C 购买商品的游戏

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
 *模拟实现道具店购物功能（商店暂时只支持一种类型的商品）
 *商品具备名称，价格，库存等属性
 *模拟玩家购买游戏道具
 *1.玩家选择要购买的道具
 *2.玩家同意交易后扣除相应的游戏币
 *3.对应商品库存-1
 *4.玩家背包中增加商品或该商品数量+1
*/


//定义结构
//1.商品结构-名称，单价，库存量，描述
//2.背包结构-玩家编号，名称，商品[10],道具数量，最大道具数
//3.玩家结构-编号，名称，密码，金钱，【背包】

typedef struct _props    //商品结构
{
    int id;              //道具编号
    char name[50];       //道具名称
    double price;        //道具单价
    int stock;           //库存量：如果再背包中，表示次道具的叠加数量
    char desc[200];      //道具的功能描述

}Props;



typedef struct _bag    //背包结构
{

    int  playerId;      //所属玩家的编号
    int count ;         //当前背包中，道具的数量
    int max;            //当前背包的插槽总数
    Props props[8];      //当前背包中的道具数组,可购买

}Bag;

typedef struct _players                        //玩家结构
{
    int id;               //玩家编号
    char name[50];        //用户名/昵称
    char pass[50];        //密码
    Bag bag;              //玩家的背包
    double gold;         //玩家金币-人性显示：可以将100000铜币转化成银币，金币显示
    double sysee;        //元宝数量


}Players;

Props *props;
Players *players;

void Init();          //用来初始化游戏数据
void ShowProps();
void ShowPlayers();
//交易函数 参数1.参与交易玩家指针-为了方便修改玩家交易后的金币数
         //参数2.玩家购买商品的ID
void Trade(Players *players,int propsId);

//全局变量 默认值= 0
int propsCount = 0;
int playersCount = 0;



int main()
{

    //初始化游戏数据
    Init();
    printf("\n****************交易前******************\n");

    //打印这些初始化数据
    ShowProps();

    ShowPlayers();

    printf("\n\n****************交易结果******************\n\n");
    Trade(&players[0],3);  Trade(&players[0],4);
    Trade(&players[0],3);
    Trade(&players[0],5);


    Trade(&players[2],5);


    printf("\n\n****************交易后******************\n");
    ShowProps();

    ShowPlayers();
    return 0;
}

//交易函数 参数1.参与交易玩家指针-为了方便修改玩家交易后的金币数
         //参数2.玩家购买商品的ID
void Trade(Players *players,int propsId)
{
    int i ;
    //需要判断：1.玩家商品的库存，2.玩家的余额3.玩家背包的空间够不够
    Props *tradeProps = NULL; //需要购买的商品指针
    for(i = 0; i <propsCount;i++)
    {
        if(propsId ==props[i].id)
        {
            tradeProps = &props[i]; //tradeProps = props + i;
            break;
        }
    }

    if(tradeProps->stock <= 0 )   //指针访问结构体 ->
    {
        printf("商店都被买空了！！\n");
        return;

    }
    if(players->gold <tradeProps ->price)
    {
        printf("钱包里的钱是空的呦！！！交易失败！！！\n    ");
        return;
    }

    if(players->bag.count>= players->bag.max && players->bag.count != 0)
    {
        printf("背包已满，交易失败！！！！\n");
        return;

    }
    else
    {
        printf("恭喜您，交易成功！！！\n");
    }

    //满足交易条件，执行交易的业务操作
    //.商品库存-1
    tradeProps->stock--;
    //玩家金币-商品单价
    players ->gold -= tradeProps->price;
    //玩家背包道具增加

      //判断玩家背包中是否已有该商品
      //如果没有该商品，该商品添加背包中
      //如果有该商品，背包中的该商品数+1

      for(i = 0;i<players->bag.count;i++)
      {
          //如果购买的商品ID 跟 背包中的某个商品ID相同
          if(propsId == players->bag.props[i].id)
          {
              players->bag.props[i].stock++;
              break;

          }

      }
    //如果没有该商品，该商品添加背包中

      if(i == players->bag.count )
      {
          //向背包中创建一个商品-复制一份交易的商品信息到背包中
          int newIndex = players -> bag.count;
          players -> bag.props[newIndex].id = tradeProps->id;
          players -> bag.props[newIndex].price = tradeProps->price;
          players -> bag.props[newIndex].stock = 1;
          strcpy(players -> bag.props[newIndex].name,tradeProps->name);
          strcpy(players -> bag.props[newIndex].desc,tradeProps->desc);
          players->bag.count++;




     }



}

void Init()
{
        //初始化数据
  static  Props propsArray[] = {

        {1,"双倍经验卡",3000,10,"双击666"},
        {2,"无尽之刃",5000,8,"双倍暴击"},
        {3,"皮甲战衣",8000,10,"穿上很哇塞！"},
        {4,"禁锢鲁棒",13000,10,"变幻莫测的大棒子"},
        {5,"升级卡",83000,10,"吃了以后还想吃吃吃吃，再吃吃吃吃吃吃。。。"},

    };
   // propsCount = 5;
    propsCount = sizeof(propsArray) / sizeof(Props);
    props = propsArray;  //设定指针的指向
  static  Players playersArray[] = {
        {1,"德玛西亚之力","123456",.gold = 50000,.bag.max = 8},
        {2,"诺克萨斯之手","123456",.gold = 150000,.bag.max = 8},
        {3,"亚索哈塞给","123456",.gold = 500000,.bag.max = 8},
        {4,"永烈双子","123456",.gold = 1150000,.bag.max = 8},
    // {5,"马可波罗","123456",.gold = 50000,},

    };
    playersCount = 4;
    players = playersArray;

}



void  ShowProps()
{
   int i ;
   if((props == NULL))
   return;
   printf("%-15s%-20s%-17s%-12s%-12s\n","商品编号","商品名称","商品单价","商品库存","商品介绍");
   for(i = 0;i < propsCount;i++)
   {
       printf("%-15d%-20s%-17.0lf%-12d%-12s\n",props[i].id,props[i].name,props[i].price,props[i].stock,props[i].desc);

   }



}
void  ShowPlayers()
{
    int i,j ;
    if(players == NULL)
        return;
    printf("%-15s%-20s%-17s\n","玩家编号","玩家名称","玩家金币");
    for(i = 0; i < playersCount; i++)
    {
        printf("%-15d%-20s%-17.01f\n",players[i].id,players[i].name,players[i].gold);
        for(j = 0; j <players[i].bag.count;j++)
        {


            printf("\t%s\t%d\t",players[i].bag.props[j].name,players[i].bag.props[j].stock);
        }
        printf("\n");

    }



}