7. 股票撮合系统

朴灿烈づ我的快乐病毒、 2022-04-06 04:58 223阅读 0赞

## 7. 股票撮合系统 ##

在股票交易中，股民可以通过各种手段将委托送到股票交易所。每个委托主要说明了股民身份、买卖的股票、价格和数量。交易的规则是价格优先、时间优先，即出的价格最高的人先买，出的价格最低的人先卖。两个委托只有价格合适时才能成交，未成交的委托按价格顺序放在撮合队列中。每个股票有两个撮合队列：买队列和卖队列。只有当买委托的价格高于等于卖委托的价格，两个委托才可以成交，成交价取两个委托价格的平均值，成交量取两个委托数量的最小值。委托可以是完全成交或部分成交，部分成交的委托保留在撮合队列中继续交易。试利用单链表作为存放委托的数据结构（撮合队列），编写一模拟股票交易的程序，该程序有以下几个功能：

1. 委托申请：

输入：每个委托包括四个数据项，股票编码（ 4 位数字）、价格（浮点数）、数量（整数）、买 / 卖（ B/S ）

输出： a. 程序为每个委托产生一个唯一的序号（ %04d ），该序号从 1 开始； b. 每笔成交包括：成交价格（ %6.1f ）、成交量（ %4d ）、新的委托序号（ %04d ）、匹配的委托序号（ %04d ）。

2. 查询未成交的委托：

输入：股票编码

输出：按撮合队列中委托的顺序，分别输出该股票未成交的委托，每个输出的委托包括：委托序号（ %04d ）、 股票编码 （ %04d ） 、 价格（ %6.1f ）、数量（ %4d ）、 B/S （买 / 卖 )

3. 委托撤消：

输入：要撤消的委托号。

输出：若成功，显示该委托信息，其中委托包括数据项：委托序号、股票编码、价格、数量、 B/S （买 / 卖 ) ；否则显示“ not found ”失败信息。

**委托输入格式** ： 1 股票编码 价格 数量 买卖

**查询输入格式** ： 2 股票编码

**委托撤销** ： .3 委托号

**退出：** 0

**例：** （下面的黑斜体为输入, 输入输出格式参见测试用例）

***1 0038 20 1000 b***

*orderid: 0001*

***1 0278 18 2000 s***

*orderid: 0002*

***1 0003 8 5000 b***

*orderid: 0003*

***1 0003 12 1000 b***

*orderid: 0004*

***1 0003 10 500 b***

*orderid: 0005*

***1 0003 11 9000 b***

*orderid: 0006*

***1 0003 18 1000 s***

*orderid: 0007*

***2 0003***

*buy orders:*

*orderid: 0004, stockid:0003, price: 12.0, quantity: 1000, b/s: b*

*orderid: 0006, stockid:0003, price: 11.0, quantity: 9000, b/s: b*

*orderid: 0005, stockid:0003, price: 10.0, quantity: 500, b/s: b*

*orderid: 0003, stockid:0003, price: 8.0, quantity: 5000, b/s: b*

*sell orders:*

*orderid: 0007, stockid:0003, price: 18.0, quantity: 1000, b/s: s*

***3 0006***

*deleted order:orderid: 0006, stockid:0003, price: 11.0, quantity: 9000, b/s: b*

***3 0197***

*not found*

***2 0003***

*buy orders:*

*orderid: 0004, stockid:0003, price: 12.0, quantity: 1000, b/s: b*

*orderid: 0005, stockid:0003, price: 10.0, quantity: 500, b/s: b*

*orderid: 0003, stockid:0003, price: 8.0, quantity: 5000, b/s: b*

*sell orders:*

*orderid: 0007, stockid:0003, price: 18.0, quantity: 1000, b/s: s*

***1 0003 9 1200 s***

*orderid: 0008*

*deal--price: 10.5 quantity:1000 sellorder:0008 buyorder:0004*

*deal--price: 9.5 quantity: 200 sellorder:0008 buyorder:0005*

***2 0003***

*buy orders:*

*orderid: 0005, stockid:0003, price: 10.0, quantity: 300, b/s: b*

*orderid: 0003, stockid:0003, price: 8.0, quantity: 5000, b/s: b*

*sell orders:*

*orderid: 0007, stockid:0003, price: 18.0, quantity: 1000, b/s: s*

*注意：*

*1、当查询未成交委托时，如果没有委托，仍要输出“buy orders:”或“sell orders: ”。*

*2、输入的委托price>=0。*

*3、输入的委托quantity>=0，当接受一个新的委托时，首先根据委托的股票编码和价格与现有队列中的委托进行撮合，若撮合后有剩余的数量没有得到满足（即quantity>0），则将新委托插入到相应队列中。*

#include "stdio.h" 
    #include "stdlib.h" 
     
    int flag; 
    typedef struct Node{ 
        int orderid; 
        int stockid; 
        float price; 
        int quantity; 
        char type; 
        struct Node *next; 
    }NODE; 
     
    int Min(int a , int b) 
    { 
            return a<=b?a:b; 
    } 
     
    NODE *head1, *p, *head2;//head1 buy; head2 sell; 
     
    void InitBuyQueue(){ 
        head1 = (NODE*)malloc(sizeof(NODE)); 
        head1->orderid = -1; 
        head1->stockid = -1; 
        head1->price = -1.0; 
        head1->quantity = -1; 
        head1->type = 'x'; 
        head1->next = NULL; 
    } 
     
    void InitSellQueue(){ 
        head2 = (NODE*)malloc(sizeof(NODE)); 
        head2->orderid = -1; 
        head2->stockid = -1; 
        head2->price = -1.0; 
        head2->quantity = -1; 
        head2->type = 'x'; 
        head2->next = NULL; 
    } 
     
    void SaveBuy(NODE *p){ 
        NODE *q = head1, *q_pre; 
        int flag1 = 0; 
        while(q->next != NULL){ 
            q_pre = q; 
            q = q->next; 
            if(p->stockid == q->stockid){ 
                flag1 = 1; 
                while(q!=NULL && (q->price > p->price || q->price == p->price) && q->stockid == p->stockid){ 
                    q_pre = q; 
                    q = q->next; 
                } 
                q_pre->next = p; 
                p->next = q; 
                break; 
            } 
        } 
        if(flag1 == 0){ 
            p->next = head1->next; 
            head1->next = p; 
        } 
     
    } 
     
    void SaveSell(NODE *p){ 
        NODE *q = head2, *q_pre; 
        int flag1 = 0; 
        while(q->next != NULL){ 
            q_pre = q; 
            q = q->next; 
            if(p->stockid == q->stockid){ 
                flag1 = 1; 
                while(q!=NULL && (q->price < p->price || q->price == p->price) && q->stockid == p->stockid){ 
                    q_pre = q; 
                    q = q->next; 
                } 
                q_pre->next = p; 
                p->next = q; 
                break; 
            } 
        } 
        if(flag1 == 0){ 
            p->next = head2->next; 
            head2->next = p; 
        } 
    } 
     
    void DeleteBuy(NODE *p){ 
        NODE *x = head1; 
        while(x->next->orderid != p->orderid) 
            x = x->next; 
        x->next = p->next; 
         
    } 
     
    void DeleteSell(NODE *p){ 
        NODE *x = head2; 
        while(x->next->orderid != p->orderid) 
            x = x->next; 
        x->next = p->next; 
         
    } 
    void Delete(){ 
        NODE *x; 
        x = head1; 
        while(x->next != NULL){ 
            x = x->next; 
            if(x->quantity == 0) DeleteBuy(x); 
        } 
        x = head2; 
        while(x->next != NULL){ 
            x = x->next; 
            if(x->quantity == 0) DeleteSell(x); 
        } 
    } 
     
    int main(){ 
        int choice, stockid, quantity, orderid = 1; 
        float price; 
        char bs; 
        InitBuyQueue(); 
        InitSellQueue(); 
        while((scanf("%d ",&choice)) && choice != 0){ 
            if(choice == 0){ 
                exit(0); 
                break; 
            } 
            else if(choice == 1){ 
                //è¾“å…¥ 
                scanf("%d %f %d %c",&stockid,&price,&quantity,&bs); 
                getchar(); 
                p = (NODE*)malloc(sizeof(NODE)); 
                p->orderid = orderid++; 
                p->price = price; 
                p->stockid = stockid; 
                p->quantity = quantity; 
                p->type = bs; 
                printf("orderid: %04d\n",p->orderid); 
                if(bs == 'b'){ 
                    NODE *q = head2; 
                    while(q->next != NULL){ 
                        q = q->next; 
                        if(q->stockid != p->stockid) continue; 
                        else{ 
                            if(q->price < p->price || q->price == p->price){ 
                                int dealquantity = Min(p->quantity, q->quantity); 
                                printf("deal--price:%6.1f  quantity:%4d  buyorder:%04d  sellorder:%04d\n", (p->price + q->price)/2.0, dealquantity, p->orderid, q->orderid); 
                                p->quantity -= dealquantity; 
                                q->quantity -= dealquantity; 
                                if(q->quantity == 0) DeleteSell(q); 
                                if(p->quantity == 0) break;
                            } 
                            else continue; 
                        } 
                    } 
                    if(p->quantity == 0) 
                        free(p); 
                    else{ 
                        SaveBuy(p); 
                    } 
                } 
                else{ 
                    NODE *q = head1; 
                    while(q->next != NULL && p->quantity != 0){ 
                        q = q->next; 
                        if(q->stockid != p->stockid) continue; 
                        else{ 
                            if(q->price > p->price || q->price == p->price){ 
                                int dealquantity = Min(p->quantity, q->quantity); 
                                printf("deal--price:%6.1f  quantity:%4d  sellorder:%04d  buyorder:%04d\n", (p->price + q->price)/2.0, dealquantity, p->orderid, q->orderid); 
                                p->quantity -= dealquantity; 
                                q->quantity -= dealquantity; 
                                if(q->quantity == 0) DeleteBuy(q); 
                            } 
                            else continue; 
                        } 
                    } 
                    if(p->quantity == 0) 
                        free(p); 
                    else{ 
                        SaveSell(p); 
                    } 
                } 
                Delete(); 
            } 
            else if(choice == 2){ 
                int stockid1; 
                scanf("%d",&stockid1); 
                getchar(); 
                printf("buy orders:\n"); 
                p=head1; 
                while (p->next != NULL) 
                { 
                    p = p->next; 
                    if (p->stockid == stockid1 && p->quantity!=0) 
                    { 
                         
                        printf("orderid: %04d, stockid:%04d, price: %6.1f, quantity: %4d, b/s: %c\n",p->orderid,p->stockid,p->price,p->quantity,p->type); 
                    } 
                } 
                printf("sell orders:\n"); 
                p=head2; 
                while (p->next!=NULL) 
                { 
                    p = p->next; 
                    if (p->stockid == stockid1 && p->quantity!=0) 
                    { 
                         
                        printf("orderid: %04d, stockid:%04d, price: %6.1f, quantity: %4d, b/s: %c\n",p->orderid,p->stockid,p->price,p->quantity,p->type); 
                    } 
                } 
                 
            } 
            else if(choice == 3){ 
                int orderid1; 
                scanf("%d",&orderid1); 
                getchar(); 
                flag = 0; 
                p = head1; 
                while(p->next != NULL){ 
                    p = p->next; 
                    if(p->orderid == orderid1){ 
                        flag = 1; 
                        printf("deleted order:orderid: %04d, stockid:%04d, price: %6.1f, quantity: %4d, b/s: %c\n",p->orderid,p->stockid,p->price,p->quantity,p->type); 
                        DeleteBuy(p); 
                        break; 
                    } 
                } 
                p = head2; 
                while(p->next != NULL && !flag){ 
                    p = p->next; 
                    if(p->orderid == orderid1){ 
                        flag = 1; 
                        printf("deleted order:orderid: %04d, stockid:%04d, price: %6.1f, quantity: %4d, b/s: %c\n",p->orderid,p->stockid,p->price,p->quantity,p->type); 
                        DeleteSell(p); 
                        break; 
                    } 
                } 
                if(flag == 0){ 
                    printf("not found\n"); 
                } 
                flag = 0; 
            } 
        } 
    }