#include"stdio.h"
#include"stdlib.h"
#include"string.h"
#include"conio.h"
#define Pquantity 3
#define MAX 1000
#define N 5
int k=0;
/*结构体类型*/
typedef struct
{ int num;/*编号*/
char name[20];/*书名*/
char author[20];/*作者*/
char press[20];/*出版社*/
float price;/*价格*/
int quantity;/*数量*/
}STUDENTS;
int read_file(STUDENTS book[])
{ FILE *fp;
int i=0;
if((fp=fopen("book.txt","rt"))==NULL)
{printf("\n\n—————库存文件不存在！请创建");
return 0;
}
while(feof(fp)!=1)
{
fread(&book[i],sizeof(STUDENTS),1,fp);
if(book[i].num==0)
break;
else
i++;
}
fclose(fp);
return i;
}
void save_file(STUDENTS book[],int sum)
{FILE*fp;
int i;
if((fp=fopen("book.txt","wb"))==NULL)
{printf("写文件错误\n");
return;
}
for(i=0;i<sum;i++)
if(fwrite(&book[i],sizeof(STUDENTS),1,fp)!=1)
printf("写文件错误\n");
fclose(fp);
}
/*创建图书信息*/
int input(STUDENTS book[])
{ int i,x;
for(i=0;i<1000;i++)
{
system("cls");
printf("\n\n 录入图书信息 (最多%d本)\n",MAX);
printf(" ----------------------------\n");
printf("\n 第%d本图书",k+1);
printf("\n 请输入图书的编号:");
scanf("%d",&book[k].num);
getchar();
printf("\n 请输入图书的书名:");
scanf("%s",book[k].name);
getchar();
printf("\n 请输入图书的作者:");
scanf("%s",book[k].author);
getchar();
printf("\n 请输入图书的出版社:");
scanf("%s",book[k].press);
getchar();
printf("\n 请输入图书的价格:");
scanf("%f",&book[k++].price);
getchar();
printf("\n 请输入图书的数量:");
scanf("%d",&book[i].quantity);
getchar();
printf("\n 请按1键返回菜单或按0键继续创建");
scanf("%d",&x);
if(x)
break;
}
return k;
}
/*删除图书信息*/
void deletel(STUDENTS book[])
{ system("cls");
char Bookname2[20];
int i,j;
printf("请输入图书书名：");
scanf("%s",Bookname2);
printf("\n");
for(i=0;i<k;i++)
if(strcmp(book[i].name,Bookname2)==0)
for(j=0;j<20;j++)
book[i].name[j]=book[i+1].name[j];
k--;
printf("借阅成功\n");
printf("按任意键加回车返回主菜单!");
scanf("%d",&i);
getchar();
}
/*打印图书信息*/
void output(STUDENTS book[])
{ system("cls");
int i;
for(i=0;i<k;i++)
printf("编号：%d,书名：%s,作者：%s,出版社：%s,价格: %.2f,数量：%d\n",book[i].num,book[i].name,
book[i].author,book[i].press,book[i].price,book[i].quantity);
printf("按任意键加回车返回主菜单!");
scanf("%d",&i);
getchar();
}
/*查询图书信息*/
void inquire(STUDENTS book[])
{ int i;
char name[20];
system("cls");
printf(" \n\n请输入您要查找的图书的书名：");
scanf("%s",&name);
for(i=0;i<k;i++)
if(strcmp(name,book[i].name)==0)
printf("\n\n\n编号：%d,书名：%s,作者：%s,出版社：%s,价格: %.2f,数量：%d\n",book[i].num,book[i].name,
book[i].author,book[i].press,book[i].price,book[i].quantity);
printf("按任意键加回车返回主菜单!");
scanf("%d",&i);
getchar();
}
/*修改图书信息*/
void change(STUDENTS book[])
{ int num,i,choice;
system("cls");
printf("\n\n\n 请输入您要修改的图书的编号");
scanf("%d",&num);
for(i=0;i<k;i++)
{ if(num==book[i].num)
printf("\n编号：%d,书名：%s,作者：%s,出版社：%s,价格: %.2f,数量：%d\n",book[i].num,book[i].name,
book[i].author,book[i].press,book[i].price,book[i].quantity);
printf("\n\n\n ********请输入您想要修改的数据********\n\n");
printf(" 1. 编号\n\n");
printf(" 2. 书名\n\n");
printf(" 3. 作者\n\n");
printf(" 4. 出版社\n\n");
printf(" 5. 价格\n\n");
printf(" 6. 数量\n\n");
printf(" 请选择（1-6）:");
scanf("%d",&choice);
switch(choice)
{case 1:{
printf("\n 请输入你改的新编号");
scanf("%d",&book[i].num);
break;
}
case 2:{
printf("\n 请输入你改的新书名");
scanf("%s",book[i].name);
break;
}
case 3:{
printf("\n 请输入你改的新作者");
scanf("%s",book[i].author);
break;
}
case 4:{
printf("\n 请输入你改的新出版社");
scanf("%s",book[i].press);
break;
}
case 5:{
printf("\n 请输入你改的新价格");
scanf("%f",&book[i].price);
break;
case 6:{
printf("\n 请输入你改的新数量");
scanf("%d",&book[i].quantity);
break;
}
}
}
printf("编号：%d,书名：%s,作者：%s,出版社：%s,价格: %.2f,数量：%d\n",book[i].num,book[i].name,
book[i].author,book[i].press,book[i].price,book[i].quantity);
printf("按任意键加回车返回主菜单!");
scanf("%d",&i);
break;
}
}
/*图书价格信息排名*/
void sort(STUDENTS book[])
{ int i,j,n=1,x;
system("cls");
int t;
for(i=0;i<k-1;i++)
for(j=i+1;j<k;j++)
if(book[i].price<book[j].price)
{ t=book[i].price;
book[i].price=book[j].price;
book[j].price=t;
t=book[i].num;
book[i].num=book[j].num;
book[j].num=t;
}
for(i=0;i<k;i++)
printf("排名 编号 价格\n %d %d %.2f\n",n++,book[i].num,book[i].price);
printf("按任意键加回车返回主菜单!");
scanf("%d",&x);
getchar();
}
void pquantitydis()
{
printf(" \n");
printf(" \n");
printf(" \n");
printf(" 欢迎进入图书信息管理系统 \n");
printf(" \n");
printf(" \n");
printf(" \n");
}
void check()
{
char userName[5];/*用户名*/
char userPWD[5];/*密码*/
int i,sum;
system("color 0B");
for(i = 1; i < 4; i++)
{
/*用户名和密码均为111;*/
printf(" (用户名和密码均为111)\n\n");
printf(" 注：自主创建账号并保存与密码加密还未完善。。。(就是还不太会)\n\n");
printf("\n 请输入您的用户名:");
gets(userName);
printf("\n 请输入您的密码:");
gets(userPWD);
if ((strcmp(userName,"111")==0) && (strcmp(userPWD,"111")==0))/*验证用户名和密码*/
{
printf("\n *用户名和密码正确，显示主菜单*");
return;
}
else
{
if (i < 3)
{
printf("用户名或密码错误，提示用户重新输入");
printf("用户名或密码错误，请重新输入!");
}
else
{
printf("连续3次输错用户名或密码，退出系统。");
printf("您已连续3次将用户名或密码输错，系统将退出!");
exit(1);
}
}
}
}
void menu()
{
STUDENTS book[20];
int choice,k,sum;
sum=read_file(book);
if(sum==0)
{ printf("首先录入基本库存信息！按回车后进入—————\n");
getch();
sum=input(book);
}
do
{ system("cls");
printf("\n\n\n ********图书信息管理系统********\n\n");
printf(" 1. 创建图书信息\n\n");
printf(" 2. 打印图书信息\n\n");
printf(" 3. 查询图书信息\n\n");
printf(" 4. 修改图书信息\n\n");
printf(" 5. 删除图书信息\n\n");
printf(" 6. 图书价格信息排名\n\n");
printf(" 0. 退出系统\n\n");
printf(" 请选择（0-6）:");
scanf("%d",&choice);
switch(choice)
{
case 1: k=input(book); break;/*创建图书信息*/
case 2: output( book) ; break;/*打印图书信息*/
case 3: inquire(book); break;/*查询图书信息*/
case 4: change(book); break;/*修改图书信息*/
case 5: deletel(book); break;/*删除图书信息*/
case 6: sort(book); break;/*图书价格信息排名*/
case 0: break;
}
}while(choice!=0);
save_file(book,sum);
}
int main()
{
int i,sum;
pquantitydis();
check();
menu();
}
