student copy.cpp

本程序是自己写的一个关于学生管理系统,实现了查看所有学生信息,查找学生,删除学生,输入学生(按学号大小排列)功能.希望大家参考,指出需改进之处.

#include <iostream.h>
#include <fstream.h>
#include  <stdlib.h>
#include <string.h>
#include <stdio.h>


struct Stu
{
	long NO;
	char name[15];
	char sex;
	int Class;
};

class Student
{
public:
//	long NO;
//	char name[25];
//	char sex;
//	int Class;

	//void read_Init_student_data(Student *stu,int n);
	void read_keyboard_student_date();
	void find_from_student_no();
	void find_from_student_name();
	void delete_from_student_no();
	void delete_from_student_name();

};

//===========================================================================
    /*读初始的学生个人信息:*/
//===========================================================================

/*
void read_Init_student_data(Stu *stu,int n)
{
	cout<<"Reading main's three student..."<<endl;
	ofstream outfile("f3.txt",ios::binary);
    if(!outfile)
	{
		cerr<<"outfile error!"<<endl;
		exit(1);
	}
	for(int i=0;i<4;i++)
		outfile.write((char*)&stu[i],sizeof(stu[i]));
    
    ifstream infile("f3.txt",ios::in);
    if(!infile)
	{
		cerr<<"infile error!"<<endl;
		exit(1);
	}
	for(int j=0;j<3;j++)
	{
		//infile.read((char*)&stu[j],sizeof(stu[j]));
		infile.read((char*)&stu[j],sizeof(stu[j]));
		cout<<stu[j].NO<<" "<<stu[j].name<<" "<<stu[j].sex<<" "<<stu[j].Class<<endl;
	}
	infile.close();
	outfile.close();
}
*/

//====================================================================
   /*读入从键盘输入的学生个人信息:*/
//====================================================================

void Student::read_keyboard_student_date()
{
	Stu stud;
	Stu studtemp;
	//统计结构体中学生的个数:
	//=====================================================
	int flags=0;
	ifstream ifile("f3.txt",ios::binary);
	ofstream ofile("temp2.txt",ios::binary);
	ifile.read((char*)(&studtemp),sizeof(studtemp));
	while(!ifile.eof())
	{
		ofile.write((char*)(&studtemp),sizeof(studtemp));
		ifile.read((char*)(&studtemp),sizeof(studtemp));
		flags+=1;
	}
	ifile.close();
	ofile.close();
	//=====================================================

	ifstream infile("f3.txt",ios::binary);
	ofstream temp_outfile("temp1.txt",ios::binary);


	    cout<<">>请输入你要输入的学生信息:"<<endl;
A:		cout<<"NO,name,sex,Class:";
		cin>>stud.NO>>stud.name>>stud.sex>>stud.Class;

//		Stu studtemp;
//		ifstream infile("f3.txt",ios::binary);
		int flags1=1;
		int flags2=0;
		int flags3=0;
		infile.read((char*)(&studtemp),sizeof(studtemp));
		while(!infile.eof())
		{
			if(stud.NO==studtemp.NO)
			{
				cout<<">>此学号已经存在,请重新输入学生信息:"<<endl;
				goto A;
			}
//按学号的大小由小到大排序:
//hy1=========================================================================
		    else if(stud.NO > studtemp.NO)
			{
				temp_outfile.write((char*)(&studtemp),sizeof(studtemp));
				flags2+=1;
				flags3+=1;
			}
			else
				if(flags1==1)
				{
					temp_outfile.write((char*)(&stud),sizeof(stud));
					flags1=0;
					flags3+=1;
				}
			if(flags1==0)
				temp_outfile.write((char*)(&studtemp),sizeof(studtemp));
			if(flags2==flags)
				temp_outfile.write((char*)(&stud),sizeof(stud));
			infile.read((char*)(&studtemp),sizeof(studtemp));
//hy1========================================================================
		}
		if(flags3==0)
			temp_outfile.write((char*)(&stud),sizeof(stud));
		infile.close();
		temp_outfile.close();


/*		Stu studtemp1;

		infile.read((char*)(&studtemp1),sizeof(studtemp1));
        while(!infile.eof())
		{
			if(stud.NO < studtemp1.NO)
			{
				temp_outfile.write((char*)(&stud),sizeof(stud));
				temp_outfile.write((char*)(&studtemp1),sizeof(studtemp1));
			}
			else
			{
				temp_outfile.write((char*)(&studtemp1),sizeof(studtemp1));
			}

			infile.read((char*)(&studtemp1),sizeof(studtemp1));
		}
//		outfile.write((char*)(&stud),sizeof(stud));
    	temp_outfile.close();
		*/

 //       Stu studtemp2;
        ifstream temp_infile("temp1.txt",ios::binary);
		ofstream outfile("f3.txt",ios::binary);
        
		temp_infile.read((char*)(&studtemp),sizeof(studtemp));
		while(!temp_infile.eof())
		{
//			temp_infile.read((char*)(&studtemp2),sizeof(studtemp2));
			outfile.write((char*)(&studtemp),sizeof(studtemp));
			temp_infile.read((char*)(&studtemp),sizeof(studtemp));
		}
		
		temp_infile.close();
		outfile.close();
		cout<<">>输入信息成功!"<<endl;


/*	ofstream outfile("f3.txt",ios::app | ios::binary);
	cout<<"Please input a student information:"<<endl;
    cout<<"NO,name,sex,Class:";
	cin>>stud.NO>>stud.name>>stud.sex>>stud.Class;
	outfile.write((char*)(&stud),sizeof(stud));
	outfile.close();*/
/*	char ch;
    cout<<">>是否要显示所有学生信息(Y/N):";
	cin>>ch;
	if(ch=='Y' || ch=='y')
	{
		ifstream infile("f3.txt",ios::binary);
		if(!infile)
		{
			cerr<<"infile error!"<<endl;
			exit(1);
		}
		cout<<">>已有的所有学生的信息如下:"<<endl;
		infile.read((char*)(&stud),sizeof(stud));
		while(!infile.eof())
		{
			cout<<stud.NO<<" "<<stud.name<<" "<<stud.sex<<" "<<
				stud.Class<<endl;
			infile.read((char*)(&stud),sizeof(stud));
		}
		infile.close();
	}
	*/
}

//=================================================================
           /*按学号查找学生信息*/
//=================================================================

void Student::find_from_student_no()
{
	long num;
	cout<<">>输入你要查找的学生号:";
	cin>>num;

	Stu studtemp;
    ifstream infile("f3.txt",ios::binary);
	infile.read((char*)(&studtemp),sizeof(studtemp));
	while(!infile.eof())
	{
		if(num==studtemp.NO)
		{
			cout<<">>你要找的学生信息是:";
			cout<<studtemp.NO<<" "<<studtemp.name<<" "<<studtemp.sex<<" "<<
				studtemp.Class<<endl;
			break;
		}
		infile.read((char*)(&studtemp),sizeof(studtemp));
	}
	if(num!=studtemp.NO)
		cout<<">>对不起,没有你要找的学生信息!"<<endl;
	infile.close();
}

//=================================================================
           /*按姓名查找学生信息*/
//=================================================================

void Student::find_from_student_name()
{
//***********************************
	char nametemp[15];
	cout<<">>输入要查找的学生名字:";
	cin>>nametemp;
//	cin.getline(nametemp,15);
//***********************************
//	cout<<nametemp;
	cout<<">>输入你要查找的学生姓名:";
	int flag1=1;
	int flag2=0;
	Stu studtemp;
    ifstream infile("f3.txt",ios::binary);
	infile.read((char*)(&studtemp),sizeof(studtemp));
	while(!infile.eof())
	{
		if(strcmp(nametemp,studtemp.name)==0)
		{
			flag2++;
			if(flag1==1)
			{
				cout<<">>你要找的学生信息是:";
				flag1--;
			}
			cout<<studtemp.NO<<" "<<studtemp.name<<" "<<studtemp.sex<<" "<<
				studtemp.Class<<endl;
		}
		infile.read((char*)(&studtemp),sizeof(studtemp));
	}
	if(flag2==0)
		cout<<">>对不起,没有你要找的学生信息!"<<endl;
	infile.close();
}

//=================================================================
           /*按学号删除某学生信息*/
//=================================================================

void Student::delete_from_student_no()
{
	int flags=0;
	ifstream infile("f3.txt",ios::binary);
	ofstream outfile("temp.txt",ios::binary);
	long num;
	cout<<">>输入你要删除的学生号:";
	cin>>num;

	Stu studtemp;
	infile.read((char*)(&studtemp),sizeof(studtemp));
	while(!infile.eof())
	{
		if(num==studtemp.NO)
		{
			cout<<">>你要删除的学生信息是:";
			cout<<studtemp.NO<<" "<<studtemp.name<<" "<<studtemp.sex<<" "<<
				studtemp.Class<<endl;
			flags=1;
		}
		else
			outfile.write((char*)(&studtemp),sizeof(studtemp));
		infile.read((char*)(&studtemp),sizeof(studtemp));
	}
//	if(num!=studtemp.NO)
//		cout<<">>没有你要删除的学生信息!"<<endl;
	infile.close();
    outfile.close();
	char ch3;
	if(flags==1)
	{
		cout<<">>你是否真要删除此学生信息?(Y/N):";
		cin>>ch3;
	}
	
	if((flags==1) && (ch3 == 'Y' || ch3 == 'y'))
	{
		ifstream infile("temp.txt",ios::binary);
		ofstream outfile("f3.txt",ios::binary);
		infile.read((char*)(&studtemp),sizeof(studtemp));
		while(!infile.eof())
		{
			outfile.write((char*)(&studtemp),sizeof(studtemp));
			infile.read((char*)(&studtemp),sizeof(studtemp));
		}
		cout<<">>删除成功!"<<endl;
		infile.close();
        outfile.close();
	}
	if(flags==0)
	{
		cout<<">>对不起,没有你要删除的学生信息!"<<endl;
	}
}

//=================================================================
           /*按姓名删除某学生信息*/
//=================================================================

void Student::delete_from_student_name()
{
	int flags=0;
	int flag1=1,flag2=0;
	ifstream infile("f3.txt",ios::binary);
	ofstream outfile("temp.txt",ios::binary);
//******************************
	cout<<">>输入你要删除的学生姓名:";
    char find_name[15];
	cin>>find_name;
//	cin.getline(find_name,15,'\n');
//  char ch;
//	while((ch=getchar())!='\n')
//		cout<<ch;

//******************************

	Stu studtemp;
	infile.read((char*)(&studtemp),sizeof(studtemp));
	while(!infile.eof())
	{
		if(strcmp(find_name,studtemp.name)==0)
		{
			if(flag1==1)
			{
				cout<<">>你要删除的学生信息是:";
				flag1--;
			}
			cout<<studtemp.NO<<" "<<studtemp.name<<" "<<studtemp.sex<<" "<<
				studtemp.Class<<endl;
			flags=1;
			flag2++;
		}
		else
			outfile.write((char*)(&studtemp),sizeof(studtemp));
		infile.read((char*)(&studtemp),sizeof(studtemp));
	}
//	if(num!=studtemp.NO)
//	cout<<">>没有你要删除的学生信息!"<<endl;
	infile.close();
    outfile.close();
	char ch3;
	if(flags==1)
	{
		cout<<">>你是否真要删除这<<flag2<<个学生信息?(Y/N):";
		cin>>ch3;
	}
	
	if((flags==1) && (ch3 == 'Y' || ch3 == 'y'))
	{
		ifstream infile("temp.txt",ios::binary);
		ofstream outfile("f3.txt",ios::binary);
		infile.read((char*)(&studtemp),sizeof(studtemp));
		while(!infile.eof())
		{
			outfile.write((char*)(&studtemp),sizeof(studtemp));
			infile.read((char*)(&studtemp),sizeof(studtemp));
		}
		cout<<">>删除成功!"<<endl;
		infile.close();
        outfile.close();
	}
	if(flags==0)
	{
		cout<<">>对不起,没有你要删除的学生信息!"<<endl;
	}
}

void main()
{
/*	Stu stu[3]=
	{
		{2007001,"huangyoun",'M',1},
		{2007002,"xuqian",'F',1},
		{2007003,"xiezhonghua",'M',2}
	};
*/
	int x;

A:	cout<<">>欢迎使用学生管理系统!请选择你要的服务:"<<endl;
	cout<<"=>显示所有学生信息请选择 1 "<<endl;
	cout<<"=>输入学生信息请选择 2 "<<endl;
    cout<<"=>查找某学生信息请选择 3 "<<endl;
    cout<<"=>删除某学生信息请选择 4 "<<endl;
	cout<<"=>退出此系统请选择 5 "<<endl;
	cout<<">>你将选择?(1/2/3/4/5):";
	cin>>x;

	Student ST;
//	read_Init_student_data(stu,3);
	if(x==2)
	{
		char ch_read;
B:		ST.read_keyboard_student_date();
		cout<<">>是否还要输入?(Y/N):";
		cin>>ch_read;
		if(ch_read=='Y' || ch_read=='y')
			goto B;
		else
		{
			x=0;
			goto A;
		}
	}
	if(x==1)
	{
		Stu stud;
//		cout<<strlen(Stu);
		
		ifstream infile("f3.txt",ios::binary);
		if(!infile)
		{
			cerr<<"infile error!"<<endl;
			exit(1);
		}
		cout<<">>已有的所有学生的信息如下:"<<endl;
		cout<<"  学号   姓名   性别   班级"<<endl;
		infile.read((char*)(&stud),sizeof(stud));
		while(!infile.eof())
		{
			cout<<stud.NO<<" "<<stud.name<<" "<<stud.sex<<" "<<
				stud.Class<<endl;
			infile.read((char*)(&stud),sizeof(stud));
		}
		infile.close();
		x=0;
		goto A;
	}

	if(x==3)
	{
		char ch_find;
		char ch2;
		cout<<">>按学号(X)查找还按名字(M)查找?(X/M):";
		cin>>ch2;
	
		if(ch2=='X' || ch2=='x')
		{
C:			ST.find_from_student_no();
			cout<<">>是否还要查找?(Y/N):";
			cin>>ch_find;
			if(ch_find=='Y' || ch_find=='y')
				goto C;
			else
			{
				x=0;
				goto A;
			}
		}
		if(ch2=='M' || ch2=='m')
		{
D:			ST.find_from_student_name();
			cout<<">>是否还要查找?(Y/N):";
			cin>>ch_find;
			if(ch_find=='Y' || ch_find=='y')
				goto D;
			else
			{
				x=0;
				goto A;
			}
		}
	}

  //  ST.delete_from_student_no();
	if(x==4)
	{
		char ch_delete;
		char ch4;
		cout<<">>按学号(X)删除还按名字(M)删除?(X/M):";
		cin>>ch4;
		
		if(ch4=='X' || ch4=='x') 
		{
E:			ST.delete_from_student_no();
			cout<<">>是否还要删除?(Y/N):";
			cin>>ch_delete;
			if(ch_delete=='Y' || ch_delete=='y')
				goto E;
			else
			{
				x=0;
				goto A;
			}
		}
		if(ch4=='M' || ch4=='m') 
		{
F:			ST.delete_from_student_name();
			cout<<">>是否还要删除?(Y/N):";
			cin>>ch_delete;
			if(ch_delete=='Y' || ch_delete=='y')
				goto F;
			else
			{
				x=0;
				goto A;
			}
		}
	}

	if(x==5)
	{
		x=0;
		goto G;
	}



G:	cout<<">>谢谢使用!"<<endl;
}