输入一系列数据(学号,姓名,成绩)存放在文件中;从该文件中读出这些数据并显示:具有增加,删除记录的功能

#include<iostream>
#include<fstream>
using namespace std;

struct student
{
char name[20];
int num;
float chinaNum;
float mathNum;
float englishNum;
} ;

class Student
{
public :
Student()
{
Read();
}
int Read();
void AddNew(int n);
void Write(int n);
void Show(int len);
int Find(char *str, int type, int len);
void Student::Delete(char* find);
void Print(int n);
private :
student stu[50];
};

int Student::Read()
{
ifstream in("Student.czw" );
int n=0;
while(!in.eof())
{
in>>stu[n].name>>stu[n].num>>stu[n].chinaNum>>stu[n].mathNum>>stu[n].englishNum;
if(strcmp(stu[n].name,"")==0)
{
return n;
}
n++;
}

in.close();
return n;
}

void Student: