有如下程序: #include<iostream> using namespaee std; class VAC{ public: int f( )COUSt{return 3;} int f( ){return 5;} }; int main( ){ VAC vl; const VAC v2; eout<<v1.f( )<<v2.f( ); return 0; } 程序的输出结果是
A.53
B.35
C.55
D.33
第1题:
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______。
第2题:
有如下程序: #include<iostream> using namespace std; class GA{ public: virtual int f( ){return 1;} }; class GB:public GA{ public: virtual int f( ){return 2;} }; void show(GA g){eout<<g.f( );} void display(GA&g){cout<<g.f( );} int main( ){ GA a;show(A) ;display(A) ; GB b;show(B) ;display(B) ; return 0; } 程序的输出结果是
A.1111
B.1211
C.1112
D.1212
第3题:
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______。
第4题:
有如下程序: #include<iostream> using namespace std; class TlestClass { int n; public: TestClass(int k):n(k){} int get(){return n;} int get()const{return n+1;} }; int main() { TestClass p(5); colast TestClass q(6); cout<<p.get()<<q.get(); return 0; } 执行后的输出结果是( )。
A.55
B.57
C.75
D.77
第5题:
有如下程序: #include<iostream> using namespace std; class A{ public: static int a; void init(){a=1;} A(int a=2){init(); a++;} }; int A::a=0; A obj; int main() { cout<<obj.a; return 0; 运行时输出的结果是( )。
A.0
B.1
C.2
D.3
第6题:
有如下程序: #include<iostream> using namespace std; class Base{ int x; public: Base(int n=0):x(n){cout<<n;} int getX( )const{return x;} }; class Derived:public Base{ int y; public: Derived(int m,int n):y(m),Base(n){tout<<m;} Derived(int m):y(m){cout<<m;} }; int main( ){ Derived dl(3),d2(5,7); return 0; } 程序的输出结果是
A.375
B.357
C.0375
D.0357
第7题:
有如下程序: #include<iostream> using namespace std; class XX { protected: int k; public: XX(int n=5):k(n){}; ~XX() { cout<<"XX": } virtual void f()const=0; }; inline void XX::f()const { cout<<k+3; }; class YY:public XX { public: ~YY() { cout<<”YY”; } void f()const { cout<<k-3; XX::f(); } }; int main() { XX &p=*new YY; P.f(); delete &p; return 0: } 执行上面的程序将输出( )。
A.28XX
B.28YYXX
C.33XX
D.33XXYY
第8题:
有如下程序:
include<iostream>
using namespaee std;c lass Animal{
public:
virtual char*getType( )const{return"Animal";}
virtual char*getVoice( )const{return"Voice";}
};
class Dog:public Animal{
public:
char*getType( )const{return"Dog";}
char*getVoice( )eonst{return"Woof";}
};
void type(Animal&A) {cout<<a.getType( );}
void speak(Animal A) {eout<<a.getVoice( );}
int main( ){
Dog d;type(D) ;cout<<"speak";speak(D) ;cout< return 0;
}
程序的输出结果是______。
第9题:
有如下程序: #include<iostream> using namespace std; class TestClass{ static int i; public: TestClass(){i++;} ~TestClass(){i--;} static int getVal(){return i;} }; int TestClass::i=0; void f(){TestClass obj2;cout<<obj2.getVal();} int main(){ TestClass obj 1; f(); TestClass *obj3=new TestClass;cout<<obj3->getVal(); delete obj3;cout<<TestClass::getVal(); return 0; } 程序的输出结果是( )。
A.232
B.221
C.222
D.231
第10题:
如下程序的输出是 #include<iostream> using namespace std; class Base{ public: Base( ){cout<<"BB";f( );} void f( ){cout<<"Bf";} }; class Derived:public Base{ public: Derived( ){eout<<"DD";} void f( ){cout<<"Df";} }; int main( ){Derived d;return 0;}
A.BBBff)D
B.BBDfDDDf
C.DD
D.DDBBBf