[说明]
下面代码实现class C对class A和B的protected成员和public成员的调用。仔细阅读[代码5-1]、[代码5-2]，在 (n) 处写出正确的运行结果。
[代码5-1]
#include ＜iostream.h＞
class A
private:
int a1;
protected:
int a2;
public:
A ( int v1,int v2,int v3 ): a1 ( v1 ) ,a2 ( v2 ) ,a3 ( v3 )
int a3
;
class B : pubiic A
private:
int b1;
protected:
int b2;
public:
B ( int v1,int v2,int v3,int v4,int v5,int v6 )
: A(v1,v2,v3),b1 (v4),b2(v5),b3 (v6)
int b3;
;
class C : public B
private:
int c1;
protected:
int c2;
public:
int c3;
C (int v1,int v2,int v3,int v4,int v5,int v6,int v7,int v8,int v9 )
: B ( v1,v2,v3,v4,v5,v6 ) ,c1 ( v7 ),c2 ( v8 ) ,c3 v9
void disp ( )
cout ＜＜ "a2 in class C =" ＜＜ a2 ＜＜ endl;
cout ＜＜ "a3 in class C =" ＜＜ a3 ＜＜ eudl;
cout ＜＜ "b2 in class C =" ＜＜ b2 ＜＜ endl;
tout ＜＜ "b3 in class C =" ＜＜ b3 ＜＜ endl;
；
[代码5-2]
voidmain()
Cdemo(10,20,30,40,50,60,70,80,90)；
cout＜＜"对象demo.a3="＜＜demo.a3< cout＜＜"对象demo.b3="＜＜demo.b3< cout＜＜"对象demo.c3="＜＜demo.c3< demo.disp( )；
[运行结果]
对象demo.a3＝ (1)
对象demo.b3＝ (2)
对象demo.c3＝ (3)
a2 in class C＝ (4)
a3 in class C＝ (5)
b2 in class C＝ (6)
b2 in class C＝ (7)
