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

struct Book{
	char bno[10];
	char bname[20];
	float bprice;
	char bauther[20];
}books[100] = {{"B001", "程序设计", 45.5f, "里已"}, {"B002", "python程序设计", 20.5f, "Pinpe"}, {"B003", "renpy游戏开发", 32.5f, "李四"}, {"B004", "数据库使用", 47.5f, "王五"}, {"B005", "java入门", 80.5f, "张柳"}};
int bsum = 5;  // 图书数量

// 显示主菜单
void dismenu(){
	printf("=====欢迎来到图书管理系统=====\n");
	printf("1. 查询图书\n");
	printf("2. 添加图书\n");
	printf("3. 修改图书\n");
	printf("4. 删除图书\n");
	printf("5. 退出\n");
	printf("==============================\n\n");
	printf(">>> ");
}

// 显示查询菜单
void disselmenu(){
	printf("===========查询图书===========\n");
	printf("1. 查询所有图书\n");
	printf("2. 按书名模糊查询\n");
	printf("3. 按书价区间查询\n");
	printf("4. 返回\n");
	printf("==============================\n\n");
	printf(">>> ");
}


// 查询图书
void selbook(){
	while(1){
		disselmenu();
		int selno;
		scanf("%d", &selno);
		switch (selno) {
			case 1:
				printf("%10s%20s%10s%10s\n", "图书编号", "图书名称", "图书价格", "图书作者");
				for(int i=0;i<bsum;i++){
					printf("%10s%20s%6.2f%10s\n", books[i].bno, books[i].bname, books[i].bprice, books[i].bauther);
				}
				break;
			case 2:
				printf("请输入要查询的书名：");
				char selname[20];
				scanf("%s", selname);
				printf("%10s%20s%10s%10s\n", "图书编号", "图书名称", "图书价格", "图书作者");
				for(int i=0;i<bsum;i++){
					if(strstr(books[i].bname, selname)){
						printf("%10s%20s%6.2f%10s\n", books[i].bno, books[i].bname, books[i].bprice, books[i].bauther);
					}
				}
				break;
			case 3:{
				float a, b;
				printf("请输入价格区间：");
				scanf("%f%f", &a, &b);
				printf("%10s%20s%10s%10s\n", "图书编号", "图书名称", "图书价格", "图书作者");
				for(int k=0;k<bsum;k++){
					if(books[k].bprice >=a && books[k].bprice <= b){
						printf("%10s%20s%6.2f%10s\n", books[k].bno, books[k].bname, books[k].bprice, books[k].bauther);
					}
				}
				break;
			}
			case 4:
				printf("是否退出？（y/n）");
				char ch;
				scanf("%c", &ch);
				scanf("%c", &ch);
				if(ch == 'y' || ch == 'Y'){
					return;
				}

		}
	}
}

// 添加图书
void addbook(){
	while(1){
		printf("请输入书号：");
		scanf("%s", books[bsum].bno);
		printf("请输入书名：");
		scanf("%s", books[bsum].bname);
		printf("请输入书价：");
		scanf("%f", &books[bsum].bprice);
		printf("请输入作者：");
		scanf("%s", books[bsum].bauther);
		bsum++;
		printf("添加成功\n\n");
		printf("是否继续添加？（y/n）");
		char ch;
		scanf("%c", &ch);
		scanf("%c", &ch);
		if(ch == 'n' || ch == 'N'){
			return;
		}
	}
}

// 修改图书
void modifybook(){
	while(1){
		printf("请输入需要修改的书号：");
		char selno[10];
		scanf("%s", selno);
		int i;
		for(i=0;i<bsum;i++){
			if(strcmp(books[i].bno, selno) == 0){
				break;
			}
		}
		printf("书号%s的原价为%6.2f，输入新的价格：", selno, books[i].bprice);
		scanf("%f", &books[i].bprice);
		printf("修改成功\n\n");
		printf("是否继续修改？（y/n）");
		char ch;
		scanf("%c", &ch);
		scanf("%c", &ch);
		if(ch == 'n' || ch == 'N'){
			return;
		}
	}
}

// 删除图书
void delbook(){
	while(1){
		printf("请输入需要删除的书号：");
		char selno[10];
		scanf("%s", selno);
		int i;
		for(i=0;i<bsum;i++){
			if(strcmp(books[i].bno, selno) == 0){
				break;
			}
		}
		int j;
		for(int j = i; j < bsum - 1; j++) {
                    books[j] = books[j + 1]; // 整体复制结构体
                }
		bsum--;
		printf("删除成功\n\n");
		printf("是否继续删除？（y/n）");
		char ch;
		scanf("%c", &ch);
		scanf("%c", &ch);
		if(ch == 'n' || ch == 'N'){
			return;
		}
	}
}

int main(){
	while(1){
		dismenu();
		int selon;
		scanf("%d", &selon);
		switch (selon) {
			case 1:
				selbook();
				break;
			case 2:
				addbook();
				break;
			case 3:
				modifybook();
				break;
			case 4:
				delbook();
				break;
			case 5:
				printf("是否退出？（y/n）");
				char chexit;
				scanf("%c", &chexit);
				scanf("%c", &chexit);
				if(chexit == 'Y' || chexit == 'y'){
					return 0;
				}
		}
	}
	return 0;
}