想弄一个学生成绩管理系统，请问还少了哪些内容啊

Question

```#include<iostream>
#include<iomanip>
using namespace std;

struct student
{
    char no[15];
    char name[20];
    char sex;
    int computer;
    int math;
    int english;
    float average;
};

void print()//打印主菜单
{

    cout<<"***********************\n";
    cout<<"   学生成绩管理系统\n";
    cout<<"***********************\n";
    cout<<"\t.1记录成绩\n";
    cout<<"\t.2查询成绩\n";
    cout<<"\t.3修改成绩\n";
    cout<<"\t.4成绩排名\n";
    cout<<"\t.5计算平均分\n";
    cout<<"\t.6查看所有成绩\n";
    
}

void Outputinformation(student a[],int n)//输出成绩表
{
    int i;
    cout<<left<<setw(15)<<"学号"<<"\t"<<setw(20)<<"姓名"<<"\t"//setw
    <<setw(6)<<"性别"<<"\t"
    <<setw(8)<<"C语言成绩"<<"\t"
    <<setw(8)<<"微积分"<<"\t"
    <<setw(8)<<"大学英语"<<"\t"
    <<setw(8)<<"平均成绩"<<"\n";
    for(i=0;i<6;i++)
    {
        cout<<left<<setw(15)<<a[i].no<<"\t";
        cout<<setw(20)<<a[i].name<<"\t";
        cout<<setw(6)<<a[i].sex<<"\t";
        cout<<setw(8)<<a[i].computer<<"\t";
        cout<<setw(8)<<a[i].math<<"\t";
        cout<<setw(8)<<a[i].english<<"\t";
        cout<<setw(8)<<a[i].average<<"\n";
    }
}
int main()
{
    print();
    student stu[6]=
    {
    
        {"101","李马克",'m',0,0,0,0.0},
        {"102","宋人头",'m',0,0,0,0.0},
        {"103","西瓜",'f',0,0,0,0.0},
        {"104","橙子",'f',0,0,0,0.0},
        {"105","菠萝",'f',0,0,0,0.0},
        {"106","胡图图",'m',0,0,0,0.0}
    };
    int choice;
    cout<<"请输入你的选择：\n";
    cin>>choice;
    
    
    if(choice>6)
    {
        cout<<"!!谢谢使用!!*^*"<<endl;
    }
    else if(choice<=6&&choice>0)
     {
        switch(choice)
        {
//            case 1:Inputinformation(stu,5);//录入成绩
//                break; 
//            case 2:search(stu,5);//调用查询函数
//                break; 
//            case 3:stu_modify(stu,5);//修改成绩
//                break; 
//            case 4:sort(stu,5);//成绩排序
//                break; 
//            case 5:stu_average(stu,5);//平均成绩
//                break;
            case 6:Outputinformation(stu,5); //输出成绩
                break; 
        }
}
}

    

Answer 1

可以参考一下：
http://t.csdn.cn/81XgC