有如下程序:includeusing namespace std;class A{public:A(){cout 有如下程序： #include＜iostream＞ using namespace std; class A { public: A(){cout＜＜"A";} }; class B{public:B(){cout＜＜"B";} }; class C:public A { B b; public:C(){cout＜＜"C";} }; int main() { C obj; return 0; } 执行后的输出结果是( )。A．CBAB． BACC．ACBD．ABC
有如下程序:includeusing namespace std;class A{public:A(){cout<<"A";}};class B{p
有如下程序： #include＜iostream＞ using namespace std; class A { public: A(){cout＜＜"A";} }; class B{public:B(){cout＜＜"B";} }; class C:public A { B b; public:C(){cout＜＜"C";} }; int main() { C obj; return 0; } 执行后的输出结果是( )。
A．CBA
B． BAC
C．ACB
D．ABC
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有如下程序: include using namespaee std; class ONE{ public: virtual void f 有如下程序：include ＜iostream＞using namespaee std；class ONE{public：virtual void f( ){cout＜＜"1"；}}；class TWO：public ONE{public：TWO( )1 cout＜＜"2"；}{；class THREE：public TWO{public：virtual void f( )}TWO::f( )；cout＜＜"3"；}}；int main( ){ONE aa，*P；TWO bb；THREE cc；P=cc；p-＞f( )；return 0；}程序的输出结果是______。
以下程序的执行结果是【】。 include using namespace std; class base { public: virmal 以下程序的执行结果是【 】。include＜iostream＞using namespace std；class base{public：virmal void who(){cout＜＜"Base Class"＜＜endl；)}；class Derivedl:public Base{public：virtual void who(){cout＜＜"Derivedl Class"＜＜endl;}}；class derived2:public Base{public：virtual void who(){cout＜＜"Derived2 Class"＜＜endl；)}；int main(int argc，char*argv[]){base obj1，*P；deliVedl obj2；derived2 obj3；p=obj1； p-＞who()；p=obj2； p-＞who()；p=obj3； p-＞who()；return 0；}
有如下程序: include using namespace std; class A { public: virtual void f(){cout 有如下程序：include＜iostream＞using namespace std;class A{public:virtual void f(){cout＜＜"1";}};class B:public A{public:B (){cout＜＜"2";}};class C:public B{public:virtual void f(){B::f();cout＜＜"3";}};int main(){A aa,*p;B bb;C cc;p=cc;p-＞f();return 0;}执行上面程序的输出是______。
有如下程序: include using namespace std; class ONE { public: virtual void f() { 有如下程序：include ＜iostream＞using namespace std;class ONE{public:virtual void f() { cout ＜＜ "1"; }};class TWO: public ONE{public:TWO() { cout ＜＜ "2"; }};class THREE: public TWO{public:virtual void f() {TWO::f(); cout ＜＜ "3"; }};int main(){ONE aa, *p;TWO bb;THREE cc;p=cc;P-＞f();return 0;}执行上面程序的输出是【 】。
请将下列程序的横线处补充完整,使得输出结果为bbaaincludeusing namespace std;class 请将下列程序的横线处补充完整，使得输出结果为bbaainclude＜iostream＞using namespace std;class A{public:______{cout＜＜"aa";}};class B:public A{public:～B(){cout＜＜"bb";}};int main(){B*p=new
有如下程序: include using namespace std; class PARENT { public: PARENT() { cout 有如下程序：include ＜iostream＞using namespace std;class PARENT{public:PARENT() { cout ＜＜"PARENT"; }};class SON : public PARENT{public:SON() {cout ＜＜ "SON"; }};int main(){SON son;PARENT *p;p = son;return 0;}执行上面程序的输出是______。
以下程序的执行结果是______。 include class base { public: virtual void who(){c 以下程序的执行结果是______。include＜iostream.h＞class base{public：virtual void who(){cout＜＜"base class"＜＜endl：}}；class derrvel:public base{public：void who(){cout＜＜"derivel class"＜＜endl：}};class derive2；public base{public：void who() {cout＜＜"derive2 class"＜＜endl；}}；void main(){base obj1，*P；derive1 obj2；derive2 obj3：p=obj1；p-＞who()；p=obj2：p-＞who()；p=obj3；p-＞who()；}
请将如下程序补充完整,使得输出结果为:bbaa。 include using naluespace std; class 请将如下程序补充完整，使得输出结果为：bbaa。include＜iostream＞using naluespace std；class A{public：______{eout＜＜"aa"；}}；class B：public A{public：～B( ){eont＜＜"bb"；}}；int ulain( ){B*P=new B；delete P；return 0；}
有以下程序:include using namespace std;class Base{public:Base(){}virtual void w 有以下程序： #include ＜iostream＞ using namespace std; class Base { public: Base(){} virtual void who() { cout＜＜"Base Class"＜＜end1; } ～Base(){} }; class Derivel : public Base { public: void who() { cout＜＜"Derivel Class"＜＜end1; } }; class Derive2 : public Base { public: void who () { cout＜＜"Derive2 Class"＜＜end1; } }; int main () { Base *p; Derivel obj1; Derive2 obj2; p=obj1; p=obj2; p-＞who ( ); return 0; } 执行程序后的输出结果是( )。A．Base ClassB．Derivel ClassC．Derive2 ClassD．程序编译时出错
下面程序的结果是 ______。includeclass A{ public:virtual voidfun()=0{};};class 下面程序的结果是 ______。 #include＜iostream.h＞ class A{ public: virtual void fun()=0{}; }; class B:public A{ public: void fun () {cout＜＜ "new file" ;} }; class C: public A{ public: void fun (){cout＜＜"open file"＜＜ " " } }; class D: public A{ public: void fun () {cout＜＜ "save file\n" ;} }; void main() { A a,*p; B b; C c; D d; p=c; p-＞fun (); p=b; p-＞fun (); p=d; p-＞fun(); }A．new file open file save fileB．new file new file new fileC．编译出错D．open file new file save file