C语言课程设计图书馆管理系统

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<ctype.h>
//#include "information.h"

#define MAXNUM 1000

//图书数据类型 
typedef struct book
 {  char isbn[25];       /*书号*/
    char bkname[30];    /*书名*/
	char author[25];   /*作者*/
	float price;       /*单价*/
	char press[28];    /*出版社*/
	int num;          /*库存册数*/      
 }BOOK;       
      
//int TotalBook;
//用线性表保存图书信息 
typedef struct{
	BOOK bk[MAXNUM];
	int TotalBook;
}BookList;

BookList booklist;
void note(){
/*注释：
	作者：lilililimu  
	数据：bookdata.txt
	书号格式：XXX-XXX-XXX-XXX-XXX
		例：978-7-5063-6543-7 
*/
}

main()
{
	//函数原型
	void ReadData();//读取文件  
	void WriteData();//写入文件	
	void showbooklist();//图书列表 
	int showsel();//菜单界面 	
 	int bookquery_scanf_float(char s[]);//小数录入
	int bookbubblesort_showsel();//图书排序菜单 
	void bookbubblesort();//图书排序
	int bookin_verification_isbn(char s[]);//书号格式验证 
	int bookin_exist(char key[]);//根据书号验证图书是否已存在于书库
	int bookquery_scanf(char s[]);	//整数录入  
	int bookin();//图书入库
	int bookdelete_showsel();//删除图书显示 
	int bookdelete_delete(int location)	;//删除图书删除 
	int bookdelete();//删除图书
	void bookquery_key(char s[],char key[]);//获得查询的key值
	int bookquery_showsel(); //图书查询显示函数 
	void bookquery_location_show(int i,int flag);//通过查询到的位置显示图书信息 
	int bookquery_string(char key[],int sel,int location); //通过key查询图书 
	void bookquery();//图书查询
	int booksale();//图书销售  
	int bookscreening_showsel();//图书筛选菜单
	void bookscreening();//图书筛选 
	void salesranking();//销量排行榜 
	void modifytheprice();//修改价格 
	//主程序 
 	ReadData();
 	int sel; 
	//Initial(&booklist);//信息初始化 
 	/*test===============================================================================
 
 
	/* test================================================================================*/ 
 	do{system("cls");sel=showsel();
 		switch(sel)
 		{case 0:break;
 		 case 1: system("cls");showbooklist();getch();break;//已完成 
	 	 case 2: system("cls");bookin();getch();break;
 		 case 3: system("cls");booksale();getch();break;
	 	 case 4: system("cls");bookdelete();getch();break;
 		 case 5: system("cls");bookquery();getch();break;
 		 case 6:system("cls");bookbubblesort();getch();break;
 		 case 7: system("cls");bookscreening();getch();break;
 		 case 8:system("cls");modifytheprice();getch();break;
 		 default:printf("\t\t\t指令不正确!");getch();fflush(stdin);system("cls");break;
	 	}
	 }while(sel);
	 WriteData();
}

//读取文件 
void ReadData(){
FILE *fp;
if ((fp=fopen(".\\bookdata.txt","rb"))==NULL)
    {printf("Can not open the file!\n");return;}
fread(&booklist.TotalBook,sizeof(int),1,fp);
fread(booklist.bk,sizeof(BOOK),booklist.TotalBook,fp);
fclose(fp);
}
//写入文件
void WriteData(){
	FILE *fp;
	if ( (fp=fopen("bookdata.txt","wb"))==NULL)
		{printf("Can not open the file!\n");return;}
	fwrite(&booklist.TotalBook, sizeof(int) ,1 ,fp);
	fwrite(booklist.bk,sizeof(BOOK),booklist.TotalBook,fp);
	fclose(fp);
}
//图书列表 
void showbooklist(){
int i;
 printf("\t\t%-5s%-20s%-29s%-20s%-8s%-8s%-20s%\n",
        "序号","书号","书名","作者","价格","数量","出版社");
 printf("\t\t----------------------------------------------------------------------------------------------------\n");        
 for (i=0;i<booklist.TotalBook;i++)
 	printf("\t\t%-5d%-20s%-29s%-20s%-8.2f%-8d%-20s%\n\n",i+1,booklist.bk[i].isbn,booklist.bk[i].bkname,
	    booklist.bk[i].author,booklist.bk[i].price,booklist.bk[i].num,booklist.bk[i].press);
	printf("\n\t\t按任意键退出!");
}
//菜单界面 
int showsel(){
int sel;
 printf("\t\t简易书店管理系统\n");
 printf("\t\t设计者：184 李俊豪\n");
 printf("\t\t2020/6/9 周三\n"); 
 printf("\t---------------------------------\n");
 printf("\t\t0. 退出程序\n");
 printf("\t\t1. 图书列表\n");
 printf("\t\t2. 图书入库\n");
 printf("\t\t3. 图书销售\n");
 printf("\t\t4. 删除图书\n");
 printf("\t\t5. 图书查询\n");
 printf("\t\t6. 图书排序\n");
 printf("\t\t7. 图书筛选\n");
 printf("\t\t8. 价格修改\n");
 printf("\t----------------------------------\n");
 printf("\t\t请输入要选择的功能编号：");
 int ret=scanf("%d",&sel); 
 if(ret) return sel;
 else{
 	return 15;
 } 
}
//通过查询到的位置显示图书信息 
void bookquery_location_show(int i,int flag){
	if(flag==0){
		printf("\t\t%-5s%-20s%-29s%-20s%-8s%-8s%-20s\n",
       "序号","书号","书名","作者","价格","数量","出版社");}
     	printf("\t\t%-5d%-20s%-29s%-20s%-8.2f%-8d%-20s\n",flag+1,booklist.bk[i].isbn,booklist.bk[i].bkname,
		booklist.bk[i].author,booklist.bk[i].price,booklist.bk[i].num,booklist.bk[i].press);   
}
//根据书号验证图书是否已存在于书库
int bookin_exist(char key[]) {
	int i;
	for(i=0;i<booklist.TotalBook;i++){
		if(strcmp(key,booklist.bk[i].isbn)==0){
			return i;
		}
	}		
	return -1;
}
//小数录入
 int bookquery_scanf_float(char s[]){
		float digital;
		int ret=0;
		int record=0;
		do{		
			digital=-3;
			if(record==0){
				printf("\t\t请输入%s价格：(或者输入'-1'放弃录入！)\n\t\t",s);
			}else{
				printf("\t\t价格格式有误！请重新输入价格：(或者输入'-1'放弃录入！)\n\t\t");
			}
			record++;
			ret=scanf("%f",&digital);
			fflush(stdin);
		}while((!ret||digital<0)&&digital!=-1);
		if(digital==-1){
			//printf("\t\t图书入库失败！");
			return -1;
		}else{
			return digital;
		}
}
//整数录入 
int bookquery_scanf(char s[]){
		int ret=0;
		int record=0;
		float digital=-1;
		do{	
			if(record==0){
				printf("\t\t请输入书本的%s：(或者输入'-1'放弃！)\n\t\t",s);
			}else{
				printf("\t\t%s输入有误！请重新输入:(或者输入'-1'放弃！)\n\t\t",s);
			}
			record++;
			ret=scanf("%f",&digital);
			if(ret==0){
				digital=-5;
			}
			if((int)digital==digital&&ret&&digital>0){
				ret=1;
			}else if(digital==-1){
				ret=1;
			}else{
				ret=0;
			}
			fflush(stdin);
		}while(!ret);
		if(digital==-1){
			//printf("放弃出售！");
			return -1;
		}else{
			return digital;
		}
}
//图书入库 
int bookin(){
	printf("\t\tBook In...\n");
	int record;
	char flag='y';
	while(flag=='y'){
		char key[25]="";
		int exist=-1;
		record=0;
		do{	
			printf("*********************************************************\n");
			if(record==0){
				printf("\t\t请输入书号：(或者输入'n'放弃录入！)\n\t\t");
			}else{
				printf("\t\t书号格式不正确！请重新输入书号：(或者输入'n'放弃录入！)\n\t\t");
			}
			record++;
			scanf("%s",&key);
			if(key[0]=='n'){
				flag='n';
			}
		}while(!bookin_verification_isbn(key)&&flag=='y');			
		if(flag!='y'){
			printf("\t\t图书入库失败！");
			return 0;
		}else{
			exist=bookin_exist(key);
			if(exist!=-1){
				//printf("图书已存在，请输入需要增加的数量:\n");
				bookquery_location_show(exist,0);
				float digital=-1;
				digital=bookquery_scanf("数量");
				if(digital==-1){
					printf("\t\t图书入库失败！");
					return 0;
				}else{
					booklist.bk[exist].num+=digital;
					printf("\t\t图书录入成功！\n");
					bookquery_location_show(exist,0);
					printf("\t\t是否继续录入?输入y/n.\n\t\t");
					scanf("%c",&flag);
					if(flag=='y'){
						continue;
					}else{
						printf("\t\t请按任意键返回主界面！");
						return 0;
					}	
				}
			}else{
				strcpy(booklist.bk[booklist.TotalBook].isbn,key);
			}	
		}
		printf("\t\t新书录入！\n\t\t请输入作者：或者输入'@'放弃录入！\n\t\t");
		scanf("%s",&booklist.bk[booklist.TotalBook].author);
		if(booklist.bk[booklist.TotalBook].author[0]=='@'){
			printf("\t\t图书入库失败！");
			return 0;
		}
		printf("\t\t请输入书名：或者输入'@'放弃录入！\n\t\t");
		scanf("%s",&booklist.bk[booklist.TotalBook].bkname);
		if(booklist.bk[booklist.TotalBook].bkname[0]=='@'){
			printf("\t\t图书入库失败！");
			return 0;
		}
		printf("\t\t请输入出版社：或者输入'@'放弃录入！\n\t\t");
		scanf("%s",&booklist.bk[booklist.TotalBook].press);
		if(booklist.bk[booklist.TotalBook].press[0]=='@'){
			printf("\t\t图书入库失败！");
			return 0;
		}
		float digital;
		int ret=0;
		record=0;
		digital=bookquery_scanf_float("");
		if(digital==-1){
			printf("\t\t图书入库失败！");
			return 0;
		}else{
			booklist.bk[booklist.TotalBook].price=digital;
		}
		digital=-1;
		ret=0;
		record=0;
		digital=bookquery_scanf("数量");
		if(digital==-1){
			printf("\t\t图书入库失败！");
			return 0;
		}else{
			booklist.bk[booklist.TotalBook].num=digital;
		}
		booklist.TotalBook+=1;
		printf("\t\t图书录入成功！\n");
		bookquery_location_show(booklist.TotalBook-1,0);
		printf("\t\t是否继续录入?输入y/n.\n\t\t");
		scanf("%c",&flag);
		fflush(stdin);
	}
	printf("\t\t按任意键返回主界面！");
	return 0;
}


//获得查询的key值
void bookquery_key(char s[],char key[]){
	printf("\t\t请输入需要查询的%s:",s);
	scanf("%s",key);
}
//删除图书显示 
int bookdelete_showsel(){
	int sel;
 printf("\t\t删除系统\n");
 printf("\t---------------------------------\n");
 printf("\t\t0. 退出程序\n");
 printf("\t\t1. 删除指定书籍\n");
 printf("\t\t2. 删除全部数量为零的书籍\n");
 printf("\t----------------------------------\n");
 printf("\t\t请输入要选择的功能编号：");
 int ret=scanf("%d",&sel); 
 if(ret) return sel;
 else{
 	return 15;
 } 
}
//删除图书删除 
int bookdelete_delete(int location){ 
	int i;
	if(location<0||location>booklist.TotalBook) return -1;
	for(i=location;i<booklist.TotalBook;i++){
		booklist.bk[i]=booklist.bk[i+1];
	}
	booklist.TotalBook--;
	return 1;
}
//删除图书
int bookdelete(){
	printf("\t\tBook Delete...\n");
	int sel;
	int location=-1;
	int resault[5];
	int flag=0;
	char choose;
	int i;
	char key[25];
	do{
		system("cls");sel=bookdelete_showsel();
 		switch(sel)
 			{case 0:printf("\t\t按任意键退出！");break;
 			 case 1:
 			 	bookquery_key("书号",key);
 			 	flag=0;
 			 	do{
					location=bookquery_string(key,3,location);
					if(location!=-1){
						bookquery_location_show(location,flag);
						location+=1;
						resault[flag]=location;
						flag++;
					}
				}while(location!=-1); 
					if(flag==0){
						printf("\t\t未查到所需信息！");
					}
					if(flag>0){
						do{
							location=bookquery_scanf("序号");
							}while(location>flag&&location!=-1);
							if(location==-1) {
								printf("放弃删除！");
								return 0;
					}else{
							if(booklist.bk[resault[location-1]-1].num==0){
								flag=bookdelete_delete(resault[location-1]-1);
								if(flag==1){
									printf("\t\t删除成功！");
								}
							}else{
								printf("\t\t图书未售空，无法从书库中移除！");
							}
					}
				}
				getch();
				break;
	 	 	case 2:
	 	 		flag=0;
	 	 		for(i=0;i<booklist.TotalBook;i++)
 			 		if(booklist.bk[i].num==0){
 			 			bookquery_location_show(flag,i);
 			 			flag++;
					  }
 			 		
 			 	printf("\t\t是否全部删除？输入y/n:");
 			 	fflush(stdin);
 				choose=getchar();
 				if(choose=='y'){
				 	for(flag=0;flag<booklist.TotalBook;flag++){
			  			if(booklist.bk[flag].num==0){
			  				bookdelete_delete(flag);
				 		 }
			 		 } 
			  		printf("\t\t删除成功！");
				 }else{
				 	printf("\t\t放弃删除！");
				 }
			  
			  getch();
			  break;
 			 default:printf("\t\t\t指令不正确!");getch();fflush(stdin);system("cls");break;
	 	}
	 }while(sel);
} 

//图书查询
void bookquery(){
	printf("/t/t/tBook query...");
	int sel;
	do{
		system("cls");sel=bookquery_showsel();
		char key[30]="";
		int location=-1;
		int flag=0;
		switch(sel){
			case 0:printf("\t\t按任意键退出！");break;
			case 1:
				bookquery_key("书名",key);
				do{
					location=bookquery_string(key,1,location);
					if(location!=-1){
						bookquery_location_show(location,flag);
						location+=1;
						flag++;
					}
				}while(location!=-1); 
				if(flag==0){
					printf("\t\t未查到所需信息！");
				}
				getch();
				break;
			case 2:
				flag=0;
				location=-1;
				bookquery_key("作者",key);
				do{
					location=bookquery_string(key,2,location);
					if(location!=-1){
						bookquery_location_show(location,flag);
						location+=1;
						flag++;
					}
				}while(location!=-1); 
				if(flag==0){
					printf("\t\t未查到所需信息！");
				}
				getch();
				break;
			case 3:
				flag=0;
				location=-1;
				bookquery_key("书号",key);
				do{
					location=bookquery_string(key,3,location);
					if(location!=-1){
						bookquery_location_show(location,flag);
						location+=1;
						flag++;
					}
				}while(location!=-1); 
				if(flag==0){
					printf("\t\t未查到所需信息！");
				}
				getch();
				break;
			case 4:
				flag=0;
				location=-1;
				bookquery_key("出版社",key);
				do{
					location=bookquery_string(key,4,location);
					if(location!=-1){
						bookquery_location_show(location,flag);
						location+=1;
						flag++;
					}
				}while(location!=-1); 
				if(flag==0){
					printf("\t\t未查到所需信息！");
				}
				getch();
				break; 
			default:printf("\t\t\t指令不正确!");getch();fflush(stdin);system("cls");break;
		}
	}while(sel);
}

//图书销售 
int booksale(){
	printf("\t\tBook Sale...\n");
	char key[30];
	int resault[5];
	int location=-1;
	int flag=0;
	printf("\t\t请输入你要出售的书名：或者输入'@'放弃录入！\n\t\t");
	scanf("%s",key);
	if(key[0]=='@'){
		printf("\t\t放弃出售！");
		return 0;
	}
	do{
		location=bookquery_string(key,1,location);
		if(location!=-1){
			bookquery_location_show(location,flag);
			location+=1;
			resault[flag]=location;
			flag++;
		}
	}while(location!=-1); 
		if(flag==0){
		printf("\t\t未查到所需信息！");
	}
	if(flag>0){
		do{
			location=bookquery_scanf("序号");
		}while(location>flag&&location!=-1);
		if(location==-1) {
			printf("\t\t放弃出售！");
			return 0;
		
		}else{
			do{
				flag=bookquery_scanf("数量"); 
				if(flag>booklist.bk[resault[location-1]-1].num){
				printf("\t\t需要出售数量大于书库中书本数量，请重新输入！\n");
				}
			}while(flag!=-1&&flag>booklist.bk[resault[location-1]-1].num);
			if(flag==-1) {
				printf("\t\t放弃出售！");
				return 0;
			}
		}
	} 
	if(flag>0&&booklist.bk[resault[location-1]-1].num!=0){
		booklist.bk[resault[location-1]-1].num-=flag;
		bookquery_location_show(resault[location-1]-1,0);
		printf("\t\t出售成功！");
		if(booklist.bk[resault[location-1]-1].num==0){
			printf("\n\t\t书本已售空，是否从书库移除?y/n:");
			scanf("%s",key);
			if(key[0]=='y'){
				bookdelete_delete(resault[location-1]-1);
				printf("\t\t移除成功！按任意键退出！");
			}else printf("\t\t请按任意键退出！");
		}
	}	
	return 0;				
}
//图书排序菜单
int bookbubblesort_showsel(){
		int sel;
	 printf("\t\t排序系统\n");
	 printf("\t---------------------------------\n");
	 printf("\t\t0. 退出程序\n");
	 printf("\t\t1. 根据数量由大到小排序\n");
	 printf("\t\t2. 根据数量由小到大排序\n");
	 printf("\t\t3. 根据价格由大到小排序\n");
	 printf("\t\t4. 根据价格由小到大排序\n");
	 printf("\t\t5. 根据作者姓名排序\n");
   	printf("\t----------------------------------\n");
 	printf("\t\t请输入要选择的功能编号：");
 	int ret=scanf("%d",&sel); 
	 if(ret) return sel;
 	else{
 		return 15;
 	} 
} 
//图书排序 
void bookbubblesort()
{
	int i;
	int j;
	int sel;
    BOOK  temp;
	do{
		system("cls");sel=bookbubblesort_showsel();
 		switch(sel)
 			{case 0:printf("\t\t按任意键退出！");break;
 			 case 1: 
				if (booklist.TotalBook == 0)
				{
					printf("\t\t书库为空！");
					return;
				}
				for (i = 0; i < booklist.TotalBook-1;i++)
					for (j = 0; j < booklist.TotalBook-1;j++)
						if (booklist.bk[j].num<booklist.bk[j+1].num)
						{
							{
								temp = booklist.bk[j];
								booklist.bk[j]= booklist.bk[j+1];
								booklist.bk[j+1] = temp;
							}
						}
			printf("\t\t排序完成！");
			getch();
			break;
	 	 	case 2:
			 if (booklist.TotalBook == 0)
				{
					printf("\t\t书库为空！");
					return;
				}
				for (i = 0; i < booklist.TotalBook-1;i++)
					for (j = 0; j < booklist.TotalBook-1;j++)
						if (booklist.bk[j].num>booklist.bk[j+1].num)
						{
							{
								temp = booklist.bk[j];
								booklist.bk[j]= booklist.bk[j+1];
								booklist.bk[j+1] = temp;
							}
						}
			printf("\t\t排序完成！");
			getch();
			break;
			case 3:
			  if (booklist.TotalBook == 0)
				{
					printf("\t\t书库为空！");
					return;
				}
				for (i = 0; i < booklist.TotalBook-1;i++)
					for (j = 0; j < booklist.TotalBook-1;j++)
						if (booklist.bk[j].price<booklist.bk[j+1].price)
						{
							{
								temp = booklist.bk[j];
								booklist.bk[j]= booklist.bk[j+1];
								booklist.bk[j+1] = temp;
							}
						}
			printf("\t\t排序完成！");
			getch();
			break;
			case 4:
			  if (booklist.TotalBook == 0)
				{
					printf("\t\t书库为空！");
					return;
				}
				for (i = 0; i < booklist.TotalBook-1;i++)
					for (j = 0; j < booklist.TotalBook-1;j++)
						if (booklist.bk[j].price>booklist.bk[j+1].price)
						{
							{
								temp = booklist.bk[j];
								booklist.bk[j]= booklist.bk[j+1];
								booklist.bk[j+1] = temp;
							}
						}
				printf("\t\t排序完成！");
				getch();
				break;
			case 5:
				if (booklist.TotalBook == 0)
				{
					printf("\t\t书库为空！");
					return;
				}
				for (i = 0; i < booklist.TotalBook-1;i++)
					for (j = 0; j < booklist.TotalBook-1;j++)
						if (strcmp(booklist.bk[j].author,booklist.bk[j+1].author)>0)
						{
							{
								temp = booklist.bk[j];
								booklist.bk[j]= booklist.bk[j+1];
								booklist.bk[j+1] = temp;
							}
						}
			printf("\t\t排序完成！");
			getch();
			break;
 			 default:printf("\t\t\t指令不正确!");getch();fflush(stdin);system("cls");break;
	 	}
	 }while(sel);
	
    
} 
//图书筛选菜单 
int bookscreening_showsel(){
	int sel;
	 printf("\t\t筛选系统\n");
	 printf("\t---------------------------------\n");
	 printf("\t\t0. 退出程序\n");
	 printf("\t\t1. 根据价格区间筛选\n");
	 printf("\t\t2. 根据数量区间筛选\n");
	 printf("\t----------------------------------\n");
	 printf("\t\t请输入要选择的功能编号：");
	 int ret=scanf("%d",&sel); 
	 if(ret) return sel;
	 else{
	 	return 15;
	 } 
}
//图书筛选 
void bookscreening(){
	/*根据价格区间，同一作者，同一出版商筛选图书，方便顾客购买，功能可依赖于图书查询*/
	printf("\t\tBook screening...");
	int sel;
	do{
		float max=-1;
		float min=-1;
		int i;
		int flag=0;
		system("cls");sel=bookscreening_showsel();
 		switch(sel)
 			{case 0:printf("\t\t按任意键退出！");break;
 			 case 1:
				max=bookquery_scanf_float("最大"); 
				if(max!=-1){
					min=bookquery_scanf_float("最小"); 
				}
				if(max>min&&max!=-1&&min!=-1){
					for(i=0;i<booklist.TotalBook;i++){
						if(booklist.bk[i].price<=max&&booklist.bk[i].price>=min){
							bookquery_location_show(i,flag);
							flag++;
						}	
					}
				}
				if(flag==0){
			  		printf("\t\t没有符合条件的数据！按任意键退出！\n");
			    }
				getch();
				break;
	 	 	case 2:
				max=bookquery_scanf("最大数量"); 
				if(max!=-1){
					min=bookquery_scanf("最小数量"); 
				}
				if(max>min){
					for(i=0;i<booklist.TotalBook;i++){
						if(booklist.bk[i].num<=max&&booklist.bk[i].num>=min){
							bookquery_location_show(i,flag);
							flag++;
						}	
					}
				}
			  if(flag==0){
			  	printf("\t\t没有符合条件的数据！按任意键退出！\n");
			  }
			  getch();
			  break;
 			 default:printf("\t\t\t指令不正确!");getch();fflush(stdin);system("cls");break;
	 	}
	 }while(sel);
}
//图书销量排行榜 
void salesranking(){
	printf("salesranking...");
}
//书号格式验证 
int bookin_verification_isbn(char s[]){
	int flag=1;
	int i;
	int num=0;
	char s1[13];//数字书号 
	if(strlen(s)!=17){//位数验证 
		flag*=0;
	}
	for(i=0;i<17;i++){
		if(isdigit(s[i])){
			num++;
		} 
	}
	if(num!=13){
		flag*=0;
	}
	char s2=s[0];
	if(isdigit(s2)==0){
		flag*=0;
	}
	s2=s[16];
	if(isdigit(s2)==0){
		flag*=0;
	}
	return flag;
}
// 图书查询显示函数 
int bookquery_showsel(){
	int sel;
 	printf("\t\t图书查询系统\n");
 	printf("\t---------------------------------\n");
 	printf("\t\t0. 退出系统\n");
	printf("\t\t1. 以书名查询\n");
 	printf("\t\t2. 以作者查询\n");
 	printf("\t\t3. 以书号查询\n");
 	printf("\t\t4. 以出版社查询\n");
 	printf("\t----------------------------------\n");
 	printf("\t\t请输入要选择的功能编号：");
 	int ret=scanf("%d",&sel); 
 	if(ret) return sel;
	else{
 		return 15;
 	} 
}
//通过key查询图书 
int bookquery_string(char key[],int sel,int location){
	switch(sel){
		case 1:
			for(location;location<booklist.TotalBook;location++){
				if(strcmp(key,booklist.bk[location].bkname)==0){
					return location;
				}
			}break;
		case 2:
			for(location;location<booklist.TotalBook;location++){
				if(strcmp(key,booklist.bk[location].author)==0){
					return location;
				}
			}break;
			case 3:
				for(location;location<booklist.TotalBook;location++){
				if(strcmp(key,booklist.bk[location].isbn)==0){
					return location;
				}
			}break;
			case 4:
				for(location;location<booklist.TotalBook;location++){
				if(strcmp(key,booklist.bk[location].press)==0){
					return location;
				}
			}break;
	}
	return -1;
} 
//修改价格 
void modifytheprice(){
	char key[25];
	float digital;
	int flag=0;
	int resault[5];
	int location=-1;
	bookquery_key("书号",key);
	do{
		location=bookquery_string(key,3,location);
		if(location!=-1){
			bookquery_location_show(location,flag);
			location+=1;
			resault[flag]=location;
			flag++;
		}
	}while(location!=-1); 
	if(flag==0){
		printf("\t\t未查到所需信息！");
	}
	if(flag>0){
		do{
			location=bookquery_scanf("序号");
		}while(location>flag&&location!=-1);
		if(location==-1) {
			printf("\t\t放弃修改！");
			getch();
			return ;
		}else{
			digital=bookquery_scanf_float("");
			if(digital!=-1){
				booklist.bk[resault[location-1]-1].price=digital;
				bookquery_location_show(resault[location-1]-1,1);
				printf("\t\t修改成功！");
			}
		
		}
	}
	return;
 }