C语言——图书管理系统（不带文件操作） 2021-05-17

Posted 2021-07-14 超霸霸

说明：这是本人2021年寒假在家写的一个C语言大作业，供大家参考，写的不好的地方大家指正，有需要的朋友可以拿走，题目要求如下：

代码如下：

#include<stdio.h> 
#include<stdlib.h>
#include<time.h>

struct Number
{
	char alph;
	int num;
};

struct Book
{
	char title[128];
	char public[128];
	char author[128];
	int price;
    struct Number number;
	struct Book *next;
};

void menu() 
{
	printf("=====菜单=====\\n");
	printf("1.插入书包\\n");
	printf("2.删除书本\\n");
	printf("3.修改书本\\n");
	printf("4.打印书籍信息\\n");
	printf("5.退出\\n");
	printf("请输入你要执行的操作：");
}

void inseart(struct Book **head)
{
	srand(time(0));
	struct Book *previous;
	struct Book *current;
	struct Book *new;
	new=(struct Book*)malloc(sizeof(struct Book));
	int num=rand()%900000+100000;
	int alph=rand()%26;
	alph+='A';
	new->number.num=num;
	new->number.alph=alph;
	printf("请输入书名：");
	scanf("%s",&new->title);
	printf("请输入出版社：");
	scanf("%s",&new->public);
	printf("请输入作者：");
	scanf("%s",&new->author);
	printf("请输入价格：");
	scanf("%d",&new->price);
	current=*head;
	previous=NULL;
	while((current!=NULL)&&(current->number.num>num))
	{
		previous=current;
		current=current->next;
	}
	new->next=current;
	if(previous==NULL)
	{
		*head=new;
	}
	else
	{
		previous->next=new;
	}
}

void delete(struct Book **head)
{
	int num;
	printf("请输入你要删除的书的编号(数字部分)：");
	scanf("%d",&num);
	struct Book *previous;
	struct Book *current;
	current=*head;
	previous=NULL;
	while(current!=NULL&&current->number.num!=num)
	{
		previous=current;
		current=current->next;
	}
	if(current==NULL)
	{
		printf("找不到匹配的结点\\n");
		return;
	}
	else
	{
		if(previous==NULL)
		{
			*head=current->next;
		}
		else
		{
			previous->next=current->next;
		}
		free(current);
		printf("删除成功！\\n");
	}
}

void print(struct Book *head)
{
	struct Book *book;
	int cnt=1;
	book=head;
	while(book!=NULL)
	{
		printf("Book%d\\n",cnt);
		printf("书名：%s\\n",book->title);
		printf("出版社：%s\\n",book->public);
		printf("作者：%s\\n",book->author);
		printf("价格：%d\\n",book->price);
		printf("编号：%c%d\\n",book->number.alph,book->number.num);
		book=book->next;
	}
	printf("========\\n");
}

void modify(struct Book *head)
{
	int num;
	struct Book *book;
	book=head;
	printf("请输入你要修改的书籍的编号(数字部分)：");
	scanf("%d",&num);
	while(book->number.num!=num)
	{
		book=book->next;
	}
	if(book==NULL)
	{
		printf("很抱歉没有找到书籍信息，你输入的编号有误\\n");
	}
	else
	{
		printf("已找到你要修改的书籍.....\\n");
    	printf("书名：%s\\n",book->title);
    	printf("出版社：%s\\n",book->public);
     	printf("作者：%s\\n",book->author);
	    printf("价格：%d\\n",book->price);
    	printf("编号：%c%d\\n",book->number.alph,book->number.num);
		modifybook();
		int get;
		scanf("%d",&get);
		if(get==1)
		{
			printf("请输入修改后的书名：");
			scanf("%s",&book->title);
		}
		else if(get==2)
		{
			printf("请输入修改后的出版社：");
			scanf("%s",&book->public);
		}
		else if(get==3)
		{
			printf("请输入修改后的作者：");
			scanf("%s",&book->author);
		}
		else if(get==4)
		{
			printf("请输入修改后的价格：");
			scanf("%d",&book->price);
		}
		printf("修改成功！\\n");
	} 
}

void modifybook()
{
	printf("=====请选择要修改的信息=====\\n");
	printf("1.书名\\n");
	printf("2.出版社\\n");
	printf("3.作者\\n");
	printf("4.价格\\n");
	printf("请输入："); 
}

void release(struct Book *head)
{
	struct Book *book;
	book=head;
	while(book!=NULL)
	{
		free(book);
		book=book->next;
	}
}

int main(void)
{
	struct Book *head=NULL;
	while(1)
	{
		int ch;
		menu();
		scanf("%d",&ch);
		if(ch==1)
		{
			inseart(&head);
		}
		else if(ch==2)
		{
			delete(&head);
		}
		else if(ch==3)
		{
			modify(head);
		}
		else if(ch==4)
		{
			print(head);
		}
		else if(ch==5)
		{
			break;
		}
		else
		{
			printf("你输入的操作有误\\n");
		}
	}
	release(head);
	return 0;
}