自己写的C语言图书管理系统程序综合使用了数组，指针，结构体的知识 -

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
系统名称：图书管理系统
系统功能：增加图书删除图书查找图书查看图书借书还书个人借书情况等
作者：陈银虎
完成时间：2019年11月19日
*/
struct Book
{
char name[32]; //书名
int count; //本数
int flag; //是否可借 1表示可借
};
typedef struct Book book;
struct Student
{
char name[32]; //学生名
int id; //学生学号
char *book[5]; //已经借的书
int count; //借的本数
};
typedef struct Student stu;
book *g_book[1024] = {0}; //图书馆所有书
stu *g_student[1024] = {0}; //图书馆记录的所有借书的学生
int g_BookCount = 0; //图书馆书的本数
int g_StudentCount = 0; //借书的人数
void menu()
{
system("clear");
printf("\t\t-----------------------------------------------\n");
printf("\t\t 1、增加图书 2、删除图书\n");
printf("\t\t 3、查看图书 4、查找图书\n");
printf("\t\t 5、借书 6、还书\n");
printf("\t\t 7、借书情况 8、退出系统\n");
printf("\t\t----------------------------------------------\n");
}
/*
函数描述：图书馆初始化，存放一些图书
函数参数：无
函数返回值：无
*/
void init()
{
int i;
for (i = 0; i < 9; i++)
{
g_book[i] = (book *)malloc(sizeof(book) * 1);
if (NULL == g_book[i])
{
printf("mallco failrue!\n");
}
g_book[i]->flag = 1; //表示可借
g_BookCount++;
}
strcpy(g_book[0]->name, "数学");
strcpy(g_book[1]->name, "英语");
strcpy(g_book[2]->name, "语文");
strcpy(g_book[3]->name, "思想品德");
strcpy(g_book[4]->name, "历史");
strcpy(g_book[5]->name, "马克思主义");
strcpy(g_book[6]->name, "C语言");
strcpy(g_book[7]->name, "单片机");
strcpy(g_book[8]->name, "嵌入式");
g_book[0]->count = 3;
g_book[1]->count = 5;
g_book[2]->count = 1;
g_book[3]->count = 3;
g_book[4]->count = 5;
g_book[5]->count = 10;
g_book[6]->count = 2;
g_book[7]->count = 15;
g_book[8]->count = 7;
}
/*
函数描述：显示图书馆所有书本
函数参数：无
函数返回值：无
*/
void ShowBook()
{ printf("\t\t借阅情况：\n");
printf("\t\t图书馆总藏书数：%d\n",g_BookCount);
printf("\t\t总借阅人数：%d\n",g_StudentCount);
printf("\t\t书本情况：\n");
int i;
for (i = 0; i < g_BookCount; i++)
{
printf("\t\t 书名：%s 本数 %d 是否可借 %s\n", g_book[i]->name, g_book[i]->count,
(g_book[i]->flag == 1) ? "可借" : "不可借");
}
printf("\n");
printf("\t\t具体个人的借阅情况请在返回主菜单后到借阅情况\n");
sleep(4);
}
/*
函数描述: 查询图书馆的所有书本
函数参数：无
函数返回值：无
*/
void SearchBook()
{ char s[32]={0};
printf("\t\t输入你要查询的书名：\n");
scanf("%s",s);
int i=TraverseBook(s);
if (i == -1) //未查询到结果
{
printf("\t\t图书馆内无此书！\n");
return;
}
else
{
if (g_book[i]->flag == 1) //可借
{
printf("\t\t可借，还有%d本。\n",g_book[i]->count);
}
else
{
printf("\t\t此书已被借完！\n"); //不可借
}
}
}
/*
函数描述：根据id查找学生是否存在
函数参数：学号
函数返回值：学生存在返回下标学生不存在返回-1
*/
int TraverseStudent(int id)
{
int i;
for (i = 0; i < g_StudentCount; i++)
{
if (id == g_student[i]->id)
{
// printf("存在！"); //调试用
return i;
}
}
return -1;
}
/*
函数描述：根据书名判断书是否存在
函数参数：书名
函数返回值：存在则返回书本的下标，不存在返回-1
*/
int TraverseBook(char *n)
{
int i;
for (i = 0; i < g_BookCount; i++)
{
if (strcmp(n, g_book[i]->name) == 0)
{
return i;
}
}
return -1;
}
/*
函数描述：增加书籍
函数参数：无
函数返回值：无
*/
void AddBook()
{
printf("\t\t请输入要增加的书籍名称：\n");
char name[32] = {0};
int num;
scanf ("%s",name);
//判断书籍是否已经存在
int result = TraverseBook(name);
if (result != -1)
{
printf("\t\t该书已存在，请输入你要增加的数量：\n");
scanf("%d",&num);
g_book[result]->count +=num;
printf("书籍增加成功,该书现在有%d本\n",g_book[result]->count);
return;
}
//书籍不存在，分配空间
else
{ g_BookCount ++;
g_book[g_BookCount - 1] = (book *)malloc(sizeof(book)*1);
if (NULL == g_book[g_BookCount - 1])
{
printf("malloc failure!\n");
}
g_book[g_BookCount -1]->flag = 1;
}
strcpy(g_book[g_BookCount -1]->name,name);
printf("\t\t请输入要增加的本数：\n");
scanf ("%d",&num);
g_book[g_BookCount - 1]->count = num;
printf("\t\t增加成功，该书现在有%d本\n",num);
return;
}
/*
函数描述：删除输入的书目
函数参数：无
函数返回值：无
*/
void DeleteBook()
{
int i,result=0;
printf("\t\t请输入要删除的书目：\n");
char name[32]={0};
scanf ("%s",name);
result = TraverseBook(name);
if (-1 == result)
{
printf("\t\t书本不存在，删除失败！\n");
return ;
}
else
{
for (i = result;i < g_BookCount;i++)
{
g_book[i] = g_book[i+1];
}
g_BookCount--;
printf("\t\t删除成功！\n");
}
}
/*
函数描述：借书部分
函数参数：无
函数返回值：无
*/
void BorrowBook()
{
int id = 0;
printf("\t\t请输入学号：\n");
scanf("%d", &id);
//遍历g_student数组，判断学生是否借过书
int result = TraverseStudent(id); //判断id是否存在
int sturesult = result;
if (result == -1) //不存在，给新的学生申请内存
{
g_StudentCount ++;
g_student[g_StudentCount - 1] = (stu *)malloc(sizeof(stu) * 1);
if (NULL == g_student[g_StudentCount - 1])
{
printf("malloc fialure!\n");
return;
}
printf("\t\t要借哪本书：\n");
char name[32] = {0};
scanf("%s", name);
//判断书在不在
result = TraverseBook(name);
if (-1 == result) //书本不存在
{
printf("\t\t书本不存在,借书失败\n");
return;
}
else //书本存在
{
if (g_book[result]->flag == 0)
{
printf("\t\t该书已经被借完！\n");
}
else
{
g_book[result]->count--;
if (0 == g_book[result]->count)
{
g_book[result]->flag = 0; //书本不可借
}
g_student[g_StudentCount - 1]->id = id; //记录学生的学号
g_student[g_StudentCount - 1]->book[g_student[g_StudentCount - 1]->count] = (char *)malloc(sizeof(char) * 128);
if (NULL == g_student[g_StudentCount - 1]->book)
{
printf("malloc failure!\n");
return;
}
strcpy(g_student[g_StudentCount - 1]->book[g_student[g_StudentCount - 1]->count], name); //保存书名
g_student[g_StudentCount - 1]->count++; //借书的本数加一
printf("\t\t借书成功\n");
}
}
}
//存在判断借书是否达到上限
else
{
if (g_student[sturesult]->count == 5 )
{
printf("借书已达上限！\n");
return;
}
else
{
printf("\t\t要借哪本书？\n");
char name1[32]={0};
scanf("%s",name1);
//判断书是否存在
int result1 = TraverseBook(name1);
{
if (-1==result1)//书本不存在
{
printf("\t\t书本不存在，借书失败！\n");
return;
}
else
{ if (g_book[result1]->flag == 0 )
{
printf("\t\t该书已经被借完！\n");
}
else
{ //书本存在
g_book[result1]->count--;
if (0 == g_book[result1]->count)
{
g_book[result]->flag = 0; //书本不可借
}
// printf("\t\t测试段错误用\n");
//给这个学生的书名分配内存
g_student[sturesult]->book[g_student[sturesult]->count] = (char*)malloc(sizeof(char)*128);
if (NULL == g_student[sturesult]->book)
{
printf("malloc failure!\n");
return;
}
strcpy(g_student[sturesult]->book[g_student[sturesult]->count],name1);
/*sturesult: 由于前部分result一开始代表的是学号下标，后来改成了书名下标，这里取学号下标保存 */
g_student[sturesult]->count++;
printf("\t\t借书成功！\n");
}
}
}
}
}
}
/*
函数描述：根据学号以及书名确定还书情况
函数参数：无
函数返回值：无
*/
void Payback()
{
int id,sturesult,bookresult=-1,i;
char name[32] = {0};
printf("\t\t请输入学号：\n");
scanf("%d",&id);
//判断学号是否存在
sturesult = TraverseStudent(id);
if (sturesult == -1)
{
printf("\t\t学号有误！\n");
return;
}
else
{
printf("\t\t你要还哪本书？\n");
scanf ("%s",name);
//判断书是否存在
for(i = 0;i < g_student[sturesult]->count;i++)
{ //判断书名与所借书名是否相同
if (strcmp(name,g_student[sturesult]->book[i]) == 0)
{
bookresult = i;
break;
}
}
if ( bookresult == -1)
{
printf("\t\t你没有借过这本书!\n");
}
else
{
//学生书名删除
for (i = bookresult;i<g_student[sturesult]->count;i++)
{
g_student[sturesult]->book[i]=g_student[sturesult]->book[i+1];
}
g_student[sturesult]->count--;//学生借书册数减一
int x = TraverseBook(name);
g_book[x]->count++; //图书馆书加一
printf("\t\t还书成功！\n");
}
}
}
/*
函数描述：根据输入学号查看该学生的借书情况
函数参数：无
函数返回值：无
*/
void Status()
{
int id,result,i;
printf("\t\t请输入你的学号：\n");
scanf("%d",&id);
result= TraverseStudent(id);
if (-1 == result)
{
printf("\t\t该学号不存在！\n");
}
else
{
printf("\t\t借书数量：%d\n",g_student[result]->count);
for(i = 0;i < g_student[result]->count;i++)
{
printf("\t\t书名：%s\n",g_student[result]->book[i]);
}
}
}
int main()
{
char choice[2] = {0};
init();
while (1)
{
menu();
scanf("%s", choice);
switch(choice[0])
{
case '1':
AddBook();
sleep(4);
break;
case '2':
DeleteBook();
sleep(4);
break;
case '3':
ShowBook();
break;
case '4':
SearchBook();
sleep(4);
break;
case '5':
BorrowBook();
sleep(4);
break;
case '6':
Payback();
sleep(4);
break;
case '7':
Status();
sleep(4);
break;
case '8':
exit(0);
break;
}
}
return 0;
}

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