大家可以帮我下吗？？需要全部过程。希望可以求得帮助。万分感谢。同学出的。必须的要做出来

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

typedef struct tagSTUDENT_SCORE
{
    unsigned int uNo;//
    char szName[50];//
    float fMath;
    float fEnglish;
    float fJava;
    float fAvg;//平均
    float fTotal;//总
    tagSTUDENT_SCORE()
    {
        memset(this,0,sizeof(tagSTUDENT_SCORE));
    }
}STUDENT_SCORE,*LPSTUDENT_SCORE;
///解析字符串函数
char * spliter_str(char * pBegin,int &len/*out*/,char* record_buf/*out*/,unsigned int record_buf_len/*缓冲区长度*/)
{
    len=0;
    char *p = pBegin;
    while(*p != ',')
    {
        p++;
        len++;
    }
    if(len > 0 )
    {
        if(len >= record_buf_len)
            len = record_buf_len - 1;
        memset(record_buf,0,record_buf_len);
        memcpy(record_buf,pBegin,len);
    }
    p++;
    return p;
}
//冒泡排序
void bubble_sort(vector<STUDENT_SCORE>&x)
{
    int j,h,n=x.size();
    STUDENT_SCORE t;
    for (h=n-1; h>0; h--) /*循环到没有比较范围*/
    {
        for (j=0; j<h; j++)
        {
            if (x[j].fTotal < x[j+1].fTotal) /*小的放在后面，大的放到前面*/
            {
                t = x[j];
                x[j] = x[j+1];
                x[j+1]= t; /*完成交换*/
            }
        }
    }
}
//输出操作菜单
void print_ctrl_menu()
{
    cout<<"========================"<<endl
        <<"\t 1 打印学生信息\n"
        <<"\t 2 输入学号，打印学生信息\n"
        <<"\t 3 打印学生名次\n"
        <<"\t 0 退出\n"
        <<"========================"<<endl;
}
//获取选择
int get_user_sel()
{
    print_ctrl_menu();
    cout<<"请输入选择:";
    int sel;
    cin>> sel;
    while(sel<0 || sel > 3)
    {
        cout<<"输入有误，请重新输入"<<endl;
        print_ctrl_menu();
        cout<<"请输入选择:";
        cin>> sel;
    }
    return sel;
}
//获取输入的学号
unsigned int get_stu_no()
{
    cout<<"\t 请输入学号:";
    unsigned int no;
    cin>>no;
    return no;
}
//打印学生信息
void printf_stu_info(const vector<STUDENT_SCORE>&stuInfo,bool bPrintOrder=false)
{
    for(int i=0;i<stuInfo.size();i++)
    {
        cout<<"\n学号:"<<stuInfo[i].uNo
            <<"\t姓名:"<<stuInfo[i].szName
            <<"\t数学:"<<stuInfo[i].fMath
            <<"\t英语:"<<stuInfo[i].fEnglish
            <<"\tJAVA:"<<stuInfo[i].fJava
            <<"\t平均分:"<<stuInfo[i].fAvg
            <<"\t总分:"<<stuInfo[i].fTotal;
        if(bPrintOrder)
            cout<<"\t名次:"<<i+1;
        cout<<endl;
    }
}
//查找学生信息
void fin_stu_info(unsigned int no,const vector<STUDENT_SCORE>&stuInfo)
{
    for(int i=0;i<stuInfo.size();i++)
    {
        if(stuInfo[i].uNo == no)
        {
            cout<<"\n学号:"<<no
                <<"\t姓名:"<<stuInfo[i].szName
                <<"\t数学:"<<stuInfo[i].fMath
                <<"\t英语:"<<stuInfo[i].fEnglish
                <<"\tJAVA:"<<stuInfo[i].fJava
                <<"\t平均分:"<<stuInfo[i].fAvg
                <<"\t总分:"<<stuInfo[i].fTotal
                <<"\t名次:"<<i+1
                <<endl;
            return;
        }
    }
    cout<<"\n无相关信息"<<endl;
}
int main()
{
    const char * filename = "students.txt";
    ifstream ifile(filename,ios_base::in);//注意，初始数据文本文件最后不要有多余换行
    vector<STUDENT_SCORE> oldStuInfo;
    char buf[sizeof(STUDENT_SCORE)]={0};
    ifile.getline(buf,sizeof(STUDENT_SCORE));
    while(!ifile.eof())///开始解析字符串，并将内容保存至oldStuInfo
    {
        char record[50]={0};///保存解析后的字符串
        STUDENT_SCORE stu;
        char *p = buf;
        int len=0;
        p = spliter_str(p,len,record,sizeof(record));
        if(len>0)
        {
            stu.uNo = atoi(record);//获取学号
            p = spliter_str(p,len,record,sizeof(record));
            if(len>0)
            {
                memcpy(stu.szName,record,len);//获取姓名
                p = spliter_str(p,len,record,sizeof(record));
                if(len>0)
                {
                    stu.fMath = atof(record);//数学
                    p = spliter_str(p,len,record,sizeof(record));
                    if(len>0)
                    {
                        stu.fEnglish = atof(record);//英语
                        p = spliter_str(p,len,record,sizeof(record));
                        if(len>0)
                        {
                            stu.fJava = atof(record);//java
                            stu.fTotal = stu.fJava + stu.fMath + stu.fEnglish;
                            stu.fAvg = stu.fTotal / 3;
                            oldStuInfo.push_back(stu);
                        }//java
                    }//英语
                }//数学
            }//获取姓名
        }//获取学号
        memset(buf,0,sizeof(STUDENT_SCORE));
        ifile.getline(buf,sizeof(STUDENT_SCORE));
    }
    ifile.close();//关闭输入文件

    vector<STUDENT_SCORE> stuInfo(oldStuInfo);
    bubble_sort(stuInfo);//排序
   
    int sel = 0;
    while((sel = get_user_sel()) != 0)
    {
        switch(sel)
        {
        case 1:printf_stu_info(oldStuInfo);break;
        case 2:
            {
                unsigned int no = get_stu_no();
                fin_stu_info(no,stuInfo);
            }
            break;
        case 3:printf_stu_info(stuInfo,true);break;
        default:
            break;
        }
    }

    ///保存信息至文件
    FILE * lpFile = NULL;
    if(fopen_s(&lpFile,filename,"w") == 0)
    {
        if(lpFile)
        {
            for(int i = 0;i<oldStuInfo.size();i++)
            {
                fprintf(lpFile,"%02d,%s,%.0f,%.0f,%.0f\n",
                    oldStuInfo[i].uNo,
                    oldStuInfo[i].szName,
                    oldStuInfo[i].fMath,
                    oldStuInfo[i].fEnglish,
                    oldStuInfo[i].fJava);
            }
            fclose(lpFile);
        }
    }

    stuInfo.clear();
    oldStuInfo.clear();
}