下面程序的输出结果是( )。 public class Sun { public static void main(String args[ ]) { int n=4 ,sum=0; while (n>0) { sum+=n; n--; } System.out.println("sum is "+sum); } }
A.sum is 10
B.sum is 4
C.10
D.4
第1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;
}
第2题:
下面程序的输出结果是( )。 #include <iostream> using namespace std; class A { public: A( ) {cout<<"A";} } class B { public: B() {coat<<"B" ;} } class C: public A { public: B b; C() {cout<<"C";} } void mian(){ C c; }
A.CBA
B.ABC
C.ACB
D.BCA
第3题:
第4题:
请写出下面的输出:
class B
{
public:
virtual void Print(void)
{
printf(“B::Print\n”);
}
virtual void Reprint(void)
{
printf(“B:Reprint\n”);
}
void Algo(void)
{
Print();
Reprint();
}
};
class D : public B
{
public:
virtual void Print(void)
{
printf(“D::Print\n”);
}
};
void main()
{
B *p = new D();
p->Print();
p->Algo();
}
第5题:
下面程序的结果是 ______。 #include<iostream.h> class A{ public: virtual void fun()=0{}; }; class B:public A{ public: void fun () {cout<< "new file" ;} }; class C: public A{ public: void fun (){cout<<"open file"<< " " } }; class D: public A{ public: void fun () {cout<< "save file\n" ;} }; void main() { A a,*p; B b; C c; D d; p=&c; p->fun (); p=&b; p->fun (); p=&d; p->fun(); }
A.new file open file save file
B.new file new file new file
C.编译出错
D.open file new file save file
第6题: