学生信息管理

 1 学生类：

#pragma once
#include <iostream>
#include <string>
using namespace std;

class Student
{
public:
	
	Student(void)
	{
	}

	Student(int id,string name,double score):_id(id),_name(name),_score(score)
	{		 
	}

	virtual ~Student(void)
	{

	}
	int GetId()
	{
		return _id;
	}
	string GetName()
	{
		return _name;
	}
	double GetScore()
	{
		return _score;
	}
	
	void SetId(int id)
	{
		 _id=id;
	}
	void SetName(string name)
	{
		 _name=name;
	}
	void SetScore(double score)
	{
		 _score=score;
	}
private:
	int _id;
	string _name;
	double _score;

};

 

 

2 学生管理类：

#pragma once
#include <deque>
#include <string>
#include "Student.h"


typedef deque<Student> STU_LIST;
typedef STU_LIST::iterator  STU_LIST_ITER;
class StudentManager
{
public:
	StudentManager(void);
	virtual ~StudentManager(void);
	void AddStu(const Student&);
	void DelStu(int);
	Student& FindStu(int);
	void PrintStuByLikeName(string);
	void Display();
	void SaveFile( );
	StudentManager& ReadFile();
	Student& FindByIndex(int);
	void EditByIndex(int,int,string,double);
	
private:
	STU_LIST _stuList;
};
//———————————————————————————————


#include "StudentManager.h"
#include "Student.h"
#include <string>
#include <deque>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iterator>
using namespace std;

StudentManager::StudentManager(void)
{
	 
}

void StudentManager::AddStu(const Student& s)
{
	_stuList.push_back(s);
}

void StudentManager:: Display()
{
	STU_LIST_ITER iter;
	Student stu;
	for(iter=this->_stuList.begin();iter!=this->_stuList.end();++iter)
	{
		stu=(*iter);
		cout<<stu.GetId()<<"    "<<stu.GetName()<<"    "<<stu.GetScore()<<endl;
	}
}


void StudentManager::DelStu(int id)
{
	STU_LIST_ITER it;
	for(it=this->_stuList.begin(); it!=_stuList.end(); )
    {
		Student stu=(* it);
		if(stu.GetId() == id)
        {
            it = _stuList.erase(it);
        }
        else
        {
            ++it;
        }
    }
}

void  StudentManager::PrintStuByLikeName(string likename)
{
	STU_LIST_ITER it;
	string::size_type position;
	for(it=this->_stuList.begin(); it!=_stuList.end(); )
    {
		Student stu=(* it);
		position= stu.GetName().find(likename);
		if(stu.GetName().npos != position )
        {
            cout<<stu.GetId()<<"    "<<stu.GetName()<<"    "<<stu.GetScore()<<endl;
			++it;
        }
        else
        {
            ++it;
        }
    }

}

void StudentManager::SaveFile( )
{
	 ofstream of("c:/1.txt");
	 
	STU_LIST_ITER iter;
	Student stu;
	for(iter=this->_stuList.begin();iter!=this->_stuList.end();++iter)
	{
		stu=(*iter);
		of<<stu.GetId()<<'\t'<<stu.GetName()<<'\t'<<stu.GetScore();
		if(iter!=this->_stuList.end()-1)//最后一行的换行符不加了。否则分割后有个空白行
		of<<'\n';
	} 

}

StudentManager& StudentManager::ReadFile()
{
	StudentManager* sm=new StudentManager;
	Student stu;
	char buf[1024];
	string message;
	ifstream ifile("c:/1.txt",ios::binary);
	 
	if(ifile)
	{
		 string sub_str;
		 stringstream ss;
		 stringstream ss2;//把变量统统提到变量外边
		while(ifile.good()&&!ifile.eof())
		{
			memset(buf,0,1024);
			ifile.getline(buf,1204);
			message = buf;    
			 
			ss<<message;
			int i=0;
			string stustring[3];
			 while(getline(ss,sub_str,'\t')) //以tab为间隔分割的内容
			 {  
				stustring[i]=sub_str;
				i++;
			 }

			  stu.SetId(atoi(stustring[0].c_str()));//转换
			   stu.SetName(stustring[1]);
			    stu.SetScore(atof(stustring[2].c_str()));
			  sm->AddStu(stu);
			  ss.clear();//清空
			 
		}
	}
return (*sm);
}

 

StudentManager::~StudentManager(void)
{
	_stuList.clear();
}

Student& StudentManager::FindByIndex(int index)
{
	return this->_stuList.at(index);
}

void StudentManager::EditByIndex(int index,int id,string name,double score)
{
	Student& stu=_stuList.at(index);
	stu.SetId(id);
	stu.SetName(name);
	stu.SetScore(score);
}

 

 

 

3 main

 

#include "Student.h"
#include "StudentManager.h"
#include <iostream>
#include <string>
using namespace std;

void main()
{
	StudentManager stum;
	cout<<"新增了三个学生"<<endl;
	Student stu(1,"sss",129);
	Student stu1(2,"aas",119);
	Student stu2(3,"dds",125.5);
	stum.AddStu(stu);//增
	stum.AddStu(stu2);
	stum.AddStu(stu1);
	stum.Display();//遍历
	cout<<"删了1个学生"<<endl;
	stum.DelStu(1);//删
	stum.Display();//遍历
	 cout<<"查找名字中含有s的学生"<<endl;
	stum.PrintStuByLikeName("s");//模糊查找
	stum.SaveFile();//保存到文件中

	 cout<<"保存文件后，load出来"<<endl;
	StudentManager stum2=	stum.ReadFile();//从文件中载入内存
	stum2.Display();
	 cout<<"修改下标为零的student后"<<endl;
	stum2.EditByIndex(0,999,"nyh",150.55);
	stum2.Display();
}