search.cpp

本源码为C++版的图书馆管理系统

# include <iostream.h>
# include <string>
# include <math.h>
# include <stdio.h>
# include <malloc.h>


//书号查询
int BinSearch(BnoIdxFile &bif,char key[5])
{
	int low,high,mid;
	low=1;
	high=bif.len;
	while(low<=high)
	{
		mid=(low+high)/2;
		if(strcmp(key,bif.BnoIdx[mid].bno)==0)
			return bif.BnoIdx[mid].RecNo;
		else if(strcmp(key,bif.BnoIdx[mid].bno)<0)
			high=mid-1;
		else
			low=mid+1;
	}
	return 0;
}

//书名查询
int BnameFind(LHFile1 &lhf1,char key[21])
{
	int i,k=0;
	for(i=1;i<=lhf1.len1;i++)
	{
		if(strcmp(key,lhf1.LHFrec1[i].bname)==0)
		{
			k=lhf1.LHFrec1[i].lhead;break;
		}
	}
		return k;
}

//作者查询
int BauthFind(LHFile2 &lhf2,char key[9])
{
	int i,k=0;
	for(i=1;i<=lhf2.len2;i++)
	{
		if(strcmp(key,lhf2.LHFrec2[i].author)==0)
		{
			k=lhf2.LHFrec2[i].lhead;break;
		}
	}
		return k;
}

//出版社查询
int BpressFind(LHFile3 &lhf3,char key[11])
{
	int i,k=0;
	for(i=1;i<=lhf3.len3;i++)
	{
		if(strcmp(key,lhf3.LHFrec3[i].press)==0)
		{
			k=lhf3.LHFrec3[i].lhead;break;
		}
	}
		return k;
}

//输出一条图书主数据记录
void ShowRec(BookDbaseFile &df,int i)
{
	cout<<"书号      书名       作者      出版社      分类号"<<endl;
	cout<<"================================================="<<endl;
	cout<<df.BookDbase[i].bno<<"     "<<df.BookDbase[i].bname<<"      ";
	cout<<df.BookDbase[i].author<<"      "<<df.BookDbase[i].press<<"      "<<df.BookDbase[i].storenum<<endl;
	cout<<"================================================="<<endl;
}

//图书查询控制程序
void SearchBook(BookDbaseFile &df,BnoIdxFile &bif,LHFile1 &f1,LHFile2 &f2,LHFile3 &f3)
{
	char sh[21],sm[5],zz[9],cbs[11];
	int i,k,choose=1;
	while(choose>=1 && choose<=5)
	{
		cout<<"图书查询字系统"<<endl;
		cout<<"--------------"<<endl;
		cout<<"1.书号  2.书名"<<endl;
		cout<<"3.作者  4.出版社"<<endl;
		cout<<"5.退出"<<endl;
		cout<<"--------------"<<endl;
		cout<<"请用户选择："<<endl;
		cin>>choose;
		switch(choose)
		{
		case 1:
			cout<<"输入书号：";
			cin>>sh;
			k=BinSearch(bif,sh);
			if(k==0)
			{
				cout<<"没有找到要查的书，请检查是否输入有错？"<<endl;
				break;
			}
			ShowRec(df,k);
			break;
		case 2:
			cout<<"输入书名：";
			cin>>sm;
			k=BnameFind(f1,sm);
			if(k==0)
			{
				cout<<"没有要查找的图书，请检查是否输入有错？"<<endl;
				break;
			}
			for(i=k;i;i=df.BookDbase[i].namenext)
				ShowRec(df,i);
			break;
		case 3:
			cout<<"输入作者名：";
			cin>>zz;
			k=BauthFind(f2,zz);
			if(k==0)
			{
				cout<<"没有要查找的图书，请检查是否输入有错？"<<endl;
				break;
			}
			for(i=k;i;i=df.BookDbase[i].authnext)
				ShowRec(df,i);
			break;
		case 4:
			cout<<"输入出版社：";
			cin>>cbs;
			k=BpressFind(f3,cbs);
			if(k==0)
			{
				cout<<"没有要查找的图书，请检查是否输入有错？"<<endl;
				break;
			}
			for(i=k;i;i=df.BookDbase[i].prenext)
				ShowRec(df,i);
			break;
		case 5:
			return;
		}
	}
}