library.cpp

图书管理系统 C**实现的 包括B树 可以参考一下呀 有需要联系我哈

#include "head.h"

void GetInformation(Record &book)
{
	/*printf("enter the name of the book:\n");
	getchar();
	gets(book.name);
	printf("enter the number of the book:\n");
	scanf("%d",&book.booknum);
	printf("enter the writer of the book:\n");
	getchar();
	gets(book.writer);
	printf("enter the total storage of the book:\n");
	scanf("%d",&book.total);

	book.current=book.total;*/
	strcpy(book.name,"happy");
	strcpy(book.writer,"sunny");
	book.total=5;
	book.current=book.total;
	printf("enter the number of the book:\n");
	scanf("%d",&book.booknum);
}
void PrintBookInfomation(Record *book)
{
	int i;
	printf("the booknum:%d\n",book->booknum);
	printf("name:%s\n",book->name);
	printf("writer:%s\n",book->writer);
	printf("total storage:%d,current storage:%d",book->total,book->current);
	for(i=0;i<book->total-book->current;i++)
		printf("\nNO.:%d   LIBRARYNUM:%s   RETURNDATE:%s",i+1,book->librarynum[i],book->returndate[i]);
}


void CopyBook(KeyType &k,Record book)
{
	int i;
	k.k=book.booknum;
	k.recptr=(Record *)malloc(sizeof(Record));
	k.recptr->booknum=book.booknum;
	k.recptr->current=book.current;
	k.recptr->total=book.total;
	strcpy(k.recptr->name,book.name);
	strcpy(k.recptr->writer,book.writer);
	for(i=0;i<book.total-book.current;i++)
	{
		strcpy(k.recptr->librarynum[i],book.librarynum[i]);
		strcpy(k.recptr->returndate[i],book.returndate[i]);
	}
}



void Procurement(BTree &T)
{
	Record book;
	Result result;

	KeyType k;
	GetInformation(book);
	
	result=SearchBTree(T,book.booknum);
	if(result.tag==0)
	{
	CopyBook(k,book);
	InsertBTree( T,k,result.pt,result.i);
	}
	else
	result.pt->key[result.i]->recptr->total++;
}

void DeleteBook(BTree &T,int k)
{
	DeleteBTree(T,k);
}

void Lending(BTree &T,int k,char librarynum[10],char returndate[10])
{
	Result result;

	BTree p;
	int i,j;
	result=SearchBTree(T,k);
	p=result.pt;
	i=result.i;

	if(result.tag==0)
	{
		printf("This book is not exited.\n");
		return;
	}
	if(result.pt->key[result.i]->recptr->current==0)
	{
		printf("This book is already borrowed.\n");
		return;
	}
	p->key[i]->recptr->current--;
	for(j=0;j<p->key[i]->recptr->total-p->key[i]->recptr->current;j++)
	{
		strcpy(p->key[i]->recptr->librarynum[j],librarynum);
		strcpy(p->key[i]->recptr->returndate[j],returndate);
	}
	PrintBookInfomation(p->key[i]->recptr);
}

void Return(BTree &T,int k,char *librarynum)
{
	Result result;
	BTree p;
	int i,j,n,current,total;
	result=SearchBTree(T,k);
	p=result.pt;
	i=result.i;
	current=p->key[i]->recptr->current;
	total=p->key[i]->recptr->total;

	for(j=0;j<=total-current;j++)
		if(p->key[i]->recptr->librarynum[j]==librarynum)
			break;
	for(n=j;n<total-current;n++)
	{
		strcpy(p->key[i]->recptr->librarynum[n],p->key[i]->recptr->librarynum[n+1]);
		strcpy(p->key[i]->recptr->returndate[n],p->key[i]->recptr->returndate[n+1]);
	}
	p->key[i]->recptr->current++;
	PrintBookInfomation(p->key[i]->recptr);
}