#define NULL 0
typedef struct food
{
    char name[20];
    int id;
    int price;
    int sum;
    struct food *next;
}node,*list;

struct book
{
    char name[20];
    int price;
};


list creatlist(list l)
{
    l = (list)malloc(sizeof(node));
    if(!l)
    {
        printf("malloc fail\n");
    }
    memset(l->name,0,sizeof(20));
    l->next = NULL;
    l->id = 0;
    l->price = 0;
    l->sum = 0;
    return l;
}



struct book ccc[3] = {{"qingjiaorousi",12},{"sijidourousi",11},{"yuxiangqiezi",15}};

char* serchname(int id)
{
    char a[20] = {0};
    strcpy(a,ccc[id].name);
    return a;
}
int serchprice(int id)
{
    int price;
    price = ccc[id].price;
    return price;
}



list addlist(list l, int id, int num)
{
    list p,q,pbefore;
    p = l;

    printf("##%d ,p = %p\n",__LINE__,p);
    while(p)
    {
        if(p->id != id)
        {
            printf("##%d\n",__LINE__);
            pbefore = p;
            p = p->next;
        }
    }
    printf("##%d\n",__LINE__);

    while(num)
    {

        printf("##%d,num = %d\n",__LINE__,num);
        q = (list)malloc(sizeof(node));

        q->id = id;
        printf("q->id = %d\n",q->id);
        strcpy(q->name,serchname(id));
        printf("##%s\n",q->name);
        q->price = serchprice(id);
        printf("##%d\n",__LINE__);
        l->sum += q->price;
        printf("##%d,%p\n",__LINE__,p);
        q->next = p;
        printf("##%d,%p,q addr = %p\n",__LINE__,p,q);
        pbefore->next = q;
        p = q;
        printf("##%d\n",__LINE__);

        printf("##%d\n",__LINE__);
        num--;

        printf("##%d\n",__LINE__);
        //free(q);

        printf("-------------------%d\n",__LINE__);
    }

    p = l->next;

    while(p)
    {
        printf("id  foodname  price\n");
        printf("%d  %s        %d\n",p->id,p->name,p->price);
        p = p->next;
    }
    return l;

}

void printfoodstatus(list l)
{
    list p;
    p = (list)malloc(sizeof(node));
    p = l->next;
    if(!p)
    {
        printf("food line is empty\n");
        return -1;
    }
    while(p)
    {
        printf("id  foodname  price\n");
        printf("%d  %s    %d\n",p->id,p->name,p->price);
        p = p->next;
    }
    printf("total price is %d\n",l->sum);
}

list dellist(list l,int id,int num)
{
    list p,pbefore,pnext;
    int flag = 0;
    int numtime;
    p = l;
    while(p)
    {
        if(p->id != id)
        {
            pbefore = p;
            p = p->next;
        }
        else
        {
            flag = 1;
            break;
        }
    }

    if(flag == 0)
    {
        printf("the id don't exist\n");
        return -1;
    }
    numtime = num;
    while(num)
    {
        if(p->id != id)
        {
            printf("only have %d\n",numtime-num);
        }
        pbefore->next = p->next;
        pnext = p->next;
        free(p);
        p = pnext;
        num--;
    }

}

int main()
{
    list l;
    int id;
    int num;
    int cmd;
    while(1)
    {
        printf("please input your cmd\n");
        printf("0:creat;1:add;2:del;3:print\n");
        scanf("%d",&cmd);
        switch(cmd)
        {
            case 0:
                l = creatlist(l);
            break;
            case 1:
                printf("input the id and num you want to add\n");
                scanf("%d%d",&id,&num);
                addlist(l,id,num);
            break;
            case 2:
                printf("input the id and num you want to del\n");
                scanf("%d%d",&id,&num);
                dellist(l,id,num);
            break;
            case 3:
                printfoodstatus(l);
            break;
            default:
                printf("cmd err\n");
        }

    }
}