有如下程序:includeusing namespace std;class A{public:virtual void func1(){cout 有如下程序: #include<iostream> using namespace std; class A{ public: virtual void func1(){cout<<"A1";} void func2(){cout<<"A2";} }; class B:public A{ public: void func1(){cout<<"B1";} void func2(){cout<<"B2";} }; int main() { A *p=new B; p->func1(); p->func2(); return 0; } 执行该程序,屏幕上将显示输出( )。A.B1B2B.A1A2C.B1A2D.A1B2

有如下程序:includeusing namespace std;class A{public:virtual void func1(){cout<

有如下程序: #include<iostream> using namespace std; class A{ public: virtual void func1(){cout<<"A1";} void func2(){cout<<"A2";} }; class B:public A{ public: void func1(){cout<<"B1";} void func2(){cout<<"B2";} }; int main() { A *p=new B; p->func1(); p->func2(); return 0; } 执行该程序,屏幕上将显示输出( )。

A.B1B2

B.A1A2

C.B1A2

D.A1B2


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下面程序的结果是includeclass A{public:A( ){cout 下面程序的结果是 #include<iostream.h> class A { public: A( ) {cout<<"construtA"<<endl;} virtual~A( ) {cout<<"destructA"<<endl;}}; class B:public A {}; class C:public A {}; cA.constructA destructAB.constructA constructA destructA destructAC.constructA constructA constructA destructA destructA destructAD.constructA onstructA constructA constructA destructA destructA destructA destructA

有如下程序:includeincludeusing namespace std;class BASE{char c;public 有如下程序: #include<iostream>#include<iosream> using namespace std; class BASE{ char c; public; BASE(char n):c(n){} virtual ~ BASE(){cout<<c;} }; class DERIVED; public BASE{ char c; public: DERIVED (char n): BASE (n+1)A.XYB.YXC.XD.Y

有如下程序:include using namespace std;class AA{public: virtual void f() {cout 有如下程序: #include <iostream> using namespace std; class AA { public: virtual void f() { cout<< "AA"; } }; class BB : public AA { public: BB() { cout << "BB"; } }; claA.AAB.AABBCCC.BBAABBCCD.BBBBAACC

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有如下程序: include using namespaee std; class A{ public: A( ){cout 有如下程序:include<iostream>using namespaee std;class A{public:A( ){cout<<"A";}~A( ){cout<<"A";}};class B{A a;public:B( ){cout<<"B";}~B( )t cout<<"B";}};int main( ){B b;return 0;}程序的输出结果是______。

有如下程序:includeusing namespace std;class B{public:Virtual void show(){cout 有如下程序: #include<iostream> using namespace std; class B{ public: Virtual void show(){cout<<“B”;} }; class D:publicB{ public: void show(){cout<<“D”;} }; void funl(B*ptr){ptr->show();} void{un2(Bref){ref.show();} voidA.BBBB.BBDC.DBBD.DBD

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