        L.pLast=p;         //p tro thanh node cuoi
    }    
}

void addAfter(List &L , Node *p, Node* newNode)
{
    if(p!=NULL)
    {
        newNode->next=p->next;
        p->next=newNode;
        if(p==L.pLast)  L.pLast=newNode;    
    }
} 


void deleteFirst(List &L)
{
    Node *pDel=L.pFirst;
    L.pFirst=L.pFirst->next;
    delete pDel;    
}

void deleteLast(List &L)
{
    Node *pDel=L.pLast;
    Node *pPrev;
    pPrev->next=NULL;
    delete pDel;
}
void delete_k(List &L, sinhvien sv)
{
    Node *p=L.pFirst;
    Node *q=NULL;
//    while(p)
//   {
//        if(p->data==sv.)
//        break;
//        q=p;
//        p=p->next;     //p luon duyet truoc q 1 node
//    }
//    if(p==NULL)
//    cout<<"sv tim thay";
    if(q!=NULL)
    {
        if(p!=NULL)
        {
            q->next=p->next;
            delete (p);
            if(p==L.pLast)  L.pLast=q;
            delete(p);
        }
    }
    else
    {
        L.pFirst=p->next;
        delete(p);
        if(L.pFirst==NULL)  L.pLast=NULL;
    }
}

void CapNhat(List &L)
{
    int chon;
    sinhvien sv;
    Node *p;
    Node* newNode;
    system("COLOR 1B");
    cout<<"1.Them vao dau danh sach.
";
    cout<<"2.Them vao cuoi danh sach.
";
    cout<<"3.Them vao vi tri k cua danh sach.
";
    cout<<"4.Xoa dau danh sach.
";
    cout<<"5.Xoa cuoi danh sach.
";
    cout<<"6.Xoa tai vi tri k cua danh sach.
";
    switch(chon)
    {
        case 1: addFirst(L,sv);
        case 2: addLast(L,sv);
        case 3: addAfter(L, p, newNode);
        case 4: deleteFirst(L);
        case 5: deleteLast(L);
        case 6: delete_k(L, sv);
    }    
}

void writeFile(List L) 
{
    Node *temp; temp=L.pFirst;
    if(temp==NULL) return;
    
    fstream fileout("danhsach.bin",ios::binary|ios::out);
    
    int n=0;
    while(temp!=NULL){
            n++;
            fileout.write((char*)&(temp ->info),sizeof(sinhvien));
            temp=temp->next;
    }
    fileout.close();
}

void readFile(List &L)
{
    
    sinhvien sv;
    fstream filein("danhsach.txt",ios::binary|ios::in);
    if(filein==NULL) return;
    
    while(!filein.eof()){
        filein.read((char* )&sv,sizeof(sinhvien));
        if(EmptyList(L))
        {
            addFirst(L,sv);
        }
        else  addLast(L,sv);    
    }
    filein.close();
void Nhap()
{
    sinhvien sv;
    system("cls");
    printf("-------------------------------");
    cout<<"
Ho ten sv: ";
    fflush(stdin);
    gets(sv.hoten);
    cout<<"Ma lop: ";
    gets(sv.malop);
    cout<<"Ma sv: ";
    cin>>sv.masv;
    cout<<"Nhap vao ngay thang nam sinh
";
    do
    {
        cout<<"*Ngay sinh: ";
        cin>>sv.date.ngay;
        fflush(stdin);
    }while(sv.date.ngay > 31 || sv.date.ngay < 1);
    do
    {    
        fflush(stdin);
        cout<<"*Thang sinh: ";
        cin>>sv.date.thang;
    }while(sv.date.thang > 12 || sv.date.thang< 1);
    do
    {
        fflush(stdin);
        cout<<"*Nam sinh: ";
        cin>>sv.date.nam;
    }while(sv.date.nam > 2016 || sv.date.nam< 1000);
            
    do
    {
        cout<<"Nhap vao diem trung binh: ";
        cin>>sv.diemTB;
    }   
    while(sv.diemTB<=0 || sv.diemTB>= 10);

}
void NhapSV(List &L)
{
    sinhvien sv;
    system("cls");
    int n;
    cout<<"Nhap so luong ho so: ";
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cout<<"Thong tin ho so sinh vien thu:  "<<i+1<<" 
";
        Nhap();
        addLast(L,sv);
        system("cls");    
    }
    cout<<"Hoan thanh nhap ho so"<<endl;
    
}

void InDS(List &L)
{
    int i=1;
    system("cls");
    sinhvien sv;
    
    if(L.pFirst==NULL)
    cout<<endl<<"Khong co sinh vien nao trong danh sach!!!
";
    

    Node *p=L.pFirst;
    cout<<" ________________________________________________________________________________________________________"<<endl;
    cout<<"|  STT  |         Ho va ten         |    Ngay sinh   |    Ma sinh vien   |    Ma lop    |     Diem TB   |"<<endl;
    cout<<"|_______|___________________________|________________|___________________|______________|_______________|"<<endl;
    while(p!= NULL)
    {
        cout<<"|"<<setw(4)<<i<<"  |"<<setw(20)<<p->data.hoten<<setw(5)<<p->data.date.ngay<<" /"<<p->data.date.thang<<" /"<<p->data.date.nam
        <<"   |"<<setw(12)<<p->data.masv<<"   |"<<setw(10)<<p->data.malop<<"   |"<<setw(12)<<p->data.diemTB; 
        p = p->next;
        i++;
    }
    cout<<"
|_______|___________________________|________________|___________________|______________|_______________|
";
}

void gotoxy(int x, int y)
{
    static HANDLE h = NULL;
    if(!h)
    {
        h = GetStdHandle(STD_OUTPUT_HANDLE);
        COORD c = {x,y};
        SetConsoleCursorPosition(h,c);
    }
}
int Drawtext(int line, int cot, int focus, char Text[])
{
       
    HANDLE hConsoleColor;
    hConsoleColor = GetStdHandle(STD_OUTPUT_HANDLE);
    SetConsoleTextAttribute(hConsoleColor,focus);
    
    printf("%s
",Text);
    
}


int Menu(int &chon)
{
    sinhvien *sv;
    int n=0;
    system("cls");
    
    char TextMenu[][100] ={"                              |************* Quan ly sinh vien *************|",
                           "                              |              1. Them moi ho so.             |",           
                           "                              |              2. Cap nhat danh sach.         |",
                           "                              |              3. IN danh sach.               |",
                           "                              |              4. Sap xep danh sach.          |",
                           "                              |              5. Tim kiem ho so.             |",
                           "                              |              6. Thong ke ho so.             |",
                           "                              |              7. Thoat.                      |", 
                           "                              ***********************************************",
                       };
        
     
    int i=2;        //dong chon bat dau tu vi tri dong 2
    char ch;

    do{
        system("cls");  
        for (int t=1; t<=9; t++)
        {
            
            if (t==i) Drawtext(7+t,2,3,TextMenu[t-1]);
            else Drawtext(7+t,2,14,TextMenu[t-1]);
        }        
        do{
            ch = getch();
            if (ch==224) ch=getch();
        } while (!(ch==224||ch==13||ch==27||ch==80||ch==72));
        if(ch==80){         //ky tu xuong
            i++; 
             if (i>8) i = 2; //neu dong chon het dong 8 quay lai dong 2
        }
        if (ch==72)          //ky tu len
        {
            i--; 
            if (i<1) i = 7; 
        }
    } while (!(ch == 13 || ch == 27)); 

    List L;
    switch(i)
    {
        case 2: 
            {
        
                 NhapSV(L);
                 writeFile(sv,n);
                 break;
            }
        case 3: 
            {
                CapNhat(L);
                break;
            }
        case 4: 
            {
                readFile(L,n);
                InDS(L);
                system("pause");
                break;
                
        case 5:
            {
                break;
            }
        case 6:
            {
                break;
            }
        case 7: return 1;
    }
    
    }

}


int main(){
    List L; int n=0, chon;
    sinhvien sv;
    Init(L);
    readFile(L,n); 
    writeFile(&sv,n);
    system("cls");
    while(1)
    {
        Menu(chon);    
    }
    
    system("PAUSE");
}