图书管理系统

精精 · 发表于 2016-1-18 17:51:28

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct
{
char book_id[20]; //书号、
char book_name[40]; //书名、
char publish_date[20]; // 出版日期、
char press[40]; //出版社
char author[40]; // 作者
}Information;
Information *book = NULL;
int current = 0;
int total = 0;
int main()
{
char choice;
//显示程序基本信息
printf(" 图书信息管理系统\n");
while(1)
{
printf("\n");
printf(" 程序功能\n");
printf(" 1:录入图书信息\n");
printf(" 2:保存图书信息\n");
printf(" 3:查询图书信息\n");
printf(" 4:删除图书信息\n");
printf("\n");
printf(" 请选择：");
choice = getch();
printf("\n\n");
switch(choice)
{
case '1':
insert();
break;
case '2':
save();
break;
case '3':
query();
break;
case '4':
delete();
break;
case '0':
if (book != NULL)
{
free(book);
}
return 0;
default:
printf("非法选择，请重新选择\n");
}
}
return 0; //程序返回
}
int insert()
{
while(total <= 0)
{
printf("请输入要图书的学生总数：");
scanf("%d", &total);
}
if (book == NULL)
book = (Information *)malloc(total*sizeof(Information));
if (book == NULL)
{
printf("分配失败\n");
return 1;
}
if (current >= total)
{
Information *tmp = (Information *)malloc(current*sizeof(Information));
memmove(tmp,book,current*sizeof(Information));
total += 10;
realloc(book,total*sizeof(Information));
memmove(book,tmp,current*sizeof(Information));
free(tmp);
}
printf("请输入书号：");
scanf("%s", book[current].book_id);
printf("请输入书名：");
scanf("%s", book[current].book_name);
printf("请输入出版日期：");
scanf("%s", book[current].publish_date);
printf("请输入出版社：");
scanf("%s", book[current].press);
printf("请输入作者：");
scanf("%s", book[current].author);
current++;
return 0;
}
int save()
{
int count;
FILE *fs;
fs = fopen("BookData.dat", "wb");
if (fs == NULL)
{
printf("不能打开文件\n");
return 1;
}
count = fwrite(book, sizeof(Information), current, fs);
fclose(fs);
if (count != current)
{
printf("保存失败\n");
return 1;
}
printf("保存成功\n");
return 0;
}
int query()
{
char query_choice;
printf("\n");
printf(" 选择查询关键字（模糊）查询\n");
printf(" 1:书号\n");
printf(" 2:书名\n");
printf(" 3:出版社\n");
printf("\n");
printf(" 请选择：");
query_choice = getch();
printf("\n\n");
switch(query_choice)
{
case '1':
query_id();
break;
case '2':
query_bookname();
break;
case '3':
query_publish();
break;
default:
printf("非法选择，请重新选择\n");
}
}
int query_id()
{
char id[40];
int i;
printf("请输入要查询的书号：");
scanf("%s", id);
for (i=0; i<current; i++)
{
if (strcmp( book[i].book_id, id ) == 0)
{
printf("该图书信息如下\n");
printf("书号：%s\n", book[i].book_id);
printf("书名：%s\n", book[i].book_name);
printf("出版日期：%s\n", book[i].publish_date);
printf("出版社：%s\n", book[i].press);
printf("作者：%s\n", book[i].author);
return 0;
}
}
printf("该图书不存在！\n\n");
return 1;
}
int query_bookname()
{
char name[40];
int i;
printf("请输入要查询的书名：");
scanf("%s", name);
for (i=0; i<current; i++)
{
if (strcmp(book[i].book_name, name) == 0)
{
printf("该图书信息如下\n");
printf("书号：%s\n", book[i].book_id);
printf("书名：%s\n", book[i].book_name);
printf("出版日期：%s\n", book[i].publish_date);
printf("出版社：%s\n", book[i].press);
printf("作者：%s\n", book[i].author);
return 0;
}
}
printf("该图书不存在！\n\n");
return 1;
}
int query_publish()
{
char press1[40];
int i;
printf("请输入要查询的出版社：");
scanf("%s", press1);
for (i=0; i<current; i++)
{
if (strcmp(book[i].press, press1) == 0)
{
printf("该图书信息如下\n");
printf("书号：%s\n", book[i].book_id);
printf("书名：%s\n", book[i].book_name);
printf("出版日期：%s\n", book[i].publish_date);
printf("出版社：%s\n", book[i].press);
printf("作者：%s\n", book[i].author);
return 0;
}
}
printf("该图书不存在！\n\n");
return 1;
}
int delete()
{
char delete_id[40];
int i;
printf("请输入要删除的图书的书号：");
scanf("%s", delete_id);
for (i=0; i<current; i++)
{
if (strcmp(book[i].book_id, delete_id) == 0)
{
if (i<(current-1))
memmove(&book, &book[i+1], (current-1-i)*sizeof(Information));
current--;
printf("删除成功\n");
return 0;
}
}
printf("该书不存在\n");
return 1;
}

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