下列类的定义中,有( )处语法错误。 class Base { publiC: Base(){} Base(int i) { data=i; } ptivate: int data; }; class DeriVe:public Base { public: Derive():Base(0){} Derive(int x) { d=x; } void setvalue(int i) { data=i; } private: d; };
A.1
B.2
C.3
D.4
第1题:
下列类的定义中,有( ) 处语法错误。 class Base { public: Base(){} Base(int i) { data=i; } private: int data; }; class Derive: public Base { public: Derive(): Base(O) { } Derive(int x) { d=x; } void setvalue(int i) { data=i; } private: d; };
A.1
B.2
C.3
D.4
第2题:
在下面的程序的横线处填上适当的语句,使该程序的输出为12。
include 〈iostream〉
using namespace std;
class Base
{
public:
int a;
Base(int i) { a=i;}
};
class Derived : public Base
{
int a;
public:
Derived(int x) : Base(x),b(x+1) {}
void show()
{
【 】; //输出基类数据成员a的值
cout〈〈b〈〈end1;
}
};
int main()
{
Derived d(1);
d.show();
return 0;
}
第3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4题:
下列程序的输出结果是【 】。
include<iostream>
using namespace std;
class Base{
int x;
public:
Base(int b):x(b){}
virtual void display(){cout<<x;}
};
class Derired:public Base{
int y;
public:
Derived(int d):Base(d),y(d){}
void display(){cout<<y;}
};
int main(){
Base b(1);Derived d(2);
Base*p=&d;
b.display();d.display();p->display();
return 0;
}
第5题:
下列程序的输出结果是【 】。
include<iostream>
using namespace std;
class Base{
public:
int m,n;
Base(int i,int j):m(i),n(j){}
};
class Derived:public Base{
public:
int m,k,;
Derived(int i,int j):Base(i,j),m(i+1),k(j+1){}
};
int main(){
Derived d(1,5);
cout<<d.m<<d.k<<d.n;
return 0;
}
第6题:
A.private void fun( int n ){ //...}
B.void fun ( int n ){ //... }
C.protected void fun ( int n ) { //... }
D.public void fun ( int n ) { //... }
第7题:
为完成下面的程序,应在划线处填入的语句是 #include<iostream> using namespace std; class Base { private: int x; public: Base (int i) { x=i; } ~Base(){} }; class Derived:public Base { public: ______________//完成类Derive构造函数的定义 }; int main() { Derived Obj; return 0; }
A.Derived(int i):Base(i){}
B.Derived(){}
C.void Derived (int i):Base(i){}
D.Derived(int i){Base(i);}
第8题:
在下面的程序的横线处填上适当的语句,使该程序的输出为12。
include<iostream.h>
using namespace std;
class Base
{
public:
int a,b;
Base(int i){a=i;}
};
class Derived:public Base
{
int a;
public:
Derived(int x):Base(x),b(x+1){};
void show()
{
______;//输出基类数据成员a的值
cout<<b<<endl;
}
};
int main()
{
Derived d(1);
d.show();
return 0;
第9题:
有以下程序:
include<iostream>
using namespace std;
class Base
{
public:
Base()
{
K=0;
}
int x;
};
class Derivedl:virtual public Base
{
public:
Derivedl()
{
x=10;
}
};
class Derived2:virtua1 public Base
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;
}