<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[L_WH_的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/L_WH_</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; L_WH_]]></copyright><item><title><![CDATA[对COM组件的调用返回了错误HRESULT E_FAIL]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/146106898</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/146106898</guid><author>L_WH_</author><pubDate>Fri, 07 Mar 2025 23:46:37 +0800</pubDate><description><![CDATA[对COM组件的调用返回了错误HRESULT E_FAIL。]]></description><category></category></item><item><title><![CDATA[关键字：volatile | const | static]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/145801448</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/145801448</guid><author>L_WH_</author><pubDate>Sat, 22 Feb 2025 23:22:15 +0800</pubDate><description><![CDATA[关键字核心作用典型场景volatile禁止编译器优化，确保内存直接访问硬件寄存器、多线程共享变量const定义不可修改的常量或参数保护数据、接口约束static控制生命周期、作用域或共享性局部持久化、类静态成员、文件封装。]]></description><category></category></item><item><title><![CDATA[C++之虚函数]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/145786574</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/145786574</guid><author>L_WH_</author><pubDate>Sat, 22 Feb 2025 14:02:42 +0800</pubDate><description><![CDATA[因为如果基类析构函数不是虚函数，那么删除基类指针指向的派生类对象时，行为是未定义的，通常只会调用基类的析构函数，导致派生类的资源未被释放，内存泄漏。，所以，如果基类虚函数有默认参数，派生类重写时即使改变了默认参数，当通过基类指针调用时，使用的还是基类的默认参数，这样可能会导致意料之外的结果。，即创建派生类对象时，将调用派生类的构造函数，而不是基类的构造函数，派生类不继承基类的构造函数，所以将类构造函数声明为虚无任何意义。时，会先调用Derived的析构函数，再调用Base的析构函数，正确释放资源。]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（15）——统计示例]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128729983</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128729983</guid><author>L_WH_</author><pubDate>Mon, 30 Jan 2023 15:13:53 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（14）——数据接口]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128704695</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128704695</guid><author>L_WH_</author><pubDate>Wed, 18 Jan 2023 19:45:52 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（13）——图表]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128659979</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128659979</guid><author>L_WH_</author><pubDate>Sat, 14 Jan 2023 21:46:39 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（12）——数据帧]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128656505</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128656505</guid><author>L_WH_</author><pubDate>Thu, 12 Jan 2023 14:45:23 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（11）——因子]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128651703</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128651703</guid><author>L_WH_</author><pubDate>Thu, 12 Jan 2023 11:28:59 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（10）——数组]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128651143</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128651143</guid><author>L_WH_</author><pubDate>Wed, 11 Jan 2023 22:00:06 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（9）——矩阵]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128637436</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128637436</guid><author>L_WH_</author><pubDate>Tue, 10 Jan 2023 22:49:03 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（8）——列表]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128620427</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128620427</guid><author>L_WH_</author><pubDate>Tue, 10 Jan 2023 22:22:40 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（7）——向量]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128606108</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128606108</guid><author>L_WH_</author><pubDate>Sun, 08 Jan 2023 22:01:14 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（6）——字符串]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128603311</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128603311</guid><author>L_WH_</author><pubDate>Sun, 08 Jan 2023 21:35:33 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（5）——数据重塑]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128543717</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128543717</guid><author>L_WH_</author><pubDate>Wed, 04 Jan 2023 12:47:45 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（4）——包]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128507025</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128507025</guid><author>L_WH_</author><pubDate>Sat, 31 Dec 2022 17:48:15 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（3）——运算符与决策]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128506620</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128506620</guid><author>L_WH_</author><pubDate>Sat, 31 Dec 2022 17:11:39 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（2）——变量]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128506244</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128506244</guid><author>L_WH_</author><pubDate>Sat, 31 Dec 2022 16:32:46 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[R语言学习笔记（1）——数据类型]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/128503654</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/128503654</guid><author>L_WH_</author><pubDate>Sat, 31 Dec 2022 16:00:41 +0800</pubDate><description><![CDATA[R语言学习笔记]]></description><category></category></item><item><title><![CDATA[消除类游戏]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/103739276</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/103739276</guid><author>L_WH_</author><pubDate>Fri, 27 Dec 2019 22:28:23 +0800</pubDate><description><![CDATA[【问题描述】消除类游戏是深受大众欢迎的一种游戏，游戏在一个包含有n行m列的游戏棋盘上进行，棋盘的每一行每一列的方格上放着一个有颜色的棋子，当一行或一列上有连续三个或更多的相同颜色的棋子时，这些棋子都被消除。当有多处可以被消除时，这些地方的棋子将同时被消除。
现在给你一个n行m列的棋盘，棋盘中的每一个方格上有一个棋子，请给出经过一次消除后的棋盘。
请注意：一个棋子可能在某一行和某一列同时被消除。
【...]]></description><category></category></item><item><title><![CDATA[类的设计和实现II---自定义图形层次体系]]></title><link>https://blog.youkuaiyun.com/L_WH_/article/details/103724369</link><guid>https://blog.youkuaiyun.com/L_WH_/article/details/103724369</guid><author>L_WH_</author><pubDate>Thu, 26 Dec 2019 23:53:02 +0800</pubDate><description><![CDATA[【问题描述】
编写一个程序，定义抽象基类Shape，由它派生出3个派生类：Circle（圆形），Square（正方形），Rectangle（矩形）。Square正方形派生出了cube正方体。
用虚函数分别计算几种图形面积或体积，并求用基类指针数组，使它每一个元素指向一个派生类对象。
#include &lt;iostream&gt;
using namespace std;
class Shape...]]></description><category></category></item></channel></rss>