first program

图书馆借书代码

#define _CRT_SECURE_NO_WARNINGS

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

int book_num = 0;

struct Book  //书籍数据库
{
	int id;
	char name[20];
	int state;
}book[50];

void book_panel(void)  //书籍显示
{
	printf("=======网上图书馆=======


书籍编号    书籍名字    状态（1可借阅/2已借阅）

");
	for (int i = 0; i < book_num; i++)
	{
		printf("%d		%s		%d
", book[i].id, book[i].name, book[i].state);
	}
	printf("

=====================

");
}

int if_book_id(int id) //判断编号
{
	for (int i = 0; i < book_num; i++)
	{
		if (id == book[i].id)
		{
			return 1;
		}
	}
	return 0;
}

int if_book_name(char name[]) //判断书籍名称
{
	int ret = 0;
	for (int i = 0; i < book_num; i++)
	{
		ret = strcmp(name, book[i].name);
		if (ret == 0)
		{
			return 1;
		}
	}
	return 0;
}

void panel(void)  //开始界面
{
	printf("=======网上图书馆=======


  请选择你的身份：

（1）管理员（2）学生
 (3) 退出


");
} 

void drop(void) //还书界面
{
	int num = 0;
	printf("

=======还书界面=======

请输入归还书籍编号：

");
	scanf("%d", &num);
	for (int i = 0; i < book_num; i++)
	{
		if (num == book[i].id)
		{
			book[i].state = 1;
			break;
		}
	}
}

void lend(void) //借书界面
{
	int num = 0;
	printf("

=======借书界面=======

请输入借书籍编号：

");
	scanf("%d", &num);
	for (int i = 0; i < book_num; i++)
	{
		if (num == book[i].id)
		{
			book[i].state = 2;
			break;
		}
	}
}

int add(void)  //添加书籍界面
{
	if (book_num == 50)
	{
		printf("添加失败
已达最大图书储存数量

");
		system("pause");
		return 0;
	}
	printf("==请输入书籍编号==
");
	scanf("%d", &book[book_num].id);
	if (if_book_id(book[book_num].id) == 1)
	{
		printf("添加失败
该编号已存在

");
		system("pause");
		return 0;
	}
	printf("==请输入书籍名字==
");
	scanf("%s", &book[book_num].name);
	getchar();
	if (if_book_name(book[book_num].name) == 1)
	{
		printf("该书已存在

");
		system("pause");
		return 0;
	}
	printf("==请选择书籍状态==
(1)未借阅 （2）已借阅
");
	scanf("%d", &book[book_num].state);
	if (book[book_num].state != 1 && book[book_num].state != 2)
	{
		printf("错误操作
");
		system("pause");
		return 0;
	}
	else
	{
    printf("===添加已完成===
");
	book_num++;
	system("pause");
	return 0;
	}

}

int del2(int id) //删除操作
{
	int num = 0;
	if (if_book_id(id) != 1)
	{
		printf("

编号不存在
");
		system("pause");
		return 0;
	}
	for (int i = 0; i < book_num; i++)
	{
		if (id == book[i].id)
		{
			num = i;
			break;
		}
	}
	for (int i = num + 1; i < book_num; i++)
	{
		book[i - 1] = book[i];
	}
	book_num--;
	return 1;
}

int del(void)  //删除界面
{
	int num = 0;
	printf("==请选择你要删除编号(-1退出)==
");
	scanf("%d", &num);
	if (num == -1)
	{
		printf("

===退出成功===
");
		system("pause");
		return 0;
	}
	else
	{
		if (del2(num) == 1) 
		{
		    printf("

===删除成功===
");
	        system("pause");
	    	return 0;
		}
		printf("

===删除失败===
");
		system("pause");
		return 0;
	}

}

int lookup(void) //查找界面
{
	int num = 0,num1=0;
	char num3[20];
	printf("请选择查找方式(-1 退出):

(1) 编号 （2）书名 （3）状态 

");
	scanf("%d", &num);
	if (num == -1)
	{
		printf("

===退出成功===
");
		system("pause");
		return 0;
	}
	if (num == 1)
	{

		printf("请输入书籍编号：");
		scanf("%d", &num1);
		for (int i = 0; i < book_num; i++)
		{
			if (num1 == book[i].id)
			{
				printf("%d 		%s 		%d
", book[i].id, book[i].name, book[i].state);
				system("pause");
				return 0;
			}
			else
			{
				printf("此书暂时无法借阅
");
				system("pause");
				return 0;
			}
		}
	}
	else if (num == 2)
	{

		printf("请输入书名：");
		scanf("%s", &num3);
		for (int i = 0; i < book_num; i++)
		{
			if (strcmp(num3, book[i].name)==0)
			{
				printf("%d 		%s 		%d
", book[i].id, book[i].name, book[i].state);
				system("pause");
				return 0;
			}
			else
			{
				printf("此书暂时无法借阅
");
				system("pause");
				return 0;
			}
		}
	}
	else if(num==3)
	{
		printf("请输入书籍状态(1未借阅/2已借阅）：");
		scanf("%d", &num1);
		for (int i = 0; i < book_num; i++)
		{
			if (num1 == book[i].state)
			{
				printf("%d 		%s 		%d
", book[i].id, book[i].name, book[i].state);
			}
		}
		system("pause");
		return 0;
	}
	else
	{
		printf("没有此操作
");
		system("pause");
		return 0;
	}

}

int change(void) //修改界面
{
	int num1 = 0;
	printf("==请选择你要修改编号(-1退出)==
");
	scanf("%d", &num1);
	if (num1 == -1)
	{
		printf("

===退出成功===
");
		system("pause");
		return 0;
	}
		if (del2(num1) == 1)
		{
			add();
			return 0;
		}
}

void sort(void) //排序操作
{
	int num = 0;
	for (int j = 1; j < book_num; j++) 
	{
	    for (int i = 1;i <book_num; i++)
	    {
			if (book[i - 1].id > book[i].id)
			{
				num = book[i - 1].id;
				book[i - 1].id = book[i].id;
				book[i].id = num;
		    }
	    }
	}
	printf("

===完成排序===
");
	system("pause");
}

void administrator2(void)
{
	printf("=========管理界面=========


请选择你的操作

(1）添加 （2）删除 （3）查找
(4) 修改 （5）排序(6）退出
 ");
}

void administrator(void)  //管理界面
{
	book_panel();
	int num = 0;
	administrator2();
	while (num != 6)
	{
		scanf("%d", &num);
		switch (num)
		{
		case 1:add(); system("cls"); book_panel(); administrator2(); break;
		case 2:del();  system("cls"); book_panel(); administrator2(); break;
		case 3:lookup(); system("cls"); book_panel(); administrator2(); break;
		case 4:change(); system("cls"); book_panel(); administrator2(); break;
		case 5:sort(); system("cls"); book_panel(); administrator2(); break;
		case 6:printf("退出程序中
"); system("pause"); break;
		default:
			printf("没有此操作
"); system("pause"); system("cls"); book_panel(); administrator2(); break;
		}
	}

}

void student2(void)
{
	printf("========学生界面=======


请选择你的操作

(1) 还书 （2）借书 （3）退出
");
}

void student(void) //学生界面
{
	book_panel();
	int num = 0;
	student2();
	while (num != 3)
	{
		scanf("%d", &num);
		switch (num)
		{
		case 1:drop(); system("pause"); system("cls"); book_panel(); student2(); break;
		case 2:lend(); system("pause"); system("cls"); book_panel(); student2(); break;
		case 3:printf("退出程序中
"); system("pause"); break;
		default:
			printf("没有此操作
"); system("pause"); system("cls"); book_panel(); student2(); break;
		}
	}
}

int main()
{
	int num = 0;
	panel();
	while (num != 3)
	{
		scanf("%d", &num);
	    switch (num)
	    {
		case 1:system("cls"); administrator(); system("cls"); panel(); break;
	     case 2:system("cls");student(); system("cls"); panel(); break;
		 case 3:printf("退出程序中
"); system("pause"); break;
		 default:printf("没有此操作
"); system("pause"); system("cls"); panel(); break;
	    }
	}

}

总结：

1.该代码的个个界面不是很好，可以再次优化；

2.在写代码时多次卡壳，思路不是很清晰；

3.做为所写的第一个程序，我对于他的表现不是很好，可能是写之前对于他的期待太高；

4.下次再写代码之前一定要想好主要的功能，在写的时候再去想每个功能要如何去写。我在写这个程序之前花了一天时间去想如何写，这是不好的，下次要改正。