C语言实现简易商城交易功能

#include 
#include 
#include 


//商品结构-名称、单价、库存量、描述
typedef struct _prop
{
    int id;         //道具的唯一编号
    char name[50];  //道具名称
    double price;   //道具单价
    int stock;      //库存量，如果在背包中代表此道具的叠加数量
    char desc[200]; //道具描述
}Prop;

//背包结构-玩家编号、游戏道具[商品数组]、道具数量、最大道具数
typedef struct _bag
{
   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-插槽数量可以让用户用rmb购买
   Prop props[18];  //当前背包中的道具数组
}Bag;

//玩家结构-编号、名称、密码、金钱【背包】
typedef struct _player
{
    int id;         //玩家编号
    char name[50];  //用户名
    char pass[50];  //密码
    Bag bag;        //玩家的背包
    double gold;    //玩家金币-人性化显示：100000转换成银币、铜币显示
    double sysee;   //元宝数量
}Player;
Prop *props;
Player *players;
int propsCount = 0;
int playerCount = 0;
void Init();        //用来初始化游戏数据
void ShowProps();
void ShowPlayers();
//交易函数


void Trade(Player *player, int propId);
int i,j;	//循环变量

int main()
{
    printf("n* * * * * * * * * * * * * * * * 交  易  前 * * * * * * * * * * * * * * * * * * * * * *nn");
    //1，初始化数据
    Init();
    //2，打印这些初始化数据
    ShowProps();
    ShowPlayers();

    printf("n* * * * * * * * * * * * * * * * 交  易  后 * * * * * * * * * * * * * * * * * * * * * *nn");
    Trade(&players[2],2);
    Trade(&players[2],3);
    Trade(&players[1],3);
    Trade(&players[2],1);
    ShowProps();
    ShowPlayers();
    system("color 2");
    return 0;
}
void Init()
{
    static Prop propArray[] = {
        {1, "无尽之刃", 3000, 10, "增加暴击8000！"},
        {2, "泣血之刀", 2800, 10, "增加吸血600！"},
        {3, "抵抗之靴", 200, 10, "增加移速53%，魔抗24%！"},
        {4, "贤者之书", 3200, 10, "增加法力2000！"},
        {5, "破军之刀", 3500, 10, "增加物理攻击50%！"},
        //{6, "黎明破晓", 1800, 10, "增加射速25%！"},
    };
    propsCount = sizeof(propArray) / sizeof(Prop);
    props = propArray;  //设定指针的指向
    static Player playArray[] = {
        {1, "laity  ", "sucessful", .gold = 50000, .bag.max=8},
        {2, "dull   ", "dull2022", .gold = 150000, .bag.max=8},
        {3, "emperor", "emperor22", .gold = 173000, .bag.max=8},
        {4, "fantasy", "fatasy1983", .gold = 15900, .bag.max=8}
    };
    players = playArray;
    playerCount = sizeof(playArray) / sizeof(Player);
}
void ShowProps()
{
    if(props == NULL)
        return;

    printf("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *n");
    printf("*tttt商    城                                      *n");
    printf("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *n");
    printf("* %st  名称tt 单价tt库存tt  商品介绍            *n","编号");
    printf("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *n");
    for(int i = 0;i < propsCount;i++)
    {
        printf("*  %dt%st%.2lftt %dtt%s*n",props[i].id,props[i].name,props[i].price,props[i].stock,props[i].desc);
        printf("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *n");
    }
}
void ShowPlayers()
{
    if(players == NULL)
        return;
    printf("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *n");
    printf("*ttt     玩 家 信 息                                      *n");
    printf("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *n");
    printf("* 编号t 用户名tt 密码ttt   金币ttt元宝  *n");
    printf("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *n");
    for(int i = 0;i < playerCount;i++)
    {
        printf("*  %dt %st%stt %.2lftt%.2lf*n",players[i].id,players[i].name,players[i].pass,players[i].gold,players[i].sysee);
        printf("* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *n");
        for(j = 0;j < players[i].bag.count;j++)
        {
            printf("t%st%dtn",players[i].bag.props[j].name, players[i].bag.props[j].stock);
        }
        printf("n");
    }
}
void Trade(Player *player, int propId)
{
    //商品库存，玩家余额，玩家背包能否装下
    Prop *tradeProp = NULL;    //要购买的商品指针
    for(i = 0;i < propsCount;i++)
    {
        if(propId == props[i].id)
        {
            tradeProp = &props[i];  //数组中第i个元素的地址
            break;
        }
    }
    if(tradeProp->stock <= 0)
    {
        printf("地主家都没有余粮，商品已售磐！n");
        return;
    }
    if(player->gold < tradeProp->price)
    {
        printf("你个穷鬼，连钱都没有还来购买商品！n");
        return;
    }
    if(player->bag.count >= player->bag.max && player->bag.count != 0)
    {
        printf("背包已满，交易失败！n");
        return;
    }
    //满足交易条件，执行交易操作
    //1,商品库存-1
    tradeProp->stock--;
    //2,玩家金币-商品单价
    player->gold -= tradeProp->price;
    //3,玩家背包道具增加
    //判断玩家背包中是否已经有该商品
    //如果有，背包中的该商品总数+1
    for(i = 0;i < player->bag.count;i++)
    {
        //如果要购买的商品id与背包中的某个商品id相同
        if(propId == player->bag.props[i].id)
        {
            player->bag.props[i].stock++;
            break;
        }
    }
    //如果没有该商品，添加该商品
    if(i == player->bag.count)
    {
        //向背包中创建一个商品 -> 复制一份要交易的商品信息到背包中
        player->bag.props[player->bag.count].id = tradeProp->id;
        player->bag.props[player->bag.count].price = tradeProp->price;
        player->bag.props[player->bag.count].stock = 1;
        strcpy(player->bag.props[player->bag.count].name,tradeProp->name);
        strcpy(player->bag.props[player->bag.count].desc,tradeProp->desc);
        player->bag.count++;
    }
}

最终效果