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系統專案：學習STL之後，編寫一個學生資訊系統，實現簡單的增、刪、查、改等等功能

類標頭檔案——Student.h

// Student.h: interface for the CStudent class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_STUDENT_H__18055DAC_8015_4944_AF62_E78B8EBB233D__INCLUDED_)
#define AFX_STUDENT_H__18055DAC_8015_4944_AF62_E78B8EBB233D__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include <string>
#include <vector>
using namespace std;

class CStudent  
{
private:
	int StudentNumber;
	string StudnetName;
        vector<CStudent *> student;
	vector<CStudent> student2;

public:
	CStudent();
	virtual ~CStudent();
	CStudent(int StudentNumber,string StudnetName);

        void add_student();              //增加學生資訊
	void print_student();            //列印學生資訊------->（All）
	void print();

	bool operator<(CStudent &stu);  //過載學生學號比較大小
        void SortStudent();              //給學生資訊排序

	bool operator()(CStudent &other);  //過載函式，模擬回撥函式
	void FindStudent();              //查詢某個學生資訊
    
	void DeleteAllStudent();         //刪除所有學生資訊--->（All）
	void DeleteOneStudent();         //刪除一個學生

};

#endif // !defined(AFX_STUDENT_H__18055DAC_8015_4944_AF62_E78B8EBB233D__INCLUDED_)
 

// Student.cpp: implementation of the CStudent class.
//
//////////////////////////////////////////////////////////////////////

#include "Student.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CStudent::CStudent()
{

}

CStudent::~CStudent()
{
        cout<<"呼叫解構函式."<<endl;
	return ;
}
CStudent::CStudent(int StudentNumber,string StudnetName)
{
	this->StudentNumber=StudentNumber;
	this->StudnetName=StudnetName;
	return ;
}

void CStudent::add_student()              //增加學生資訊
{
    cout<<"增加學生."<<endl;
    int number;
	string name;
	cout<<"學生學號:";
	cin>>number;
	cout<<"學生姓名:";
	cin>>name;

    CStudent stu(number,name);
    student2.push_back(stu);

	return ;
}
void CStudent::print()
{
	cout<<"學號:"<<this->StudentNumber<<"姓名:"<<this->StudnetName<<endl;
	return ;
}
void CStudent::print_student()                                   //列印學生資訊------->（All）
{ 
    cout<<"列印所有學生的資訊."<<endl;
    for(vector<CStudent>::iterator it=student2.begin();it!=student2.end();it++)  //容器從頭遍歷到尾，end是最後一個元素的後一個
	{
		(*it).print();
	}
	return ;
}

bool CStudent::operator<(CStudent &stu)                         //過載學生學號比較大小
{
    return StudentNumber<stu.StudentNumber;
}

void CStudent::SortStudent()                                    //給學生資訊排序
{
        sort(student2.begin(),student2.end());               //sort演算法，要增加標頭檔案algorithm；預設從小到大排，預設呼叫operator< ()過載函式
	for(vector<CStudent>::iterator it=student2.begin();it!=student2.end();it++)
	{
         (*it).print();	
	}
	cout<<endl;
	return ;
}

bool CStudent::operator()(CStudent &other)  //過載函式，模擬回撥函式
{
       bool flag;
       if(this->StudentNumber==other.StudentNumber||this->StudnetName==other.StudnetName)
	{
	         flag=true;	
	}
	else
	{
		flag=false;
	}
	return flag;
}

void CStudent::FindStudent()                 //查詢某個學生資訊
{
	int number;
	string name;
	cout<<"學生學號:";
	cin>>number;
	cout<<"學生姓名:";
	cin>>name;
	
        CStudent stu(number,name);

        vector<CStudent>::iterator result=find_if(student2.begin(),student2.end(),stu);
	if(result!=student2.end())
	{
		cout<<"Find it:\t";
		(*result).print();
	}
	cout<<endl;
	return ;
}

void CStudent::DeleteAllStudent()             //刪除所有學生資訊--->（All）
{
        student.clear();
	return ;
}

void CStudent::DeleteOneStudent()              //刪除一個學生
{
	int number;
	string name;

	cout<<"學生學號:";
	cin>>number;
	cout<<"學生姓名:";
	cin>>name;

        CStudent stu(number,name);
	vector<CStudent>::iterator result=find_if(student2.begin(),student2.end(),stu);	//預設呼叫operator()括號過載函式
	if(result!=student2.end())
	{
		student2.erase(result);                                                 //刪除位置
	}

    cout<<endl;
}
 

#include "Student.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;


int main()
{
	int flag;
	CStudent s;

	while(1)
	{
		cout<<"1--增加學生資訊."<<endl;
		cout<<"2--列印學生資訊."<<endl;
		cout<<"3--按學號查詢學生資訊."<<endl;
		cout<<"4--刪除全部學生資訊"<<endl;
		cout<<"5--刪除指定學生資訊."<<endl;
		cout<<"6--學生資訊排序."<<endl;
		cout<<"0--退出系統."<<endl;

		cin>>flag;
		switch(flag)
		{

		case 1:
			cout<<"增加學生資訊."<<endl;
			s.add_student();
			break;

		case 2:
                        cout<<"列印學生資訊."<<endl;
			s.print_student();
			break;

		case 3:
			cout<<"按學號查詢學生資訊:"<<endl;	
                        s.FindStudent();
                        break;

		case 4:
			cout<<"刪除全部學生資訊"<<endl;
		    s.DeleteAllStudent();
			break;

		case 5:
			cout<<"刪除指定學生資訊,輸入學生學號:"<<endl;
			s.DeleteOneStudent();
			break;

		case 6:
			cout<<"學生資訊排序."<<endl;
			s.SortStudent();
			break;

		case 0:
			cout<<"退出系統."<<endl;
			return 1;

		default:
			break;
		}
	}
	return 0;
}