青岛理工大学C++考试真题

I．Judgment. (The right answer is “T”, the wrong one is “F” .Each judgment is 2 points, total 201. Both constructor and destructor of base class can be inherited by derived class.2. Static data member is shared by all objects of this class.3. Constructors can be declared as virtual function.4. When overloading an operator, at least one argument of the resulting overloaded operator must be of a class type.5. Constructors have no return type.6. A friend function is not a member of the class, but it can access the private members of that class.7. We can only list types of formal parameters in function declarations.8. There are loop statements can be wrote in the inline function.9. The assignment operator can only be overloaded into a member function.10.In C++, STL is a standard function template library.II．Fill in the blank . (Each blank is 1 point, total:10 points)1. The default access labelfor class is ___________.2. The constructor and the destructor must have the same as the class,.3. The member functions of derived classes can get access to __ _ members and __ members ofa base class, do not get access to private members of a base class.4. In C++, a class with a pure virtual function is called an _______.5. Suppose we have a class named as Dc, when such code like “Dc a[5], b(2),*p;” is implemented, the system will auto-call the constructor of class Dc for _______ times.6. Statement ___________ can catch all kinds of exceptions.7. In C++, in addition to “.”, “*”, “sizeof”, the operator ________ and _______ are also can’t be overload.8. Class istream is used to support input operation, and class _______ is used to support output operation.III．Single Choice (Each choice is 2 point, total:10 points)1. ( )Usually copy constructor’s parameter isA) the name of some object B) the reference of some objectC) member name of some object D) the pointer of some object2. ( )Which is wrong about constructor?A) The compiler may supply default constructor.B) Constructors can have parameters, and returned value.C) Constructors can be overloaded.D) Constructors can have default parameter value.3. ( )Which is wrong about friend?A) The keyword friend is used to declare the friend.B) The member function of one class can be the friend of another class.C) The friend functions can access any specified access label member.D) The friend functions access the member of some object by this pointer. 4. ( )The purpose of virtual base class is.A) to eliminate（消除）ambiguity B) to make a program simpleC) to increase the run efficiency D) to reduce the object codes5. ( )Which is right about the static data member?A) The static data member can not be called by the object name.B) The static data member can be initialized in the constructors.C) The static data member belongs to a certain class.D) The static data member must not be initialized in the file scope.Ⅳ.Point out the error the following programming and explain the reason(write out error linenumber, total:10points)1. const size=10; //L1int a[size]; //L22. class Point{ public:Point() { c=0; x=-1 ;} //L3Point(Point pobj); //L4Point(Point& p) ; //L5 private:int x ; //L6const int c ; //L7} ;3. #include <iostream>using namespace std;class Example{public:Example (int i){m=i;} //L8void Example() { m=0; } //L9void show(){cout<<m;} //L10 private:int m; //L11};int main( ){ Example ex1; //L12Example ex2(5); //L13ex2.m+=10; //L14Example.show(); //L15return 0;}4. int x=9 , *x_ptr=&x; //L16int y=78; //L17 4. int x=9 , *x_ptr=&x;int y=78;*x_ptr = &y ;*x_ptr = &y ; //L18 5. #include<iostream>using namespace std;class BC{ public:void set_x(int a) {x=a;} //L19 protected:int get_x() const { return x; } //L20 private:int x;};class DC : public BC{ public:void add2( ) //L21{ int c=get_x( ); set_x(c+2);} //L22 void add3( ) { x+=3; } //L23 };int main( ){ DC d;d.set_x(3); //L24cout<<d.get_x( )<<endl; //L25d.x=77; //L26d.add2(); //L27return 0;}Ⅴ．Write out the results of the following programs. (Each subject is 5 points; total:30 points) 1. #include <iostream>using namespace std;char str[20]="Hello C++ world.";char &rep(int k){return str[k];}int main( ){rep(15)='!';cout<<"The string is:"<<str<<endl;return 0;}2.#include <iostream>#include <iomanip>using namespace std;int main(){ double values[]={1.23,35.36,657.6,778.2};char* names[]={"Zoot","Jimmy","A1","Stan"};for(int i=0;i<4;i++)cout<<left<<setw(6)<<names[i]<<right<<setw(6) <<fixed<<setprecision(1)<<values[i]<<endl;return 0;}3. #include <iostream>const double PI=3.14;using namespace std;class Figure{ public:Figure(){};virtual double area() const {return 0.0;}};class Circle : public Figure{ public:Circle(double myr){R=myr;}double area() const {return PI*R*R;}protected:double R;};class Rectangle : public Figure{ public:Rectangle (double myl,double myw){L=myl;W=myw;}double area() const {return L*W;}private:double L,W;};void func(Figure &p){ cout<<p.area()<<endl;}int main(){ Figure fig;cout<<"Area of Figure is "; func(fig);Circle c(3.0);cout<<“Area of circle is ”; func(c);Rectangle rec(4.0,5.0);cout<<"Area of rectangle is "; func(rec);return 0;}4. #include <fstream>#include <iostream>using namespace std;int main(){cout<<“Opening data.txt for appending.”<<endl;ofstream fout;fout.open(“data.txt”,ios::app);if ( fout.fail( ) ){cout<<“Input file opening failed.”<<endl;exit(1);}fout<<“Hello C++ world!”<<endl<<“This is an appending program.”<<endl;fout.close();cout<<“End of appending to file.”<<endl;return 0;}Suppose that there is the content: “This is a test program!” in the d ata.txt.when the program executes, what content will exist in the data.txt? 5. #include <iostream>using namespace std;class Base1{ public:Base1(int i){ a=i; cout<<"constructing Base1 a=" <<a<<endl; } private:int a;};class Base2{ public:Base2(int i){b=i; cout<<"constructing Base2 b=" <<b<<endl;} private:int b;};class Base3{ public:Base3(int i){c=i;cout<<"constructing Base3 c=" <<c<<endl; } private:int c;};class Derivedclass:public Base1{ public:Derivedclass(int i,int j,int k,int m);private:int d;Base2 f;Base3 g;};Derivedclass::Derivedclass(int i,int j,int k,int m):Base1(i),g(j),f(k){ d=m;cout<<"constructing Derivedclass d="<<d<<endl; } int main(){ Derivedclass x(5,7,6,8);return 0;}6. #include<iostream >using namespace std;template<class T>class A{T m;static T n;public :A(T a) : m(a) { n+=m; }void disp( ){ cout<<"m="<<m<<",n="<<n<<endl; }};template<class T>T A<T> ::n=0;int main(){A<int> a(2) , b(3);a.disp();b.disp();A<double> c(1.6),d(5.4);c.disp();d.disp();return0;}Ⅵ．Programming Design. (total 20 points)1. (10 points) To define a Point class to satisfy the given test function main:int main(){Point p1(1,2), p2;cout<<"请输入点p2的坐标："<<endl; p2.input( );p1.show( ) ; //输出(1,2)p2.show( ) ;cout<<"The distance of point p1 and point p2 is "<<p1.dist(p2)<<endl;return 0;}2. (10 points) To design a RMB class to satisfy the given test function main:int main(){ RMB m1(100,2,8), m2(200,9), m;if( m1==m2) cout<<”两者的钱数相等！”<<endl;else cout<<”两者的钱数不相等！”<<endl;m=m1+m2;m=m+50;m.show( ); //按元角分输出return 0;}2011~ 2012学年第一学期C++面向对象程序设计课程试卷标准答案及评分标准A(√)/B( ) 卷_专业软件103-5I．Judgment. (The right answer is “T”, the wrong one is “F” .Each judgment is 2 points, total 20 points.)IIIII ．Single Choice (Each choice is 1 point, total:10 points) 1．B 2.B 3.D 4.A 5.CⅤ．Write out the results of the following programs. (Each subject is 5 points; total:30 points) 1. The string is Hello C++ world! 2. Zoot 1.2 Jimmy 35.4 A1 657.6 Stan 778.24. This is a test program!Hello C++ world!This is an appending program.5.constructing Base1 a=5constructing Base2 b=6 constructing Base3 c=7constructing Derivedclass d=8Ⅵ. Programming Design. (total 20 points) 1.#include <iostream>#include <cmath> //1 point using namespace std; class Point {public: Point(int xx,int yy) { x=xx; y=yy; } // 2 points Point(){x=y=0;} //2 points void input() //2 points { cin>>x>>y; } void show(){ cout<<'('<<x<<','<<y<<')'<<endl; } // 1 point3. Area of Figure is 0 Area of circle is 28.26 Area of rectangle is 20 6. m=2,n=5m=3,n=5m=1.6,n=7m=5.4,n=7double dist(Point p); //2 pointsprivate:int x;int y;};double Point::dist(Point p){ return sqrt((p.x-x)*(p.x-x)+(p.y-y)*(p.y-y)); }int main(){Point p1(1,2), p2;cout<<"请输入点p2的坐标："<<endl; p2.input( );p1.show( ) ; //输出(1,2)p2.show( ) ;cout<<"The distance of point p1 and point p2 is "<<p1.dist(p2)<<endl;return 0;}2. #include<iostream>using namespace std;class RMB{public:RMB (int y,int j,int f){yuan=y;jiao=j;fen=f;} //1 pointRMB (int y,int j) { yuan=y; jiao=j; fen=0; } //1 pointRMB (int y) { yuan=y; jiao=0; fen=0; } //2 pointsRMB (){yuan=0;jiao=0;fen=0;}; //1 pointvoid show(){cout<<yuan<<"元"<<jiao<<"角"<<fen<<"分"<<endl;} //1 point RMB operator+(RMB m); //2 pointsfriend bool operator==(RMB my,RMB your) //1 point{if(my.yuan ==your.yuan && my.jiao ==your.jiao &&my.fen &&your.fen ) return true;else return false;}private:int yuan,jiao,fen; //1 point};RMB RMB::operator+(RMB m){RMB mon;mon.yuan =yuan+m.yuan ;mon.jiao =jiao+m.jiao ;mon.fen =fen+m.fen ;if (mon.fen >=10){ mon.fen -=10;mon.jiao ++;}if(mon.jiao >=10){ mon.jiao -=10;mon.yuan ++;}return mon;}int main(){ RMB m1(100,2,8), m2(200,9), m;if( m1==m2) cout<<”两者的钱数相等！”<<endl;else cout<<”两者的钱数不相等！”<<endl;m=m+50;m.show( ); //按元角分输出return 0;}Judgment.(The right answer is “T”,the wrong one is “F”.)The keyword friend is used in a function definition,not in a function declaration.（F）Values stored in the elements of a vector may be accessed the same way as values stored in the elements array.（）A class can only have one subclass.（F）It is not possible to access the attributes of a class with no member fuctions(methods).（F）The meaning of all the C++ operators(such as *,+etc.)is fixed and cannot be changed.(T)If you do not declare a constructor in a class, the compiler will furnish a default constructor for you automatically.(T)An object of a class A can be a private member of a class B.(T)Because we cannot instantiate objects of abstract base classes, we cannot declare pointers and references to abstract base classes.(F)In dynamic binding an object’s type must be known at compile time for a virtual function call to be compiled.()The assignment operator can only be overloaed into a nonmember function.(F)Fill in the blank.There are four stream object defined in <iostream.h>,the object_____cerr________is the standarderror output stream.In C++,Encapsulation is achieved by making______class（类）_______.In a class,maximum number of destructors are_______1______.Assume that A is a class,the constructor of class A had be called____4_____times when the statement “A a[3],b(6),*p;”was executed.Assume that the name of type parameter is defined as T,when defining the function template,you should add prefix statement____template<class T>____.If the name of a is Myclass,then the name of its destructor is________it has _______return values.If class B is derived from class A,class C is derived from class B,an object of class C is created,then the called order of constructor is_________In the C++,in addition to “,”,”* ”,”sizeof ”,the operator_______and_______are also can’t be overload.选择1、（）Which are isn’t the member funcition of a class?A)Constructor B)Destructor C)Friend Function D)Copy Constructor2、（）Opening the file”d:\file.dat”and write data to it,which statement should we use?A)ifstream infile(“d:\file.dat”,ios::in); B)ifstream infile(“d:\\file.dat”,ios::in);C)ofstream infile(“d:\file.dat”,ios::out); D)fstream infile(“d:\\file.dat”,ios::in/ios::out);3、（）Which is wrong about class?A)Class is one kind of type, it encapsulates data and operates.B)Object is a instance of a class.C)One object can only belong to a class.D)There are only one object in a class.4、（）Usually the parameter of a copy constructor is_________.A) a object B)the member of a objectC)the reference of a object D)the pointer of a object5、( ) If there are a pure virtual function in a class,then we call this class as_____________A)abstract class B)virtual basic class C)derived class D)none of above Point out the error the following programming and explain the reason(write out the error line member，total:15 points)1、class Move{private:double x;double y;public:Move(double a = 0, double b=0); //set x,y to a,bshowmove()const; //shows current x,y values;Move add(const Move & m)const; //this function adds x of m to x of invoking object to get//new x, adds y of m to y of invoking//object to get new y,create a new//move object initialized to new x,y values, and returns it reset(double a=0,double b=0); //reset x,y to a,b};Int main(){ Move Point1(3,4),Point2,Point3;cout<<”x and y values of Point1 are:”;Point1.showmove();Point2.reset(5,6);Point3=Point1.add(Point2);cout<<”x and y values of Point3 are:”;Point3.showmove();return 0; }Create member function definitions to satisfy the test function main.2、（9 points）Deine a Complex class,it has two private member real and image.1)Please write a constroctor which can accept 0-2 parameters,a copy constructor, a Print function which can display the value of data member;2) Write Set function:setReal and setImage,which can change the value of private data member;3)Overload operator “+”and”-”;which can finish addition and subtraction of two complex.The main() function listed as following:void main(){Complex c1(1.5,7.9);Complex c2(c1);c2.setReal(2.7);c2.setImage(0);c1.Print();c2.Print();(c1+c2).Print();(c1-c2).Print();};一、Judgement(Please judge the following 10 sentence, and full the blank of the list withyour result. The right answer is “√”, the wrong one is “×”.20 point.)1. We can assign a value to a constant when it is declared. ×2. int sort (int arr[ ]) and float sort (float arr[ ]) are overloaded functions.√3．A function that the compiler generates using a function template is called an instance of the function template or a template function. ×4．A constant pointer to a constant cannot be changed to point to another constant of the same type. √5．Just like the structure members, the default access specifier for class members is private. （×）6．If we defined a constructor in a class, we must define a destructor to destroy it. （×）7．When passing an object to a function, its copy is created in memory. But it does not,invoke （调用）a class constructor. （×）8. When instantiating an object of a derived class, constructors of all of its parent class are executed prior to the derived-class constructors. Destructor functions are always executed inthe same order. ×9. Virtual functions are used with inheritance to resolve conflicts when both base and derived class declare member functions with the same signature. ×10. The member defined in base-class as protected or private can only be accessed by the member functions in derived-class. ×二、Fill in the blank (each blank has 1 point，total:24 score)1．A pointer type specifies the type of __object_________ to which the pointer points 2．Passing a reference to a function is like passing the ___ the address of the variable_used as the argument in the function call.3．A program that uses _______dynamically ___________allocates exactly the amount of memory needed during its execution.4．The default access specifier(指示符，区分符，说明符) for data members and member function are _____private_______5．If member function of class don’t proviet to initialize a class object ,___default constructor_____________is automatically called.6．When member function is called, _____________of the member function point function called.7．While the friend function is not a member of class,it has access to the class______all menber___________ .8．When declared static data member outside the class, _______class name______________must precede the static data member name.9．Constant member functions must be used when working with____constant data member ______________.10. A binary operator can be overloaded by using a ________friend function_______________ rather thana member function.11. ______control_______________access specifier is used only when implementing inheritance.12. To pass arguments from a derived-class to a base-class, a ________derived-class constructor ______________must be created.NUM12345678910RESULT三、Write out result of the following programs(each subject is 6 point;total:36 point) 1．# include <iostream.h>class A {int a;public:A(int aa=0) { a=aa; }~A() { cout <<"Destructor A!"<<a<<endl; }};class B:public A {int b;public:B(int aa=0,int bb=0):A(aa) { b=bb; }~B() { cout <<"Destructor B!"<<b<<endl; }};void main() {B x(5),y(6,7);}2.#include<iostream.h>class Counter{public:Counter(){val=0;cout<<”Default Constructor of Counter”<<endl;} Counter(int x){val=x;cout<<”Coustructor of Counter:”<<val<<endl;} ~Counter(){cout<<”Destructor of counter:”<<val<<endl;} private:int val;};class Example{public:Example(){ val=0;cout<<”Default Constructor of Example”<<endl;} Example(int x):c2(x){val=x,cout<<”Constructor of Example:”<<val<<endl;}~Example(){cout<<”Destructor of Example:”<<val<<endl;}void Print(){cout<<”value=”<<val<<endl;}private:Counter c1,c2;int val;};void main(){Example e1,e2(4);e2.Print()}3. #include<iostream.h>class Test;void fun1(Test t);Test fun2();class Testpublic:Test(int n=1){val=n;cout<<"Con."<<endl;}Test(const Test&t){val=t.val;cout<<"Copy con."<<endl;} Test&operator=(Test&t){val=t.val;cout<<"Assignment."<<endl;return *this;}private:int val;};void main(){Test t1(1);Test t2=t1;Test t3;t3=t1;fun1(t2);t3=fun2();}void fun1(Test t){}Test fun2(){Test t;return t;}4．#include<iostream.h>class Person{public:Person(){cout<<"Constructor of Person."<<endl;}~Person(){cout<<"Destructor of Person."<<endl;} };class Student:public Person{public:Student(){cout<<"Constructor of Student."<<endl;}~Student(){cout<<"Destructor of Student."<<endl;} };class Teacher:public Person{public:Teacher(){cout<<"Coustructor of Teacher."<<endl;}~ Teacher(){cout<<"Destructor of Teacher."<<endl;} };void main(){Student s;Teacher t;}5. #include <iostream.h>#include< iomanip.h>void main ( ){int a[9]={2,4,6,8,10,12,14,16,18};for ( int i=0 ; i<9 ;i++){ cout<<setw(5)<< *(a+i) ;if ((i+1)%3==0) cout<<endl;};}结果： 2 4 68 10 1214 16 186. #include<iomanip.h>void LE(int *a ,int *b){ int x=*a;*a = *b; *b=x ;cout<<*a<<' '<<*b<<endl ;}void main( ){ int x=10, y=25;LE(&x,&y); cout<<x<<' '<<y<<endl ;}四、Programming Design (Each subject is 10 point)1.一个圆型游泳池如图所示。