下列程序的运行结果是______。
include<iostream.h>
class Base
{
public:
virtual void func(int i){cout<<"class Base:"<<i<<end1;)
};
class Derived: public Base
{
public:
void func(double d){cout<<"class Derived:"<<d<<endl;}
};
void main( )
{
Base a,*p=a;
Derived b;
p=&b;
(*p).func(3.3);
}
第1题:
下面程序的运行结果是
#include
class base
{
protected:
int a;
public:
base(){ cout <<”0”;}
class basel:virtual base
}
public:
base 1(){cout <<”1”;}
};
class base2:virtual base
{
public:
base2(){cout <<”2”;(
};
class derived:public base1,public base2
{
public:
derived(){cout <<”3”;}
};
void main()
{
derived obj;
cout <
}
A.0123
B.3120
C.0312
D.3012
第2题:
有如下程序: #include<iostream.h> using namespace std; Class Base { public: Base(){cout<<“BB”;f();} void{(){cout<<“BF”;} }; class Derived:public Base { public: Derived(){cout<<“DD”;} void f(){cout<<“Df”;) }; int main
A.BBBfDD
B.BBDfDDDf
C.DD
D.DDBBBf
第3题:
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;
}
第4题:
下列程序的运行结果是______。
include<iostream.h>
class Base
{
public:
void f(int x){cout<<“Base:”<<x<<endl;}
);
class Derived:public Base
{
public:
void f(char*str){cout<<“Derived:”<<str<<endl;}
};
void main(void)
{
Base*pd=ne
第5题:
下面程序的运行结果是( )。 #include<iostream.h> class base{ protected: int a; public: base(){cout<<“0”;} }; Class basel:Virtual base{ public: basel(){cout<<“1”;} }; Class base2:virtual base{ public: base2(){cout<<“2”;)
A.0123
B.3120
C.0312
D.3012
第6题:
下面程序的运行结果是
#include<iostream.h>
class base{
protected:
int a;
public:
base( ) {cout < < "0";}
};
class base l: virtual base{
public:
base l ( ) {cout < <"1";}
};
class base 2: virtual base{
public:
base2 ( ) {cout < <"2";}
};
class derived: public base 1, public base2{
public:
derived( ) {cout < < "3";}
};
void main( )
{
derive obj;
cout < < endl;
}
A.0123
B.3120
C.0312
D.3012
第7题:
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 func l(){ cout<<"B1"; }void func2(){ cout<<"B2"; }};int main() {A *p=new B;p->func1();p->func2();return 0;}运行此程序,屏幕上将显示输出( )。
A.B1B2
B.A1A2
C.B1A2
D.A1B2
第8题:
下列程序的输出结果是非曲直【 】。
include<iostream, h>
class base
{
int x, y;
public:
base(int i, int j){x=i; y=j;}
virtual int add(){return x+ y;}
};
class three: public base
{
int z;
public:
three(int i, int j, int k) :base(i, j){z=k; }
int add() { return (base:: add()+z); }
};
void main()
{
three * q=new three(lO,20,30);
cout<<q->add()<<end1;
}
第9题:
下列程序的运行结果是______。
include<iostream.h>
class A
{
public:
virtual void use( ) {cout<<"in A\n";}
};
class B:public A
{
public:
virtual void use( ) {cout<<"in B\n";}
};
class C:public B
{
public:
virtual void use( ){cout<<"in C\n";}
};
void main( )
{
A*obj;
bj=new C;
obj->use( );
delete obj;
}
第10题:
下面程序的输出结果是【 】。
include <iostream>
using namespace std;
class base
{
protected:
int a;
public:
base(){cout<<"0":}
};
class basel: virtual public base
{
public:
base1(){ cout<<"1";}
};
class base2 : virtual public base
{
public:
base2(){cout<<"2";}
};
class derived : public base1,public base2
{
public:
derived () {cout<<"3"; }
}
int main ()
{
derived obj;
cout<<end1;
return 0;
}