若有以下程序:include using namespace std;class Base{private: inta,b;public: Bas

若有以下程序： #include ＜iostream＞ using namespace std; class Base { private: int a,b; public: Base(int x, int y) { a=x; b=y; } void disp () { cout＜＜a＜＜" "＜＜b＜＜end1; } }; class Derived : public Base { private: int c; int d; public: Derived(int x,int y, int z,int m) :Base(x,y) { c=z; d=m; } void disp () { cout＜＜c＜＜" "＜＜d＜＜end1; } }; int main() { Base b(5,5),*pb; Derived obj(1,2,3,4); pb=&obj; pb-＞disp(); return 0; } 执行程序后的输出结果是( )。

A．1,2

B．3,4

C．2,3

D．5,5

[单选题]若有以下程序:include using namespace std;class Base {public:Base() { x=0; } int若有以下程序： #include ＜iostream＞ using namespace std; class Base { public: Base() { x=0; } int x; }; class Derivedl: virtual public Base { public: Derivedl() { x=10; } }; class Deriv

[单选题]若有以下程序:include using namespace std;class A{private: int a;public: A(int i若有以下程序： #include ＜iostream＞ using namespace std; class A { private: int a; public: A(int i) { a=i; } void disp() { cout＜＜a＜＜", "; } }; class B { private: int b; public: B(int

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[单选题]若有以下程序:include using namespace std;class A{protected: int a;public: A() {若有以下程序： #include ＜iostream＞ using namespace std; class A { protected: int a; public: A() { a=10; } }; class A1 : public A { public: A1() { a=a+1; } }; class A2 : public A { publ

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[单选题]若有以下程序:include using namespace std;class A{private: int x;protected: int若有以下程序： #include ＜iostream＞ using namespace std; class A { private: int x; protected: int y; public: int z; void setx(int i) { x=i; } int getx () { return x; }; class B : protect

[单选题]若有以下程序:include using namespace std;class myClass{private: int var;public:若有以下程序： #include ＜iostream＞ using namespace std; class myClass { private: int var; public: myClass(int i) { var=i; } void add() { s+=var; } static int s; void display() { cout＜＜

[单选题]若有以下程序:include using namespace std;class Base{ int x;protected: int y;pub若有以下程序： #include ＜iostream＞ using namespace std; class Base { int x; protected: int y; public: int z; void setx(int i) { x=i; } int getx ( ) { return x; } }; class Inherit : pri

[单选题]若有以下程序:include using namespace std;class Base{private: int a,b;public: Ba若有以下程序： #include ＜iostream＞ using namespace std; class Base { private: int a,b; public: Base(int x, int y) { a=x; b=y; } void show() { cout＜＜a＜＜", "＜＜b＜＜end1; } }; class Deriv