實驗四 繼承

task2.cpp

#include #include 

//definitation of graph
class
graph
};//
definition of rectangle, derived from graph
class rectangle : public
graph
}; 
//definition of circle, derived from graph
class circle : public
graph
}; 
//definitaion of fun(): as a call inte***ce
void fun(graph*ptr)
//test
intmain()

歸納總結：

同名覆蓋原則：當呼叫派生類內與基類同名的函式時，預設呼叫派生類內的函式。

二元作用域分辨符：派生類名.基類::函式名，此時呼叫的是作用域標定的類內函式。

型別相容原則：當派生類與基類為public派生時，可以互相呼叫彼此類內的函式及資料。

virtual後：

graph::draw()變為虛基類，指標指向不再由指標型別決定，而是指向定義時的定義型別。於是r1指向的是rectangle類，呼叫draw()時預設呼叫rectangle::draw()；c1同理。

task3:

battery.hpp:

#include#include

using
namespace
std;
class
battery 
int get_capacity() 
};

#include#include

using
namespace
std;
class
car 
void
info()
void update_odometers(int
new_odometers)
};

#include"

battery.hpp
"#include
"car.hpp
"class electriccar :public
car 
void
info()
};

#include"

electriccar.hpp
"int
main()

結果截圖：

實驗四 繼承

簡單說明 基於虛基類的一些特性進行的驗證性實驗，理解並掌握虛基類的使用特點與注意事項。源 如下 關於虛基類已修改 include include definitation of graph class graph definition of rectangle,derived from graph ...

實驗四 繼承

任務二 1 cpp include include definitation of graph class graph definition of rectangle,derived from graph class rectangle public graph definition of circ...

實驗四 繼承

task2.cpp include include definitation of graph class graph definition of rectangle,derived from graph class rectangle public graph definition of circ...