Which line contains a constructor in this class definition?() public class Counter { // (1) int current, step; public Counter(int startValue, int stepValue) { // (2) set(startValue); setStepValue(stepValue); } public int get() { return current; } // (3) public void set(int value) { current = value; } // (4) public void setStepValue(int stepValue) { step = stepValue; } // (5) }
第1题:
A、public int A{ get {return "100"}}
B、public int A( get;set;)
C、public int A{ get;set;}
D、public int A{ get;}
第2题:
有如下类声明: class MyBASE{ int k; public: void set(iht n){k=n;} int get()coast{return k;} }; class MyDERIVED:pnoted My BASE { protected: int j; public: void set(int m,int n){MyBASE::set(m);j=n;} int get()const{return MyBASE::get()+j;} }; 则类MyDERIVED中保护的数据成员和成员函数的个数是
A.4
B.3
C.2
D.1
第3题:
有如下类声明: class MyBASE { int k: public; void set(int n){k=n;} int get() const{return k;} }; class MyDERIVED: protected MyBASE { protected: int j; public: void set(int m, int n){MyBASE::set(m);j=n;} int get() const{return MyBASE::get()+j;} }; 则类MyDERIVED中保护的数据成员和成员函数的个数是( )。
A.4
B.3
C.2
D.1
第4题:
阅读以下说明和Java程序,将应填入(n)处的字句写在对应栏内。
[说明]
下面程序输出一个矩形面积,以及矩形区域上的假想的作物产量。
[Java程序]
public class MainJava {
public static void main(String[] args){
Lot_size small=new Lot_size();
Lot_size medium=new Lot_size();
small.set(5,5,5,25);
medium.set(10,10,10,50);
System.out.println("For a small lot of area"
+small.get_area()+"\n");
System.out.println("the actual crops are $"
+small.get_data2()+"\n");
System.out.println("and ideal crops are $"
+small.get data()+"\n");
System.out.println("For a medium lot of area"
+medium.get_area()+“\n”);
System.out.println("the actual crops are $"
+medium.get_data2()+"\n");
System.out.println ("and ideal crops are $"
+medium.get_data()+"\n");
}
}
class Crop_assessment{
private int actual_crop;
private int ideal_crop;
public void set(int in_actual,int in ideal){
actual_crop=in_actual;
ideal_crop=in_ideal;
}
public int get_actual_crop(){return (1) ;}
public int get_ideal_crop()(return (2) ;}
}
class Lot_size{
private int length;
private int width;
private Crop_assessment crop= (3) ;
public void set(int 1,int W,int a,int i){
length=1;
width=W;
crop.set(a,i);
}
public int get_area(){return length*width;}
public int get_data()freturn (4) ;}
public int get_data2()(return (5) ;}
}
第5题:
有以下程序: #include <iostream> using namespace std; class A { private: int x,y; public: void set (int i,int j) { x=i; y=j; } int get_y() { return y; } }; class box { private: int length,width; A label; public: void set(int 1,int w, int s,int p) { length=1; width=w; label.set(s,p); } int get_area() { return length*width; } }; int main() { box small; small.set(2,4,1,35); cout<<small.get_area()<<end1; return 0; } 运行后的输出结果是( )。
A.8
B.4
C.35
D.70
第6题:
A.Foo { public int bar() { return 1; }
B.new Foo { public int bar() { return 1; }
C.new Foo() { public int bar() { return 1; }
D.new class Foo { public int bar() { return 1; }
第7题:
有如下类声明: class MyBASE{ int k; public: void set(int n){k=n;} int get( )const{return k;} }; class MyDERIVED:protected MyBASE{ protected: intj; public: void set(int m,int n){MyBASE::set(m);j=n;} int get( )const{return MyBASE::get( )+j;} }; 则类MyDERIVED中保护的数据成员和成员函数的个数是
A.4
B.3
C.2
D.1
第8题:
下面这个程序的结果是 #include<iostream.h> class A { private: int a; public: void seta();int geta();}; void A∷seta() {a=1;} int A∷geta() {return a;} class B { pnvate: int a; publiC: void sera();int geta();}; void B∷seta() {a = 2;} int B∷geta() {return a;} class C:public A,public B { private: int b; public: void display();}; void C∷display() { int b=geta(); cout<<b;} void main() { C c; c.seta(); c.display();}
A.1
B.2
C.随机输出1或2
D.程序有错
第9题:
下列程序的输出结果是______。
include<iostream>
using namespace std;
class base
{
public:
int n;
base(int x){n=x;}
virtual void set(int m){n=m;cout<<n<<'';}
};
class deriveA:public base
{
public:
deriveA(int x):base(x){}
void set(int m){n+=m;cout<<n<<'';}
};
class deriveB:public base
{
public:
deriveB(int x):base(x){}
void set(int m){n+=m;cout<<n<<'';}
};
int main( )
{
deriveA d1(1);
deriveB.d2(3);
base*pbase;
pbase=&d1;
pbase->set(1);
pbase=&d2;
pbase->set(2);
return 0;
}
第10题:
class A { protected int method1(int a, int b) { return 0; } } Which two are valid in a class that extends class A?()