有如下程序:include using namespace std;class Stack {public: Stack(unsigned n= 1

有如下程序: #include ＜iostream＞ using namespace std; class Stack { public: Stack(unsigned n= 10):size(n) {rep_=ew int[size]; top=0;} Stack(Stack& s):size(s.size) { rep_=new int[size]; for(int i=0;i＜size;i++) rep_[i]=s.rep_[i]; top=s.top; } ～Stack() {delete[]rep_;} void push(int a) {rep_[top]=a; top++;} int pop() {--top;return rep_[top];} bool isEmpty() const {return top==0;} private: int *rep_; unsigned size,top; }; int main() { Stack s1; for(int i= 1;i＜5 ;i++) s1. push(i); Stack s2(s1); for(i= 1 ;i<3;i++) cout＜＜s2.pop()＜＜','; s2.push(6); si.push(7); while(!s2.isEmpty()) cout＜＜s2.pop()＜＜','; return 0; }执行上面程序的输出是______ 。

A．4,3,2,1，

B．4,3,6,7,2,1，

C．4,3,6,2,1，

D．1，2，3，4，

[单选题]有如下程序:include using namespace std;class BASE{public:~BASE(){cout<<"BASE";}有如下程序： #include ＜iostream＞ using namespace std; class BASE{ public: ～BASE(){cout＜＜"BASE";} }; class DERIVED:public BASE{ public: ～DERIVED(){cout＜＜"DERIVED";} }; int main(

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[单选题]有如下程序;include using namespace std;class Base{public;Base(inti){x=i;}void d有如下程序; #include ＜iostream＞ using namespace std; class Base { public; Base(inti){x=i;} void dispa0{cout＜＜x＜＜',';} private; int x; }; class Derived;public Base { public; Derive

[单选题]有如下程序:include using namespace std;class A {public: A() {cout<<"A";}};class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 { Bb; public: C() {cout＜＜"C";

[单选题]有如下程序:include using namespace std;class x{protected: int a;public: x() { a有如下程序: #include ＜iostream＞ using namespace std; class x { protected: int a; public: x() { a=1; } }; class x1 : virtual public x { public: x1() { a+=1; cout＜＜a; } };A．1B．123C．24

[单选题]有如下程序:include using namespace std;Class x{protected: int a;public: x() {a=有如下程序： #include ＜iostream＞ using namespace std; Class x { protected: int a; public: x() { a=1; } }; class x1 : virtual public x { public: x1() { a+=1; cout＜＜A．1B．123C．242D．244

[单选题]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．AA

[单选题]有如下程序include using namespace std;class base{public:virtual void f1(){cout<有如下程序#include ＜iostream＞using namespace std;class base{public: virtual void f1() { cout＜＜"F1Base "; } virtual void f2() { cout＜＜"F2Base "; }};class derive: public base{ voi

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