linklist.cpp

自己通过老师指导做的图书管理系统

#include "stdafx.h"
#include <iostream>
#include <strstream>
#include <sstream>
#include <fstream>
#include <string>
#include "Linklist.h"
#include "Date.h"
#include "Books.h"
LinkList::LinkList( )
{
	head=new Books;
	head->next=NULL;
}
LinkList::~LinkList( ){}//要求自己写出析构函数的实现部分，释放动态申请的内存空间
void LinkList::AddBooksArray(Books a[],int n)
{
	head= new Books;
	Books *r,*s;
	r=head;
	for(int i=0;i<n;i++)
	{
		s=new Books;
		*s=a[i];
		r->next=s;
		r=s;
	}
	r->next=NULL;
}
bool LinkList::IsEmpty()
{
	return 0;
	}
int LinkList::GetLength()
{
	Books *p=head->next;
	int i=0;
	while(p)
	{
		p=p->next;
		i++;
	}
	return i;
}

bool LinkList::AddBooks(Books *b)
{
	Books *p,*s;
	p=head->next;
	while(p!=NULL)
	{
		if(p->m_ID!=b->m_ID)
		{	s=p;
		    p=p->next;
		}
		else
		{  cout<<"有这本书"<<endl;
			return false;	     
		}
	}
    if(p==NULL)
	{  if(head->next==NULL)
	  { head->next=b;
	    b->next=NULL;
	   }
		else 
		{	s->next=b;
			b->next=NULL;
		}
	}
	return true;
}
Books * LinkList::SearchByID(string _id)
{
	int i=0;
	Books *p=head->next;
	while(p!=NULL &&p->m_ID!=_id)
	{
		p=p->next;
	}
	if(p==NULL)
	{
		cout<<"NO Found  "<<_id<<"的书籍"<<endl;
		return NULL;
	}
	else
	{
		return p;
	}
}
Books *LinkList::SearchByBookName(string _bookName)
{
	int i=0;
	Books *p=head->next;
	while(p!=NULL &&p->m_BookName!=_bookName)
	{
		p=p->next;
	}
	if(p==NULL)
	{
		cout<<"NO Found  "<<_bookName<<"的书籍"<<endl;
		return NULL;
	}
	else
	{
		return p;
	}
}
Books *LinkList:: SearchByAuthor(string  _author)
{
	int i=0;
	Books *p=head->next;
	while(p!=NULL &&p->m_Author!=_author)
	{
		p=p->next;
	}
	if(p==NULL)
	{
		cout<<"NO Found  "<<_author<<"的书籍"<<endl;
		return NULL;
	}
	else
	{
		return p;
	}
}
bool  LinkList::SaveList(char *fname)
{  ofstream fout(fname);
    if(fout.fail())
	{	cerr<<"error!";
         return false;
	}
  Books * p;
  p=head->next;
if(IsEmpty())
{      return false ;}
while(p)
{
fout<<*p;
p=p->next;
}   

fout.close();
return true;
}
bool LinkList::ReadList(char *fname)
{	ifstream fin(fname);
	if(fin.fail())
{
   cerr<<"error"<<endl;
return false;
}
Books *s;
string temp;
while(!fin.eof())
{   s=new Books;
  getline(fin,temp);
  istringstream istr(temp);
  istr>>*s;
  
   AddBooks(s);
}
fin.close();
return true;
}
void LinkList::displayLinkList()
{
	Books *p;
	p=head;
	do
	{
		cout<<p->next->m_ID<<"   "<<p->next->m_BookName<<"   "<<p->next->m_Author<<"   "<<p->next->m_press<<"   "<<p->next->m_publicDate<<"   "<<p->next->m_price<<endl;
		p=p->next;
	}while (p->next!=NULL);
}