写出下面程序的输出( )。 public class Test { public static void main (String args[ ]) { iht x=1, y=2; System. out. println ("result="+x+y); System. out. println ("result="+(x+y));
A.result=12 result=12
B.result=3 result=3
C.result=3 result=12
D.result=12 result=3
第1题:
下面程序运行时输出结果为【 】。
include<iostream.h>
include<malloc.h>
class Rect
{
public:
Rect(int1,int w)(length=1;width=w;)
void Print(){cout<<"Area:"<<length *width<<endl;)
void *operator new(size-t size){return malloc(size);}
void operator delete(void *p){free(p)
private:
int length,width;
};
void main()
{
Rect*p;
p=new Rect(5,4);
p->Print();
delete p;
}
第2题:
将下面程序补充完整。
include <iostream>
using namespace std;
class Base{
public:
【 】 fun(){return 0;} //声明虚函数
};
class Derived:public Base{
public:
x,y;
void SetVal(int a,int b){}
int fun(){return x+y;}
};
void 【 】 SetVal(int a,int b){x=a;y=b;} //类Derived成员函数
void main(){
Derived d;
cout<<d.fun()<<endl;
}
第3题:
使用VC6打开考生文件夹下的工程test17_1,此工程包含一个源程序文件test17_1.唧,但该程序运行有问题,请改正程序中的错误,使程序的输出结果如下:
Vehicle message
Car message
Vehicle message
源程序文件test17_1.cpp 清单如下:
include <iostream.h>
class vehicle
{
int wheels;
float weight;
public:
/***************** found *****************/
void message(void){ cout<<"Vehicle message\n";}
};
class car:public vehicle
{
int passenger_load;
public:
/***************** found *****************/
void message (void){cout>>"Car message\n";}
};
class truck:public vehicle
{
int passenger_load;
float payload;
public:
int passengers(void){return passenger_load;}
};
void main()
{
vehicle * unicycle;
unicycle=new vehicle;
/***************** found *****************/
unicycle.message()
delete unicycle;
unicycle=new car;
unicycle->message();
delete unicycle;
unicycle=new truck;
unicycle->message();
delete unicycle;
}
第4题:
第5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6题:
下列程序的运行结果是______。
include<iostream.h>
class test
{
private:
int hum;
public:
test( );
int TEST( ){return num+100;)
~test( );
};
test::test( ){num=0;)
test::~test( ){cout<<"Destructor is active"<<endl;)
void main( )
{
test x[3];
cout<<x[1].TEST( )<<endl;
}
第7题:
有如下程序: #include<iostream> usingnamespacestd; classTest( public: Test( ){} Test(constTest8Lt){cout<<1;} }; Testfun(Test&u){Testt=U;returnt;} intmain( ){Testx,y;x=fun(y);return0;} 运行这个程序的输出结果是( )。
A.无输出
B.1
C.1l
D.111
第8题:
下列程序的运行结果是【 】。
include <iostream. h>
class test
{
private:
int num;
public:
test()
int TEST() {return num+100;}
~test()
};
test::test(){num=0;}
test::~test(){cout<<"Destructor is active"<<endl;}
void main()
{
test x[3]
cout<<x[1]. TEST()<<endl;
}
第9题:
第10题:
阅读下面的程序, 写出运行后输出的结果。 #include<iostream> using namespace std; class A { public: A(){cout<<"A";} }; class B :public A { public: B(){cout<<"B";} }; void main() { B b1; }