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数据结构——C语言版 图书管理系统(简陋版)

作者:互联网

数据结构——C语言版 图书管理系统(简陋版)

这是一个关于数据结构的博客,主要目的是综合运用C语言的知识,达到巩固之前所学的所有知识。以图书管理系统为例,做一个简陋版本的。此篇博客仅供参考,如有问题还请各路大神多多指教。

图书管理系统要求

在这里插入图片描述
(由于本人实力有限,选做部分功能并未实现,后期若有时间一定补上!)

Part-1 结构体定义

const int M=0x3f3f3f; //设置最大图书容量
typedef struct
{
	char ISBN[18]; //书号
	char name[50]; //书名
	double price;  //价格
}book;
book b[M],B;

Part-2 输出功能

void PrintBook()
{
	scls;
	FILE *fp; //文件基本操作
	if ((fp=fopen("book.txt","r"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		printf("xxxx大学图书馆图书采购列表\n");
		printf("ISBN	                  书名	                定价\n");
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		printf("%s\t\t%s\t%.2lf\n",b[0].ISBN,b[0].name,b[0].price);
		while ((fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price))==3)
			printf("%s\t\t%s\t%.2lf\n",B.ISBN,B.name,B.price);
	}
	fclose(fp);
	printf("已显示所有信息\n");
	sp;
	scls;
	return;
}

Part-3 插入功能

void Insert() //根据位置插入
{
	int length=0;
	scls;
	int i;
	char ISBN[18];
	char name[50];
	double price;
	printf("请输入插入位置:");
	scanf("%d",&i);
	printf("请输入图书信息书号:");
	scanf("%s",&ISBN);
	printf("请输入图书信息书名:");
	scanf("%s",&name);
	printf("请输入图书价格:");
	scanf("%lf",&price);
	FILE *fp,*fp_tmp;
	if ((fp=fopen("book.txt","r+"))==NULL||(fp_tmp=fopen("book_tmp.txt","w"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		int k=0,length=0;
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		while (!feof(fp))
		{
			k++;
			fscanf(fp,"%s%s%lf",&b[k].ISBN,&b[k].name,&b[k].price);
		}
		length=k; //统计当前列表的长度
		fclose(fp);
		for (int j=0;j<i-1;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
		fprintf(fp_tmp,"%s\t%s\t%.2lf\n",ISBN,name,price); //第i组数据在位置i-1上
		for (int j=i-1;j<=length;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
	}
	fclose(fp_tmp);
	remove("book.txt"); //删除原文件
	rename("book_tmp.txt","book.txt"); //重命名新文件
	printf("已添加该图书信息\n");
	sp;
	scls;
	return;
}

Part-4 删除功能

void Delete() //根据位置删除
{
	scls;
	int i;
	printf("请选择删除位置:");
	scanf("%d",&i);
	FILE *fp,*fp_tmp;
	if ((fp=fopen("book.txt","r+"))==NULL||(fp_tmp=fopen("book_tmp.txt","w"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		int k=0,length=0;
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		while (!feof(fp))
		{
			k++;
			fscanf(fp,"%s%s%lf",&b[k].ISBN,&b[k].name,&b[k].price);
		}
		length=k;
		fclose(fp);
		for (int j=0;j<i-1;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
		for (int j=i;j<=length;j++) //直接跳过第i-1组数据
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
	}
	fclose(fp_tmp);
	remove("book.txt");
	rename("book_tmp.txt","book.txt");
	printf("已删除该图书信息\n");
	sp;
	scls;
	return;
}

Part-5 查找功能

5.1 根据位置查找

void Find_Position()
{
	scls;
	int i;
	printf("请选择位置:");
	scanf("%d",&i);
	FILE *fp;
	if ((fp=fopen("book.txt","r"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		printf("ISBN	                  书名	                定价\n");
		int length=0;
		while (fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price)==3)
		{
			length++;
			if (length==i) //一个很不讲武德的写法
			{
				printf("%s\t\t%s\t%.2lf\n",B.ISBN,B.name,B.price);
				break;
			}
		}
	}
	fclose(fp);
	printf("已显示所有信息\n");
	sp;
	scls;
	return;
}

5.2 根据书名查找

void Find_Name() //如果书名相同,则输出全部同名信息
{
	scls;
	char name[50];
	printf("请输入书名:");
	scanf("%s",name);
	FILE *fp;
	if ((fp=fopen("book.txt","r"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		printf("ISBN	                  书名	                定价\n");
		fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price);
		while (!feof(fp))
		{
			if (strcmp(name,B.name)==0)
				printf("%s\t\t%s\t%.2lf\n",B.ISBN,B.name,B.price);
			fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price);
		}
	}
	fclose(fp);
	printf("已显示所有信息\n");
	sp;
	scls;
	return;
}

Part-6 修改价格

void Modify()
{
	scls;
	FILE *fp,*fp_tmp;
	if ((fp=fopen("book.txt","r+"))==NULL||(fp_tmp=fopen("book_newprice.txt","w"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		int k=0,length=0;
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		while (!feof(fp))
		{
			k++;
			fscanf(fp,"%s%s%lf",&b[k].ISBN,&b[k].name,&b[k].price);
		}
		length=k;
		fclose(fp);
		for (int i=0;i<=length;i++)
		{
			if (b[i].price<25.00)
				b[i].price*=1.2;
			else
				b[i].price*=1.1;
		}
		for (int j=0;j<length;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
	}
	fclose(fp_tmp);
	printf("已修改图书信息\n");
	sp;
	scls;
	return;
}

Part-7 排序——按价格从小到大排序

void Sort() //采用sort函数
{
	scls;
	FILE *fp,*fp_tmp;
	if ((fp=fopen("book.txt","r+"))==NULL||(fp_tmp=fopen("book_newsort.txt","w"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		int k=0,length=0;
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		while (!feof(fp))
		{
			k++;
			fscanf(fp,"%s%s%lf",&b[k].ISBN,&b[k].name,&b[k].price);
		}
		length=k;
		fclose(fp);
		sort(b,b+length+1,cmp);
		for (int j=1;j<=length;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
	}
	fclose(fp_tmp);
	printf("已重新排序\n");
	sp;
	scls;
	return;
}

bool cmp(const book& b1,const book& b2) //自定义cmp函数
{
	if (b1.price!=b2.price)
		return b1.price<b2.price;
}

—————————————————————————————————————————————
全部代码:

#include <bits/stdc++.h>
using namespace std;

#define scls system("cls")
#define sp system("pause")
const int M=0x3f3f3f;
typedef struct
{
	char ISBN[18];
	char name[50];
	double price;
}book;
book b[M],B;

void Init()
{
	int length=0;
	FILE *fp;
	if ((fp=fopen("book.txt","r"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		while (fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price)==3)
			length++;
	} 
	fclose(fp);
}
void Menu()
{
	printf("一个非常简陋的图书管理系统\n");
	printf("1.输出图书信息\n");
	printf("2.插入图书信息\n");
	printf("3.删除图书信息\n");
	printf("4.查找图书信息\n");
	printf("5.修改图书价格\n");
	printf("6.排序\n");
	printf("7.退出\n");
	printf("\n");
	printf("请选择服务:");
}
void Else()
{
	printf("指令无效,请重新输入!\n");
	sp;
	scls;
	return;
}
void PrintBook()
{
	scls;
	FILE *fp;
	if ((fp=fopen("book.txt","r"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		printf("北京林业大学图书馆计算机类图书采购列表\n");
		printf("ISBN	                  书名	                定价\n");
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		printf("%s\t\t%s\t%.2lf\n",b[0].ISBN,b[0].name,b[0].price);
		while ((fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price))==3)
			printf("%s\t\t%s\t%.2lf\n",B.ISBN,B.name,B.price);
	}
	fclose(fp);
	printf("已显示所有信息\n");
	sp;
	scls;
	return;
}
void Insert()
{
	int length=0;
	scls;
	int i;
	char ISBN[18];
	char name[50];
	double price;
	printf("请输入插入位置:");
	scanf("%d",&i);
	printf("请输入图书信息书号:");
	scanf("%s",&ISBN);
	printf("请输入图书信息书名:");
	scanf("%s",&name);
	printf("请输入图书价格:");
	scanf("%lf",&price);
	FILE *fp,*fp_tmp;
	if ((fp=fopen("book.txt","r+"))==NULL||(fp_tmp=fopen("book_tmp.txt","w"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		int k=0,length=0;
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		while (!feof(fp))
		{
			k++;
			fscanf(fp,"%s%s%lf",&b[k].ISBN,&b[k].name,&b[k].price);
		}
		length=k;
		fclose(fp);
		for (int j=0;j<i-1;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
		fprintf(fp_tmp,"%s\t%s\t%.2lf\n",ISBN,name,price);
		for (int j=i-1;j<=length;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
	}
	fclose(fp_tmp);
	remove("book.txt");
	rename("book_tmp.txt","book.txt");
	printf("已添加该图书信息\n");
	sp;
	scls;
	return;
}
void Delete()
{
	scls;
	int i;
	printf("请选择删除位置:");
	scanf("%d",&i);
	FILE *fp,*fp_tmp;
	if ((fp=fopen("book.txt","r+"))==NULL||(fp_tmp=fopen("book_tmp.txt","w"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		int k=0,length=0;
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		while (!feof(fp))
		{
			k++;
			fscanf(fp,"%s%s%lf",&b[k].ISBN,&b[k].name,&b[k].price);
		}
		length=k;
		fclose(fp);
		for (int j=0;j<i-1;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
		for (int j=i;j<=length;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
	}
	fclose(fp_tmp);
	remove("book.txt");
	rename("book_tmp.txt","book.txt");
	printf("已删除该图书信息\n");
	sp;
	scls;
	return;
}
void Find_Position()
{
	scls;
	int i;
	printf("请选择位置:");
	scanf("%d",&i);
	FILE *fp;
	if ((fp=fopen("book.txt","r"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		printf("ISBN	                  书名	                定价\n");
		int length=0;
		while (fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price)==3)
		{
			length++;
			if (length==i)
			{
				printf("%s\t\t%s\t%.2lf\n",B.ISBN,B.name,B.price);
				break;
			}
		}
	}
	fclose(fp);
	printf("已显示所有信息\n");
	sp;
	scls;
	return;
}
void Find_Name()
{
	scls;
	char name[50];
	printf("请输入书名:");
	scanf("%s",name);
	FILE *fp;
	if ((fp=fopen("book.txt","r"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		printf("ISBN	                  书名	                定价\n");
		fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price);
		while (!feof(fp))
		{
			if (strcmp(name,B.name)==0)
				printf("%s\t\t%s\t%.2lf\n",B.ISBN,B.name,B.price);
			fscanf(fp,"%s%s%lf",&B.ISBN,&B.name,&B.price);
		}
	}
	fclose(fp);
	printf("已显示所有信息\n");
	sp;
	scls;
	return;
}
void Find()
{
	scls;
	printf("1.按位置查找\n");
	printf("2.按书名查找\n");
	printf("请选择服务:");
	char x;
	scanf(" %c",&x);
	if (x=='1')
		Find_Position();
	else if (x=='2')
		Find_Name();
	else
		Else();
}
void Modify()
{
	scls;
	FILE *fp,*fp_tmp;
	if ((fp=fopen("book.txt","r+"))==NULL||(fp_tmp=fopen("book_newprice.txt","w"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		int k=0,length=0;
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		while (!feof(fp))
		{
			k++;
			fscanf(fp,"%s%s%lf",&b[k].ISBN,&b[k].name,&b[k].price);
		}
		length=k;
		fclose(fp);
		for (int i=0;i<=length;i++)
		{
			if (b[i].price<25.00)
				b[i].price*=1.2;
			else
				b[i].price*=1.1;
		}
		for (int j=0;j<length;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
	}
	fclose(fp_tmp);
	printf("已修改图书信息\n");
	sp;
	scls;
	return;
}
bool cmp(const book& b1,const book& b2)
{
	if (b1.price!=b2.price)
		return b1.price<b2.price;
}
void Sort()
{
	scls;
	FILE *fp,*fp_tmp;
	if ((fp=fopen("book.txt","r+"))==NULL||(fp_tmp=fopen("book_newsort.txt","w"))==NULL)
	{
		printf("文件不存在!\n");
		return;
	}
	else
	{
		int k=0,length=0;
		fscanf(fp,"%s%s%lf",&b[0].ISBN,&b[0].name,&b[0].price);
		while (!feof(fp))
		{
			k++;
			fscanf(fp,"%s%s%lf",&b[k].ISBN,&b[k].name,&b[k].price);
		}
		length=k;
		fclose(fp);
		sort(b,b+length+1,cmp);
		for (int j=1;j<=length;j++)
			fprintf(fp_tmp,"%s\t%s\t%.2lf\n",b[j].ISBN,b[j].name,b[j].price);
	}
	fclose(fp_tmp);
	printf("已重新排序\n");
	sp;
	scls;
	return;
}

int main()
{
	Init();
	while (true)
	{
		Menu();
		char x;
		scanf(" %c",&x);
		if (x=='1')
			PrintBook();
		else if (x=='2')
			Insert();
		else if (x=='3')
			Delete();
		else if (x=='4')
			Find();
		else if (x=='5')
			Modify();
		else if (x=='6')
			Sort();
		else if (x=='7')
			exit(0);
		else
			Else();
	}
	return 0;
}

标签:fp,ISBN,name,管理系统,price,C语言,printf,数据结构,s%
来源: https://blog.csdn.net/weixin_50961321/article/details/120358720