分文件编程

#include "fun.h"

int main(int argc, const char *argv[])
{
	int role;
	while(1)
	{
		printf("|***************************|\n");
		printf("|*     1.商家    2.顾客    *|\n");
		printf("|***************************|\n");
		//scanf("%d", &role);
		scanf("%d", &role);
		if (role == merchant)
		{
			//printf("it is merchant\n");
			menu_merchant();
		}
		else if (role == customer)
		{
			//printf("it is customer\n");
			menu_customer();
		}
		else
		{
			printf("your input error\n");
		}
	}

	return 0;
}

/*
 * 头文件中一般放的内容
 * 1、结构体、共用体、枚举的定义
 * 2、宏定义
 * 3、函数声明
 * 一般全局变量不会放这里
 */

#ifndef _FUN_H_
#define _FUN_H_

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

//角色的数据类型
enum
{
	merchant = 1,
	customer,
	//}role;
	};

//商家的数据类型
enum
{
	list = 1,
	modify,
	purchase,
	sales,
	quit,
};

//顾客的数据类型
enum
{
	//list,
	shopping_cart = 2,
	quit1,
};

//商品的数据类型
struct goods
{
	int num;
	char name[64];
	int quantity;
	float price;
};
/*
goods[64] = {\
	{1, "苹果", 10, 2.5},\
	{2, "香蕉", 20, 3.5},\
	{3, "橘子", 4, 5},\
};
//存储商品的数量，随时维护
int n = 3;  

//存储销售额
float Sales = 0;
*/
void menu_merchant();
void menu_customer();
void list_goods();
void modify_goods();
void purchase_goods();
void shopping_goods();

#endif

/*
 * 一般存放对应头文件中声明的函数的实现
 */
//#include <stdio.h>
//#include <string.h>
#include "fun.h"


struct goods goods[64] = {\
	{1, "苹果", 10, 2.5},\
	{2, "香蕉", 20, 3.5},\
	{3, "橘子", 4, 5},\
};
//存储商品的数量，随时维护
int n = 3;  

//存储销售额
float Sales = 0;

void menu_merchant()
{
	int m;
MENU_MERCHANT:
	printf("|***************************|\n");
	printf("|*        1.查看库存       *|\n");
	printf("|*        2.修改商品       *|\n");
	printf("|*        3.采购订单       *|\n");
	printf("|*        4.查看销售额     *|\n");
	printf("|*        5.退出           *|\n");
	printf("|***************************|\n");
	scanf("%d", &m);
	if (m == list)
	{
		//printf("list\n");
		list_goods();
		goto MENU_MERCHANT;
	}
	else if (m == modify)
	{
		//printf("modify\n");
		modify_goods();
		goto MENU_MERCHANT;
	}
	else if (m == purchase)
	{
		//printf("purchase\n");
		purchase_goods();
		goto MENU_MERCHANT;
	}
	else if (m == sales)
	{
		printf("sales is %.2f\n", Sales);
		goto MENU_MERCHANT;
	}
	else if (m == quit)
	{
	}
	else
	{
		printf("your input error\n");
		goto MENU_MERCHANT;
	}
}

void menu_customer()
{
	int c;
MENU_CUSTOMER:
	printf("|***************************|\n");
	printf("|*        1.商品列表       *|\n");
	printf("|*        2.购物车         *|\n");
	printf("|*        3.退出           *|\n");
	printf("|***************************|\n");
	scanf("%d", &c);
	if (c == list)
	{
		//printf("list\n");
		list_goods();
		goto MENU_CUSTOMER;
	}
	else if (c == shopping_cart)
	{
		shopping_goods();
		//printf("shopping_cart\n");
		goto MENU_CUSTOMER;
	}
	else if (c == quit1)
	{
	}
	else
	{
		printf("your input error\n");
		goto MENU_CUSTOMER;
	}
}

void list_goods()
{
	int i;
	printf("num\tname\tquantity\tprice\n");
	for(i = 0; i < n; i++)
	{
		printf("%d\t%s\t%d\t\t%.2f\n",\
				goods[i].num, goods[i].name, goods[i].quantity, goods[i].price);
	}
}

void modify_goods()
{
	int num, quantity;
	float price;

	list_goods();
	printf("please input goods`s num: ");
	scanf("%d", &num);

	for(int i = 0; i < n; i++)
	{
		if(goods[i].num == num)
		{
			printf("please input goods`s quantity and price: ");
			scanf("%d%f", &quantity, &price);
			goods[i].quantity = quantity;
			goods[i].price = price;
			printf("modify goods success\n");
		}
	}
}

void purchase_goods()
{
	char s[16];
	printf("num\tname\tquantity\tprice\n");
	for(int i = 0; i < n; i++)
	{
		if(goods[i].quantity <= 5)
		{
			printf("%d\t%s\t%d\t\t%.2f\n",\
					goods[i].num, goods[i].name, goods[i].quantity, goods[i].price);
			printf("whether to purchase, please input yes or no: ");
			scanf("%s",s);
			if (strncmp(s, "yes", 3) == 0)
			{
				goods[i].quantity += 10;
				printf("purchase goods success\n");
			}
		}
	}
}

void shopping_goods()
{
	int num, quantity;

	list_goods();
	printf("please input goods`s num and quantity,# end\n");
	while(1)
	{
		if (scanf("%d%d", &num, &quantity) == 2)
		{
			for (int i = 0; i < n; i++)
			{
				if (goods[i].num == num)
				{
					Sales += goods[i].price * quantity;
					goods[i].quantity -=quantity;
				}
			}
		}
		else
		{
			while(getchar()!= '\n');
			break;
		}
	}
}