From be4a556f0ba1af0e83c75c24d9e8d2c1415f3bb6 Mon Sep 17 00:00:00 2001
From: flykhan <liubo666666@outlook.com>
Date: Thu, 27 Jul 2023 16:28:53 +0800
Subject: [PATCH] =?UTF-8?q?=E5=8F=8B=E5=85=83=E7=BB=83=E4=B9=A0:=20?=
 =?UTF-8?q?=E7=94=B5=E8=A7=86=E6=9C=BA=E5=92=8C=E9=81=A5=E6=8E=A7=E5=99=A8?=
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---
 day4/d7.cpp | 183 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 day4/d7.cpp

diff --git a/day4/d7.cpp b/day4/d7.cpp
new file mode 100644
index 0000000..4c5c199
--- /dev/null
+++ b/day4/d7.cpp
@@ -0,0 +1,183 @@
+#include <iostream>
+#include <cstring>
+#include <cstdlib>
+
+using namespace std;
+
+// 声明遥控器类
+class Remote;
+
+// 定义电视类
+class Television
+{
+    friend class Remote;
+
+public:
+    enum
+    {
+        On, // 电视开关状态
+        Off
+    };
+    enum
+    {
+        minVol,
+        maxVol = 100 // 音量从 0 到 100
+    };
+    enum
+    {
+        minChannel = 1,
+        maxChannel = 255 // 频道范围 1 到 255
+    };
+
+    Television()
+    {
+        mStatus = Off;         // 状态
+        mVolume = minVol;      // 声音
+        mChannel = minChannel; // 频道
+    }
+
+public:
+    void power() // 开关机
+    {
+        this->mStatus = (this->mStatus == On ? Off : On);
+    }
+
+    void VolumeUp() // 调高音量
+    {
+        if (this->mVolume >= maxVol)
+            return;
+        this->mVolume++;
+    }
+
+    void VolumeDown() // 调低音量
+    {
+        if (this->mVolume <= minVol)
+            return;
+        this->mVolume--;
+    }
+
+    void ChannelUp() // 向上更换电视频道
+    {
+        if (this->mChannel >= maxChannel)
+            return;
+        this->mChannel++;
+    }
+
+    void ChannelDown() // 向下更换电视频道
+    {
+        if (this->mChannel <= minChannel)
+            return;
+        this->mChannel--;
+    }
+
+    void ShowTeleState() // 展示当前电视状态信息
+    {
+        cout << "开机状态: " << (mStatus == On ? "已开机" : "已关机") << endl;
+        if (mStatus == On)
+        {
+            cout << "当前音量: " << mVolume << endl;
+            cout << "当前频道: " << mChannel << endl;
+        }
+        cout << "----------------------" << endl;
+    }
+
+private:
+    int mStatus;  // 电视状态
+    int mVolume;  // 声音
+    int mChannel; // 频道
+};
+
+// 定义遥控器
+class Remote
+{
+public:
+    Remote(Television *tv) // 构造函数
+    {
+        pTV = tv;
+    }
+
+public:
+    void power() // 开关机
+    {
+        pTV->power();
+    }
+
+    void VolumeUp() // 调高音量
+    {
+        pTV->VolumeUp();
+    }
+
+    void VolumeDown() // 调低音量
+    {
+        pTV->VolumeDown();
+    }
+
+    void ChannelUp() // 向上更换电视频道
+    {
+        pTV->ChannelUp();
+    }
+
+    void ChannelDown() // 向下更换电视频道
+    {
+        pTV->ChannelDown();
+    }
+
+    // 设置频道，遥控器新增功能
+    void SetChannel(int channel)
+    {
+        if (channel < Television::minChannel || channel > Television::maxChannel)
+            return;
+        pTV->mChannel = channel;
+    }
+
+    void ShowTeleState() // 展示当前电视状态信息
+    {
+        pTV->ShowTeleState();
+    }
+
+private:
+    Television *pTV;
+};
+
+// 直接操作电视
+void test01()
+{
+    Television tv;
+    tv.ShowTeleState();
+    tv.power();    // 开机
+    tv.VolumeUp(); // 音量 +1
+    tv.VolumeUp();
+    tv.VolumeUp();
+    tv.VolumeUp();
+    tv.ChannelUp(); // 频道 +1
+    tv.ChannelUp();
+    tv.ShowTeleState();
+}
+
+// 通过遥控器操作电视
+void test02()
+{
+    // 创建电视
+    Television tv;
+
+    // 创建遥控器
+    Remote rmt(&tv);
+
+    rmt.ShowTeleState();
+    rmt.power();    // 开机
+    rmt.VolumeUp(); // 音量 +1
+    rmt.VolumeUp();
+    rmt.VolumeUp();
+    rmt.VolumeUp();
+    rmt.ChannelUp(); // 频道 +1
+    rmt.ChannelUp();
+    rmt.SetChannel(100);
+    rmt.ShowTeleState();
+}
+
+int main()
+{
+    // test01();
+    test02();
+    return 0;
+}