每天打卡一小时 第二十七天

Posted 2023-05-14 youxiandechilun

#include <iostream>

using namespace std;

int main()

  int stones = 20; // 石头总数
  int max_stones = 3; // 每次最多取石头的数量
  int n = 1; // 当前轮到的玩家编号
  int take; // 此次取走的石头数量
  
  while (stones > 0) 
    cout << "现在有 " << stones << " 块石头。" << endl;
    cout << "玩家 " << n << ", 请取走 1 到 " << max_stones << " 块石头：";
    cin >> take;
    
    // 检查取走的数量是否在合法范围内
    while (take <= 0 || take > max_stones || take > stones) 
      cout << "无效的数字，请重新输入：";
      cin >> take;
    
    
    // 取走石头
    stones -= take;
    
    // 轮到下一个玩家
    n = (n == 1) ? 2 : 1;
  
  
  // 游戏结束，输出胜者
  cout << "恭喜玩家 " << n << " 获胜！" << endl;
  
  return 0;

　　

Mysql基础第二十七天,使用游标

游标

使用游标

call pressorders(); // 使用游标

创建游标

create procedure precessorders()
begin 
  declare done boolean default 0;
  declare t decimala(10,2);
  declare o int;
  declare ordernumbers cursor for select order_num from orders;
  declare continue bandler for sqlsate='0200' set done=1;
  create table if not exists ordertotals(order_num int,total decimal(10,2)
  open ordernumbers;
  repeat
    fetch ordernumbers into o;
    call ordertotal(o,1,t)
    insert into ordertotals values (o,t)
  until done end repeat;
  close ordernumbers;
  select * from ordertotals;
end;

打开和关闭游标

open ordernumbers; //打开
  repeat
    fetch ordernumbers into o;
    call ordertotal(o,1,t)
    insert into ordertotals values (o,t)
  until done end repeat;
  close ordernumbers; //关闭

删除游标

deallocate ordernumbers; // 删除游标