類的繼承會首先尋找基類，若基類未實現，則會尋找派生類的函數
1. class繼承，函數不繼承
#include <stdio.h> class Base{public: Base(){} ~Base(){} int a; void setA() { a = 1; }}; class A:public Base{public: A(){} ~A(){} void setA() { a = 2; } }; class B:public Base{public: B(){} ~B(){} void setA() { a = 3; }}; int main(){ A *ax = new A(); B *bx = new B(); Base *aClass = ax; Base *bClass = bx; aClass->setA(); bClass->setA(); printf("a value of a %d/n", aClass->a); printf("a value of b %d/n", bClass->a); return 0;}運行結果：
2. 函數和Class都繼承
#include <stdio.h> class Base{public: Base(){} ~Base(){} int a; virtual void setA() { a = 1; }}; class A:public Base{public: A(){} ~A(){} virtual void setA() { a = 2; } }; class B:public Base{public: B(){} ~B(){} virtual void setA() { a = 3; }}; int main(){ A *ax = new A(); B *bx = new B(); Base *aClass = ax; Base *bClass = bx; aClass->setA(); bClass->setA(); printf("a value of a %d/n", aClass->a); printf("a value of b %d/n", bClass->a); return 0;}運行結果：注意派生類中可以不寫virtual，最好寫上，以辨別是函數繼承
若將2中基類的函數寫為純虛函數，運行的結果一樣，但是如果基類是純虛函數，派生類必須實現相應的函數。
class Base{public: Base(){} ~Base(){} int a; virtual void setA()=0; };3. 類A中不有函數，則繼承自基類
class A:public Base{public: A(){} ~A(){} };結果為：
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