各位高手，帮我看看为什么这个删除和修改的部分老不行？
各位高手，帮我看看为什么这个删除和修改的部分老不行？每次我录入两组数据时可以运行，但是录入三组数据时便不行？帮我看看到底是哪里出错啦？不好意思哦，我是初学者。。谢谢啦。。。#include<iostream>
#include<fstream>
#include<string>
using namespace std;
class Student
{
int N,addr[50],i,k;
char number[50],name[50];
double Chinese,Math,English,sum,ave;
public:
Student();
~Student();
Student(char number[50],char name[50],double Chinese,double Math,double English);
void AddStudent(char number[50],char name[50],double Chinese,double Math,double English);
void DeleteStudent();
void ChangeStudent();
void DispAll();
Student *stu;
};
Student::Student()
{
number[0]='0';
name[0]='0';
Chinese=0;
Math=0;
English=0;
for(int i=0;i<50;i++)
{
addr[i]=0;
}
N=0;
}
Student::Student(char number1[50],char name1[50],double Chinese1,double Math1,double English1)
{
strcpy(number,number1);
strcpy(name,name1);
Chinese=Chinese1;
Math=Math1;
English=English1;
}
Student::~Student()
{
}
void Student::AddStudent(char number[50],char name[50],double Chinese,double Math,double English)
{
ofstream fileout("学生成绩管理.txt",ios::app);
if (!fileout)
{
cerr<<"文件学生成绩管理.txt打开失败!"<<endl;
exit(1);
}
fileout<<"学号："<<number<<endl;
fileout<<"姓名："<<name<<endl;
fileout<<"语文："<<Chinese<<endl;
fileout<<"数学："<<Math<<endl;
fileout<<"英语："<<English<<endl;
stu=new Student(number,name,Chinese,Math,English);
addr[N]=(int)stu;
N++;
fileout.close();
}
void Student::DeleteStudent()
{ int i;
char m[50],c;
bool d=0;
do
{
cout<<"请输入您要删除的学生的学号："<<endl;
cin>>m;
for(i=0;i<N;i++)
{
if(strcmp(m,stu[i].number)==0)
{
d=1;
N--;
do
{
stu[i]=stu[i+1];
i++;
}while(i<=N);
}
}
if(d==0)
cout<<"您要求删除的对象本来就不存在！请检查输入的正确性!";
cout<<"要继续删除吗？(y/n)"<<endl;
cin>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}while(c=='y');
}
void Student::ChangeStudent()
{ int i,k,p;
char m[50],c;
bool d=0;
do
{
cout<<"请输入您要修改的学生的学号："<<endl;
cin>>m;
for(i=0;i<N;i++)
{
if(strcmp(m,stu[i].number)==0)
{ d=1;
do
{ cout<<"==========================="<<endl;
cout<<"||请选择您需要的操作: ||"<<endl;
cout<<"==========================="<<endl;
cout<<"||1.修改该学生的语文成绩:||"<<endl;
cout<<"||2.修改该学生的数学成绩:||"<<endl;
cout<<"||3.修改该学生的英语成绩:||"<<endl;
cout<<"==========================="<<endl;
cout<<"||请输入您要修改的选项 ||:"<<endl;
cin>>k;
switch(k)
{
case 1:
{
cout<<"请输入该学生的语文成绩:"<<endl;
cin>>p;
stu[i].Chinese=p;
break;
}
case 2:
{
cout<<"请输入该学生的数学成绩:"<<endl;
cin>>p;
stu[i].Math=p;
break;
}
case 3:
{
cout<<"请输入该学生的英语成绩:"<<endl;
cin>>p;
stu[i].English=p;
break;
}
}
}while(i!=0);
}
}
if(d==0)
cout<<"您要求修改的对象本来就不存在！请检查输入的正确性!";
cout<<"要继续修改吗？(y/n)"<<endl;
cin>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}while(c=='y');
}
void Student::DispAll()
{
cout<<"本系统所有学生数据如下："<<endl;
if(N==0)
cout<<"管理系统中没有录入数据或者数据已经被删除！"<<endl;
cout<<"学号"<<"\t姓名"<<"\t语文"<<"\t数学"<<"\t英语"<<endl;
for (int i=0;i<N;i++)
{
stu=(Student*)addr[i];
cout<<stu->number<<'\t'<<stu->name<<'\t'<<stu->Chinese<<'\t'<<stu->Math<<'\t'<<stu->English<<endl;
}
}
void main()
{
Student stu;
int select=0,k,i;
int N=0,addr[50];
char number[50],name[50],c,m;
double Chinese,Math,English,sum,ave;
bool d=0;
do
{cout<<" ***--------------------------------------------------***"<<endl;
cout<<" *** ***"<<endl;
cout<<" *** 欢迎进入学生成绩管理系统 ***"<<endl;
cout<<" *** ***"<<endl;
cout<<" ***--------------------------------------------------***"<<endl;
cout<<" || 请选择您需要的操作： ||"<<endl;
cout<<" || 信息维护： ||"<<endl;
cout<<" || (0)数据录入 ||"<<endl;
cout<<" || (1)增加人员 ||"<<endl;
cout<<" || (2)删除人员 ||"<<endl;
cout<<" || (3)修改数据 ||"<<endl;
cout<<" || 信息查询： ||"<<endl;
cout<<" || (4)按总成绩查询 ||"<<endl;
cout<<" || (5)按姓名查询 ||"<<endl;
cout<<" || (6)输出所有学生的数据||"<<endl;
cout<<" || 成绩排名: ||"<<endl;
cout<<" || (7)按总分查询排名 ||"<<endl;
cout<<" || (8)按语文查询排名 ||"<<endl;
cout<<" || (9)按数学查询排名 ||"<<endl;
cout<<" || (10)按英语查询排名 ||"<<endl;
cout<<" || (11)退出 ||"<<endl;
cout<<" || 选择相关操作请输入相对的括号里的阿拉伯数字！ ||"<<endl;
do
{
cin>>select;
if(select>=0&&select<=11)
d=1;
else
cout<<"指令错误！请重新输入："<<endl;
}while(d==0);
switch (select)
{case 0:{
do
{
cout<<"请输入学号:";
cin>>number;
cout<<endl;
cout<<"请输入姓名:";
cin>>name;
cout<<endl;
cout<<"请输入语文成绩:";
cin>>Chinese;
cout<<endl;
cout<<"请输入数学成绩:";
cin>>Math;
cout<<endl;
cout<<"请输入外语成绩:";
cin>>English;
cout<<endl;
stu.AddStudent(number,name,Chinese, Math, English);
stu.DispAll();
cout<<"数据录入成功，想继续录入吗(y/n)"<<endl;
cin>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}while(c=='y');
break;
}
case 1:{
do
{
cout<<"请输入学号:";
cin>>number;
cout<<endl;
cout<<"请输入姓名:";
cin>>name;
cout<<endl;
cout<<"请输入语文成绩:";
cin>>Chinese;
cout<<endl;
cout<<"请输入数学成绩:";
cin>>Math;
cout<<endl;
cout<<"请输入外语成绩:";
cin>>English;
cout<<endl;
stu.AddStudent(number,name,Chinese, Math, English);
stu.DispAll();
cout<<"数据录入成功，想继续录入吗(y/n)"<<endl;
cin>>c;
if(c!='y'&&c!='n')
{
cout<<"指令错误！请重新输入！"<<endl;
cin>>c;
}
}while(c=='y');
break;
}
case 2:{
stu.DeleteStudent();
stu.DispAll();
break;
}
case 3:
{
stu.ChangeStudent();
stu.DispAll();
break;
}
}
}while(select!=11);
}
