cpp1.cpp

一个学生教材管理系统。可以对教材进行添加、删除、修改、查询等操作

#include<iostream.h>
#include<fstream.h>
#include<stdlib.h>
#include<string.h>
struct textbook
{
  int id;
  char  textbookname[20];
  char  zhuanye[20];
  int   number;
};
void Append(fstream);
void Change(fstream);
void Inquire(fstream);
void CreateTxt(fstream);
void main()
{
 int choice;
 fstream iof("d:\\textbookFile.dat",ios::binary|ios::in|ios::out);
 if(! iof)
 {cerr<<"文件不能打开"<<endl;
 return;
 }
 while(1)
 {
   cout<<"************教材管理系统************"<<endl;
   cout<<"***(023210班) 薛晓川,姚曼曼,李萍,廖笛***"<<endl;
   cout<<"    ********请键入操作选择*********     "<<endl;
   cout<<"      ******1.录入教材信息*******       "<<endl;
   cout<<"      ******2.修改教材信息*******       "<<endl;
   cout<<"      ******3.查询浏览信息*******       "<<endl;
   cout<<"      ******4.打印教材信息*******       "<<endl;
   cout<<"      ******0.退出信息系统*******       "<<endl;
   cin>>choice;
   switch(choice)
   {
   case 1: Append(iof);break;
   case 2: Change(iof);break;
   case 3: Inquire(iof);break;
   case 4: CreateTxt(iof);break;
   case 0: cout<<"退出系统\n";return;
   default : cout<<"输入错误，请再输入\n";
   }
 }
 iof.close();
}
void Append(fstream f)
{
 int choice;
 textbook book;
 int key;
  f.seekp(0,ios::end);    //读指针移到文件末尾
 long posEnd=f.tellp();   //记录文件尾位置
 cout<<"************录入教材信息************\n";
 while(1)
 {
   cout<<"请键入操作选择\n"
	   <<"1:录入信息"
	   <<"0:退出\n";
   cin>>choice;
   switch(choice)
   {
   case 1:                //追加新记录
	   {
	     cout<<"编号,教材名,专业,数量:\n编号:  ";
		 cin>>book.id;
		 cout<<"教材名:  ";
		 cin>>book.textbookname;
		 cout<<"专业:  ";
		 cin>>book.zhuanye;
		 cout<<"数量:  ";
		 cin>>book.number;
                 f.write((char *)& book,sizeof(textbook));
		 break;
           };
   case 0:return;
}
 }
}

void Change(fstream f)          //修改操作
{
 int choice;
 textbook book;
 int key;
 int ch,m;
 int id;
 char textbookname[20];
 char zhuanye[20];
 int number;
 f.seekp(0,ios::end);              //读指针移到文件末尾
 long posEnd=f.tellp();            //记录文件尾位置
 cout<<"************修改教材信息************\n";
 while(1)
 {
   cout<<"请键入操作选择\n"
	   <<"1:修改教材信息\t"
	   <<"0:退出\n";
   cin>>choice;
   switch(choice)
   {
   case 1:
	   {
	     {f.seekp(0,ios::beg);              //文件头开始检索
	      cout<<"请输入要修改的教材的编号:";
		  cin>>key;
		  do
		  {
		    f.read((char *)& book,sizeof(textbook));
		  }while(book.id!=key&&f.tellp()!=posEnd);
		    cout<<"编号"<<'\t'<<"教材名"<<'\t'<<"专业"
		     <<'\t'<<"数量"<<endl;
		  if(book.id==key)
		  {
		   cout<<book.id<<'\t'<<book.textbookname
			   <<'\t'<<book.zhuanye<<'\t'
			   <<book.number<<endl;
		     cout<<"****你确定要修改吗?*****"<<endl;
			 cout<<"1.修改"<<'\t'<<"0.退出"<<endl;			  
			 cin>>ch;
			  switch(ch)
			  {
			  case 1: 
				  {  cout<<"**请选择修改选项**"<<endl;
				     cout<<"1.修改编号"<<'\t'<<"2.修改书名"<<'\t'<<"3.修改专业"
						 <<'\t'<<"4.修改数量"<<'\t'<<"0.退出"<<endl;
					     cin>>m;
					  switch(m)
					  {
					  case 1:
						  {
					        cout<<"编号改为:";
				            cin>>id;
				            book.id=id;
							cout<<"修改成功!!"<<endl;goto f1;
						  }
	          case 2:
						  {
				           cout<<"书名改为:";
				           cin>>textbookname;
				           strcpy(book.textbookname,textbookname);
						   cout<<"修改成功!!"<<endl;goto f1;
						  }
			  case 3:
						  {
							  cout<<"专业改为:";
							  cin>>zhuanye;
							  strcpy(book.zhuanye,zhuanye);
							  cout<<"修改成功!!"<<endl;goto f1;
						  }
			  case 4:
						  {
							  cout<<"数量改为:";
							  cin>>number;
							  book.number=number;
							  cout<<"修改成功!!"<<endl;goto f1;
						  }
					  case 0:
						  return;
					  }
				  }
			  case 0: return;
			  }  
f1: f.seekp(-long(sizeof(textbook)),ios::cur);    //指针复位
			  f.write((char*)&book,sizeof(textbook));     //写入文件
            
		  } 
		  else
			  cout<<"编号输入错误\n";
		  break;
		}
 }
   case 0: return;
	   }
 }
}

void Inquire(fstream f)  //查询记录
{
 int choice;
 textbook book;
 int key;
 char name[20];
 f.seekp(0,ios::end);      //读指针移到文件末尾
 long posEnd=f.tellp();    //记录文件尾位置
 cout<<"************查询教材信息************\n";
 while(1)
 {
   cout<<"请键入操作选择\n"
	   <<"1:按编号查询\t"
	   <<"2:浏览\t"
	   <<"3.统计现有教材数量\t"
	   <<"0:退出\n";
   cin>>choice;
   switch(choice)
   {
   case 1:                //按编号检索
	   {
	     {f.seekp(0,ios::beg);
	      cout<<"编号:";
		  cin>>key;
		  do
		  {
		    f.read((char *)&book,sizeof(textbook));
		  }while(book.id!=key&&f.tellp()!=posEnd);
		  if(book.id==key)
		  {cout<<"编号"<<'\t'<<"教材名"<<'\t'<<"专业"
		       <<'\t'<<"数量"<<endl;
		   cout<<book.id<<'\t'<<book.textbookname
			   <<'\t'<<book.zhuanye<<'\t'
			   <<book.number<<endl;
		  }
		  else
		  {cout<<"编号输入错误\n";
		       continue;
		  }
		  break;
                  }
   case 2:                  //浏览文件
	   {
		   f.seekg(0,ios::beg);
		   cout<<"编号"<<'\t'<<"教材名"<<'\t'<<"专业"
		     <<'\t'<<"数量"<<endl;
		   do                      //输出所有记
		   { f.read((char*)&book,sizeof(textbook)); 
		  	cout<<book.id<<'\t'<<book.textbookname
			   <<'\t'<<book.zhuanye<<'\t'
			   <<book.number<<endl;
		   }while(book.id!=key&&f.tellp()!=posEnd);
		   break;
	   }
   case 3:
	   {   
           int number=0;
		   f.seekg(0,ios::beg);
		   cout<<"编号"<<'\t'<<"教材名"<<'\t'<<"专业"
		     <<'\t'<<"数量"<<endl;
		   do
		   { f.read((char*)&book,sizeof(textbook)); 
		  		cout<<book.id<<'\t'<<book.textbookname
			        <<'\t'<<book.zhuanye<<'\t'
			        <<book.number<<endl;
				number+=book.number;
		   }while(book.id!=key&&f.tellp()!=posEnd);
		   cout<<"现有教材数量为:"<<number<<endl;
		   break;
	   }
case 0: return;
 }
 }
}
}

void CreateTxt(fstream f)        //建立文本文件,可打印
{
	fstream ftxt("d:\\textbookFile.txt",ios::out);    //写方式找开文本文件
	textbook book;
	f.seekg(0,ios::end);
	long posEnd=f.tellg();              //记录二进制文件尾位置
	f.seekg(0,ios::beg);                //移动读指针到文件头
	cout<<"************建立文本文件************\n";
	do
	{
	  f.read((char*)&book,sizeof(textbook));
	  ftxt<<book.id<<'\t'<<book.textbookname<<'\t'<<book.zhuanye
		  <<'\t'<<book.number<<endl;
	}while(f.tellg()!=posEnd);
	ftxt.close();
	cout<<"文本文件已建立，要浏览文件吗？(Y/N)\n";
	char answer,s[200];
	cin>>answer;
	if(answer='Y'||answer=='y')
	{
		ftxt.open("d:\\textbook.txt",ios::in);   //重用流打开文件
		while(!ftxt.eof())                  //按行显示文本文件
		{
		  ftxt.getline(s,200);            
		  cout<<s<<endl;
		}
	}
	ftxt.close();
}