我文件操作部分学得差，请哪位大神帮忙补充文件操作的子函数，实现学生数据的读取与存储，来完善这个学生成绩管理系统。谢了。
附源代码如下（vc6.0可运行）：

#include<iostream.h>
#include<string.h>
#include<iomanip.h>  
#include<conio.h>
#include<iostream>



struct student //定义一个学生结构体
{
    char name[8];
    int num;
    char add[20];
    int GS,YY,JSJ,SUM;
};


int s=0;


class student1 //定义一个学生类
{
private:
    student stu[40];
    char name,add;
    int num;
    int GS,YY,JSJ,SUM;

public:
    void sr(char *,int,char *,int,int,int);
    void print(int);

    int jc(int xxh)     //JC模块判断学号是否重复
    {
        int m=0;
        while(m<=s+1)
            if(xxh==stu[m++].num)
                break;
            if(m>s+1)
                return 0;
            else
                return 1;
    }
   
     
};



void student1::sr(char *xm,int xh,char *dz,int gs,int yy,int jsj) //输入模块
{
    strcpy(stu[s].name,xm);
    stu[s].num=xh;
    strcpy(stu[s].add,dz);
    stu[s].GS=gs;
    stu[s].YY=yy;
    stu[s].JSJ=jsj;
}



void student1::print(int s) //输出模块
{
    cout<<s<<"\t";
    cout<<stu[s].name<<"\t";
    cout<<stu[s].num<<"\t";
    cout<<stu[s].add<<"\t";
    cout<<stu[s].GS<<"\t";
    cout<<stu[s].YY<<"\t";
    cout<<stu[s].JSJ<<"\t";
    cout<<endl;
}






int main(void)
{
    student1 st;
    char da,a;
    char *xm,*dz;
    int gs,yy,jsj,xh;
    while(1)
    {
        system("cls");
        cout<<endl;
        cout<<" 学生成绩管理系统"<<endl;
        cout<<"1.输入/添加学生资料"<<endl;
        cout<<"2.显示学生资料"<<endl;
        
        cout<<"3.退出"<<endl;
        cout<<"请选择操作(1-3)"<<endl;
        cin>>a;
        t: if(a=='3') break;
        switch (a)
        {
            case '1':
            {
                cout<<"请依次输入学生的姓名,学号,地址,高数,英语,计算机:"<<endl;
                xm=new char[];
                dz=new char[];
                cin>>xm>>xh>>dz>>gs>>yy>>jsj;
                while(st.jc(xh)) //调用JC模块判断学号是否重复
                {
                    cout<<"学号重复，请重新输入！"<<endl;
                    cin>>xh;
                }
                s=s+1;
                st.sr(xm,xh,dz,gs,yy,jsj);

                cout<<"是否继续输入?(y/n)";
                cin>>da;
                while (da=='y'||da=='Y') //判断是否要继续输入
                {
                    cout<<"请依次输入学生的姓名,学号,地址,高数,英语,计算机:"<<endl;
                    xm=new char[];dz=new char[];
                    cin>>xm>>xh>>dz>>gs>>yy>>jsj;
                    while(st.jc(xh))
                    {
                        cout<<"学号重复，请重新输入！"<<endl;
                        cin>>xh;
                    }
                    s=s+1;
                    st.sr(xm,xh,dz,gs,yy,jsj);
                    cout<<"是否继续输入?(y/n)";
                    cin>>da;

                }
                getch();      //在你需要暂停的位置暂停一下，当你按一下任意键它又会继续往下执行！
            };break;


            case '2':
            {
                if(s==0) //判断是否有记录输入
                {
                    cout<<"没有记录，请先输入记录！"<<endl;
                    getch();
                    break;
                }
                if(s!=0)
                {
                    cout<<"序号"<<"\t";
                    cout<<"姓名"<<"\t";
                    cout<<"学号"<<"\t";
                    cout<<"地址"<<"\t";
                    cout<<"高数"<<"\t";
                    cout<<"英语"<<"\t";
                    cout<<"计算机"<<endl;
                    for(int i=1;i<=s;i++)
                        st.print(i);
                    getch();
                }
            };break;
 

            default:
            {
                while(a=='0'||a>'3') //判断选项是否正确
                {
                    cout<<"错误选项，请重新选择！"<<endl;
                    cin>>a;
                }
                goto t;
            };break;
        }
    }
    cout<<"谢谢您的使用!"<<endl;
    return 0;
}