feat: 统一 cpp 文件编码格式为 utf-8

practical_exercises/10_day_practice/day5/继承访问权限/保护成员.cpp

@@ -1,8 +1,8 @@
 /*
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>protected<EFBFBD>ij<EFBFBD>Ա
-<EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD><EFBFBD><EFBFBD>
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD>ߣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܷ<EFBFBD><EFBFBD><EFBFBD>
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD><EFBFBD><EFBFBD>
+基类中protected的成员
+类内部：可以访问
+类的使用者：不能访问
+类的派生类成员：可以访问
 */
 #include<iostream>
 class B
@@ -19,16 +19,16 @@ class D: public B
 public:
 	void f() 
 	{	
-        i=1;//cannot access <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>಻<EFBFBD>ɷ<EFBFBD><EFBFBD>ʻ<EFBFBD><EFBFBD><EFBFBD>˽<EFBFBD>г<EFBFBD>Ա
-		j=2;//<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD><EFBFBD>ʻ<EFBFBD><EFBFBD>ౣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա	
+        i=1;//cannot access 派生类不可访问基类私有成员
+		j=2;//派生类可以访问基类保护成员	
         k=3;	
     }
 };
 int main()
 {	
     B b; 
-	b.i=1;//cannot access ˽<EFBFBD>г<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD>߲<EFBFBD><EFBFBD>ܷ<EFBFBD><EFBFBD><EFBFBD>
-	b.j=2; //cannot access <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD>߲<EFBFBD><EFBFBD>ܷ<EFBFBD><EFBFBD><EFBFBD>
+	b.i=1;//cannot access 私有成员，类的使用者不能访问
+	b.j=2; //cannot access 保护成员，类的使用者不能访问
 	b.k=3;
     system("pause");
     return 0;

practical_exercises/10_day_practice/day5/继承访问权限/保护继承.cpp

@@ -1,7 +1,7 @@
 /*
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽΪprotected<EFBFBD>ļ̳г<EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ּ̳з<EFBFBD>ʽ<EFBFBD>£<EFBFBD>
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>public<EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>protected<EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>protected<EFBFBD><EFBFBD>private<EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>б<EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD><EFBFBD>ķ<EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD>
+派生方式为protected的继承称为保护继承，在这种继承方式下，
+基类的public成员在派生类中会变成protected成员，
+基类的protected和private成员在派生类中保持原来的访问权限
 */
 #include <iostream>
 using namespace std;
@@ -17,21 +17,21 @@ class Derived:protected Base{
     int y;
 public:
     void sety(int n){ y=n; }
-    void sety(){ y=getx();}   //<EFBFBD><EFBFBD><EFBFBD>ʻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա
+    void sety(){ y=getx();}   //访问基类的保护成员
     void showy(){ cout<<y<<endl; }
 };
 int main(){
     Derived obj;
-    obj.setx(10);    //<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+    obj.setx(10);    //错误
     obj.sety(20);
-    obj.showx();	 //<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 
+    obj.showx();	 //错误， 
     obj.showy(); 
     system("pause");   
 }
 
 /*
-<EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD>
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳лὫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>public<EFBFBD><EFBFBD>Ϊprotected<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>protected<EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>
-<EFBFBD>ⲿȥʹ<EFBFBD>ñ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>ʱ<EFBFBD>򣬻ᱨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>setx<EFBFBD><EFBFBD>showx<EFBFBD><EFBFBD><EFBFBD>ʴ<EFBFBD><EFBFBD>󣬶<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>࣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD>ӷ<EFBFBD><EFBFBD>ʻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD>
-<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD>y=getx()<29><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʣ<EFBFBD>
+解释：
+如最上面文字所示：保护继承会将基类的public变为protected，而对于protected成员，
+外部去使用保护成员的时候，会报错，所以setx与showx访问错误，而对于派生类，则可直接访问基类的保护成员，
+在派生类中，y=getx()可正常访问！
 */

practical_exercises/10_day_practice/day5/继承访问权限/公有继承.cpp

@@ -7,7 +7,7 @@ public:
 	int getx(){	return x;  }
 	void showx()	{	cout<<x<<endl;  }
 };
-//<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+//派生类
 class derived:public base{
 	int y;
 public:
@@ -16,7 +16,7 @@ public:
 	void showy()
 	{	cout<<y<<endl;   }
 };
-//<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>಻<EFBFBD><EFBFBD>ֱ<EFBFBD>ӷ<EFBFBD><EFBFBD>ʻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>private<EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĺ<EFBFBD><EFBFBD>г<EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+//派生类不可直接访问基类的private成员，可通过基类的共有成员函数访问
 int main()
 {	derived obj;
 	obj.setx(10);