中山大学信息科学及技术学院计算机科学系C程序设计A2014.06试卷

1、警 示中山大学授予学士学位工作细则第六条考试作弊不授予学士学位计算机科学系 2014学年度第二学期 程序设计II 期末考试试题( A )任课教师：吴维刚 刘聪 考试形式： 闭卷 考试时间：2小时年级： 班别： 专业： 姓名： _ 学号： _成绩 1. Single Choice (20points)Please choose the choice that best completes the statement in the questionWhich of the following statements about object-oriented programming (OOP) is

2、 NOT correct?A) The key idea of OOP is to build programs using software object.B) OOP offers many advantages: simplicity, modularity, modifiability, and so on.C) OOP is more efficient than POP in terms of programming productivity.D) An object-oriented program can run faster than a procedure-oriented

3、 program with the same functionality. Which of the following statements about static data members is NOT correct?A) A static data member can initialized at declaration.B) A static data member refers to a member whose value cannot be changed after initialized.C) We may access static data members with

4、out before any object created.D) A static data member is shared by objects of the same class. Which of the following variables cannot be a member of class A? A) A *p B) A a C) A &r D) string sWhich of the following statements is not a characteristic of a constructor?A) The name of a constructor must

5、 be the same as the class.B) A constructor can be overloaded.C) The parameters of constructor may have default values.D) The return type of a constructor must be void.If C is a class name, how many times is the constructor of C called in C a, b2, *p2;?A) 2 B) 3 C) 4 D) 5If p is a pointer to an objec

6、t with a member function x(), which of the following access to x() is correct?A) *p.x B) p-x() C) *p-x() D) *p.x() Which of the following is NOT a member function of a class?A) constructor B) destructor C) friend function D) copy constructorIf class X is declared to be the friend of a class Y, then

7、which of the following statements is correct? A) Y can access the protected members of X.B) X can access the private members of Y. C) If class Z is declared to be friend of X, Z becomes Ys friend.D) Y becomes Xs friend automaticallyWhich of the following declarations of constant function member is c

8、orrect?A) void print() const;B) const void print();C) void const print();D) void print(const); To realize polymorphism, the following two elements are necessary:A) Multiple-inheritance and virtual function B) Virtual inheritance and function overloading C) Virtual function and pointer of base classD

9、) Virtual inheritance and dynamic castingWith the base class B and its derived D, which of the following statements has a compiling error? A) B * base = D(); B) B * base = new D(); C) B base = D(); D) B &base = D();Which of the following statements about virtual function is correct?A) Virtual functi

10、on is not a member function.B) Virtual function must be a static function.C) A virtual function in a base class must be defined, even though it may not be used.D) A virtual function is function without implementation.Which of the following statements about upcast is NOT correct?A) Upcast is to cast

11、a pointer of a base class to that of an derived class.B) C+ performs type checking for pointer to prevent errors.C) Upcast is always safe since an object of a derived class has everything of its base class.D) Upcast does not have to be explicit.Which of the following definitions about pure virtual f

12、unction is correct?A) virtual void fun()=0;B) void fun(int)=0;C) virtual void fun(int);D) virtual void fun(int)Which of the following statements about the operator new is NOT correct?A) The new operator is used to allocate storage dynamically.B) The new operator returns a object or a simple variable

13、. C) The delete operator should be used to destroy the variable/object created by new.D) The new operator is necessary to realize deep copy.Which of the following statements about constructor is correct?A) the constructor of a base class is executed after the constructor of a derived classB) the con

14、structor of a base class cannot have any parameter.C) the constructor of a base class can be used to create an object of a derived classD) the constructor of a base class need to be called explicitly.An exception thrown by a function can beA) caught by only the catch block of the same functionB) han

15、dled exactly onceC) can only be an object of the exception classes defined by C+ standardD) a variable defined by the userWith string s1; char s220; cins2;, which statement is NOT correct? A) s1 = s1+s2; B) s1.append(s2); C) s1 = s2; D) s2 = s1; Which is NOT an I/O object?A) std:cin B) std:cout C) s

16、td: cerr D) iostreamTo output data into a file, it is necessary for you toA) make sure the file is already there before opening it.B) open it in binary mode.C) know the format of the data.D) convertthedatatocharacters(oranobjectoftypestring).2. Output analysis (20points, 5points for each)Please writ

17、e down the printout of the following programs.1) A program about copy constructor1 #include2 usingnamespacestd;34 classPoint5 6 public:7 Point(int xx=0)8 x=xx;9 1011Point(Point &p)12x=p.x;13 cout”Calling the copy constructor”endl;141516int getX()17 return x;18 19 private:20 int x;21 ;2223 void fun1(

18、 Point p)24 coutp.getX()endl;25 2627 Point fun2()28Point a(1);29return a;30 31 int main()32 Point a(4);33 Point b=a;34 coutb.getX()endl;35 fun1(b);36 b=fun2();37 coutb.getX()endl;38 2) A program about inheritance1#include2usingnamespacestd;34 classB056 public:7 voidprint() cout”B0”endl; 8 ;910 class

19、B1:publicB01112 public:13void print() cout”B1”endl; 14 ;1516 class D1: public B117 18 public:19 void print() cout”D1”print();25 2627 int main()28B0 b0; B1 b1; D1 d1; B0 *p;29p=&b0;30fun(p);31p=&b1;32 fun(p);33 p=&d1;34 fun(p);35 3) A program about string and vector1 #include2 #include3 using namespa

20、ce std;45 int main()6 int n=7;7vector v;8for(int i=1; i=n; i+)9 v.push_back(i);10 11 int j=2;12 for( int i=1; i=n; i+)13 coutvj” ”;14 v.erase(v.begin()+j);15 if(v.size()!=0)16 j=(j+2)%v.size();17 18 194) A program about template and exception1 #include2 #include3 usingnamespacestd;45 classEmptyStack

21、Exception;67 template8 classStack9 10 private:11vectorimpl;1213 public:14 voidpush(constE&e)15 impl.push_back(e);16 1718Epop()19if(impl.size()=0)20throwEmptyStackException();21Ee=implimpl.size()-1;22impl.pop_back();23returne;2425 ;2627 intmain()28 Stackstack;29 for(inti=0;i3;+i)30 stack.push(0.5+i);

22、3132try33while(true)34coutstack.pop()endl;353637catch(EmptyStackException&ex)38coutcaught:EmptyStackExceptionendl;3940 3. Error Correction (20points)Thereare5errorsintotalineachofthefollowingprogram.Youneedtofindout10ofthem,whichyouaremostconfident.Ifyoulistmorethan10errors,onlythefirst10errorswillb

23、egraded. 1). Class and object1)#include 2)using namespace std;3)4) class MyClass 5) 6) public:7) MyClass(int x) 8) member=x; 9) 10) GetMember() 11) return member;12) 13) void SetMember(int m) 14) member=m; 15) 16) void MyClass() 17) private:18) int member=0; 19) ;20)21)int main()22) MyClass obj1; 23

24、) MyClass obj2(3);24) obj1.SetMember(1);25) coutobj2.memberendl; 26) return 0;27)2). Inheritance and Template1)#include 2)using namespace std;3)4)template5)class BASE 6) 7) public: 8) void show(TYPE obj)9) coutobjendl; 10) 11) 12) 13)template 14)class DERIVED: :public BASE 15)public: 16) void show(T

25、YPE obj1, TYPE1 obj2)17) coutobj1endl;18) BASE:show(obj2); 19) 20);21)22)int main()23)DERIVED obj;24) BASE *pBase=&obj; 25) DERIVED *pDerived=pBase; 26) obj.show(“Pi is”, 3.14);27) return 0;28) 3). Template and vector1)#include 2)#include 3)using namespace std;4) 5)template 6)class MyQueue 7)8)priva

26、te:9) vector impl; 10) 11)public: 12) void enqueue(E &e) 13) impl.push_back(e); 14) return e;15) 16) E dequeue(); 17); 18)template 19)E MyQueue:dequeue() 20) E e = impl0; 21) impl.pop_back();22) return e;23) 24)int main() 25) MyQueue q; 26) q.enqueue(100); 27) q.dequeue(0); 28)4. Concept explanation (20points) Please explain the following concepts with concrete examples. You can choose 4 out of all the 5 questions to an