student.cpp

学生管理系统

// tongxunlu000.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <string>
#include <iostream>
#include <fstream>
#include <conio.h>
#include <stdio.h>

const int size=100;  //定义记录总数
using namespace std;

class Student              //定义通讯录的类   
{
private:
	char StuName[20];
	int StuScore;
public:
	friend class function;	//定义友员类
	void display() //显示记录
	{
			cout << "   姓名：" <<  StuName<< endl;
		    cout << "   成绩：" <<StuScore<<endl;
	}
};

class function // 定义功能类
{
private:
      Student stu[size];	 //数组型对象
public:
	int TotalRecords;       //当前记录总数
	function()              //记录总数赋初值
	{
		TotalRecords=0;    
	}
	~function()               //记录总数归零
	{
		TotalRecords=0;
	}
	void countrecord()          //计算当前记录总数
	{
		fstream f1;
		f1.open("record.dat",ios::in|ios::out);
		f1.seekg(0,ios::end);
		TotalRecords=f1.tellg()/sizeof(Student);		
		f1.close();
	}
	void Pause()            //暂停
	{
		cout << "按任意键返回主菜单......" << endl;
		char ch;
		ch=getch();
	    Contents();
	    mainselect();
	}

	void write() //写入数据
	{    
		system("cls");
		ofstream of1;
		of1.open("record.dat",ios::app);
		countrecord();
		char ch;
		while(true)
		{
			//判断记录的空余空间
			TotalRecords++;
			if (TotalRecords>size)
			{
				cout <<"存储空间已满！";
				TotalRecords--;			
			}	
			//写入数据
		
		    cout << "请输入姓名：";
		    cin >> stu[TotalRecords].StuName;
		    cout <<"请输入成绩：";
	     	cin >>stu[TotalRecords].StuScore;
	    
			of1.write((char *)&stu[TotalRecords],sizeof(Student));
			cout << "还继续输入吗(y/n)?";
			cin >> ch;
			if(ch!='y' && ch!='Y')
			{
			of1.close();
            Contents();
		    mainselect();
			}
		}		
	}

void browser()//显示记录
	{			
	    system("cls");		
		ifstream f1;
	//	countrecord();
		f1.open("record.dat");
		f1.seekg(0,ios::beg); //指针回到文件按记录首部	
		if(TotalRecords>0 && TotalRecords<size)
		{
	  	   for(int i=1;i<=TotalRecords;i++)
		   {
			f1.read((char *)&stu[i],sizeof(Student));
			cout << "记录号：" << i <<endl;
			stu[i].display();
			cout << endl;
		   }
		}
		else 
		{
			cout<<"当前记录为空！\n";
		}
		f1.close();     		
		Pause();				


		
	}
	
	void inquire() //查找
	{
		Student stu[size];
		ifstream f1;	
		f1.open("record.dat");
		f1.seekg(0,ios::beg); //指针回到文件按记录首部	
		if(TotalRecords>0 && TotalRecords<size)
		{
	  	   for(int i=1;i<=TotalRecords;i++)
		   {
			f1.read((char *)&stu,sizeof(Student));		
		   }
		}
		
		system("cls");
		char name[10];  //当前记录号	  
	
	//	f1.open("record.dat",ios::in|ios::out);
		f1.seekg(0,ios::end);
		TotalRecords=f1.tellg()/sizeof(Student);
		cout <<TotalRecords<<endl;
		cout <<f1.tellg();
		cout << "输入要查找的姓名:";
		cin >> name;
		for(int i=1;i<=TotalRecords;i++)
		{				
			if(strcmp(name,stu[i].StuName)==0)
			{	
				 cout <<"yes";
		         f1.seekg((i-1)*sizeof(Student),ios::beg);
		         f1.read((char *)&stu,sizeof(Student));
		         stu[i].display();
			}
		}
		f1.close();

		Pause();		
	}

	void Contents()  //主目录
	{ 
		system("cls");
	    cout << "\t\t*" << "************************************************" << endl;
		cout << "\t\t*" << "    1． 浏览通讯录信息，             "<< "*" << endl;
	    cout << "\t\t*" << "    2． 增加通讯录信息，             "<< "*"<< endl;	  
	    cout << "\t\t*" << "    3． 按姓名号查询通讯录信息       "<< "*" << endl;
	    cout << "\t\t*" << "    0.  退出通讯录，                 "<< "*" <<endl;
		cout << "\t\t*" << "************************************************" << endl;
		cout << "\t\t请选择（0-3）：";        
	}
   void mainselect()  //功能选择
   {
       char x[4];
       cin>>x[0];
       switch(x[0])
           {
            case '1': //浏览功能
				 browser();
                 break;
            case '2': //增加新记录
                 write();
                 break;         
            case '3':
                 inquire(); //查找记录
                 break;          
            case '0': //退出系统				 
				 cout <<"确定退出？（y/n）\n";
				 char ch;
				 ch=getch();
				 if(ch=='y'||ch=='Y')
				 {                
				  cout <<"欢迎使用，再见！\n"; 
				  exit(0);
				 }
				 else
				 {
					 	Contents();
	                	mainselect();
				 }
            default:
                 {   
                 cout<<"请原谅，您的输入有误"<<endl;      
                 mainselect();
                 } 
          }  
   }
};

int main()
{
	cout <<"\t\t\t——欢迎使用通讯录系统——\n";
	 function stu;
	stu.countrecord();
	stu.Contents();
    stu.mainselect();
	return 0;
}