设计一个学生类，属性：name sex address grade score
设计一个学生类，属性：name sex address grade score 并包含构造函数与析构函数以及 函数chang(),insert(),display(),found()
chang(）用于修改个人信息 insert()用于添加信息 fisplay()显示信息found()用于查找指定姓名的个人信息
编写个MAIN（）函数，为学生类创建对象，验证对象的服务，要求体现文件操作
参考答案:这个是按照你要求给出的，要简单就无法满足你要求。
#include "stdafx.h"
using namespace std;
class CPeople
{
public:
CPeople(void);
~CPeople(void);
void change(int,string,bool,string,int,float);
void insert(string,bool,string,int,float);
void display(int);
void found(string);
void iconnect(void);
void iclose(void);
void oconnect(int);
void oclose(void);
private:
string dbfile;
string dbfilebk;
ifstream in;
ofstream out;
string name;
bool sex;
string address;
int grade;
float score;
};
CPeople::CPeople(void){dbfile="db.txt";dbfilebk="db_bk.txt";}
CPeople::~CPeople(void)
{
if(in.is_open()) in.close();
if(out.is_open()) out.close();
}
void CPeople::iconnect(void)
{
using std::ios;
in.open(dbfile.c_str());
if(in.fail())
{
cout<<"An error occured when programe opening the dbfile!"<<endl;
exit(1);
}
}
void CPeople::iclose(void)
{
in.close();
}
void CPeople::oconnect(int _num)
{
using std::ios;
if(_num!=-1)
out.open(dbfile.c_str(),ios::app);
else
out.open(dbfilebk.c_str(),ios::app);
if(out.fail())
{
cout<<"An error occured when programe opening the dbfile!"<<endl;
exit(1);
}
}
void CPeople::oclose(void)
{
out.close();
}
void CPeople::insert(string _name,bool _sex,string _address,int _grade,float _score)
{
oconnect(0);
out<<_name.c_str()<<","<<_sex<<","<<_address.c_str()<<","<<_grade<<","<<_score<<"\n";
oclose();
cout<<"Inserting Finished!"<<endl;
}
void CPeople::change(int _idx,string _name,bool _sex,string _address,int _grade,float _score)
{
iconnect();
oconnect(-1);
int cnt = 1;
string tmp;
in>>tmp;
while(!in.eof())
{
if(cnt==_idx)
out<<_name.c_str()<<","<<_sex<<","<<_address.c_str()<<","<<_grade<<","<<_score<<"\n";
else
out<<tmp<<"\n";
in>>tmp;
cnt++;
}
oclose();
iclose();
//移除原来文件
remove(dbfile.c_str());
rename(dbfilebk.c_str(),dbfile.c_str());
cout<<"Editing Finished!"<<endl;
}
void CPeople::display(int _idx)//from 0 to unlimit
{
iconnect();
if(_idx<0)//显示全部
{
string tmp;
in>>tmp;
while(!in.eof())
{
cout<<tmp<<endl;
in>>tmp;
}
}
else
{
int cnt = 1;
string tmp;
in>>tmp;
while(!in.eof())
{
if(cnt==_idx)
{
cout<<tmp<<endl;
return;
}
in>>tmp;
cnt++;
}
}
iclose();
}
void CPeople::found(string _name)
{
iconnect();
string tmp;
in>>tmp;
while(!in.eof())
{
if(_name==tmp.substr(0,tmp.find(",")))
{
cout<<tmp<<endl;
}
in>>tmp;
}
iclose();
}
int _tmain(int argc, _TCHAR* argv[])
{
CPeople p;
p.insert("DD",0,"sh",1,100);
//p.found("cc");
//p.change(7,"DD",0,"sh",1,100);
// p.display(-1);//显示全部
//p.display(3);
return 0;
}
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stdafx.cpp
_________________________
#include "stdafx.h"
_________________________
stdafx.h
_________________________
#pragma once
#include <iostream>
#include <tchar.h>
#include <string>
#include <fstream>
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在程序相同目录下新建一个名字为db.txt的空文本文件
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PS:在VS.Net2003 Windows XP Pro下测试运行过