2016面向对象程序设计B卷

重庆大学《面向对象程序设计》课程试卷2016—2017学年第1学期开课学院：计算机课程号：CST21101考试日期：2017.1.4考试方式： 考试时间：120分钟SECTION 1: Short Answer Questions (40 points, 8 points each)1. Please describe the role of the “class”.2. Describe the key components of STL.3. What is pure virtual function?4. What is copy constructor?5. What is function object ？SECTION 2: Analyzing and Understanding Program (40 points, 10 points each)命题人：曾令秋、刘骥、杨广超组题人：葛亮审题人：邹东升命题时间：2016.12.20教务处制学院专业、班年级学号姓名考试教室公平竞争、诚实守信、严肃考纪、拒绝作弊封线密1. Please write the output result of the following program. #include <iostream>#include <functional>#include <numeric>using namespace std;int myFunction(int x, int y) {return x + 2 * y;}class MyObject {public:int operator()(int x, int y) {return x + 3 * y;}};int main() {int init = 100;int numbers[] = { 10, 20, 30 };cout << "using default accumulate: ";cout << accumulate(numbers, numbers + 3, init);cout << '\n';cout << "using functional's minus: ";cout << accumulate(numbers, numbers + 3, init, minus<int>());cout << '\n';cout << "using custom function: ";cout << accumulate(numbers, numbers + 3, init, myFunction);cout << '\n';cout << "using custom object: ";MyObject obj;cout << accumulate(numbers, numbers + 3, init, obj);cout << '\n';return 0;}2. Please write the output result of the following program. #include<iostream>using namespace std;class Sample{private:int x,y;public:Sample(){x=y=0;}Sample(int i,int j){ x=i; y=j;}void copy(Sample &s);void setxy(int i,int j){x=i;y=j;}void print(){cout<<"x="<<x<<",y="<<y<<endl;}};void Sample::copy(Sample &s){x=s.x;y=s.y;}void func(Sample s1,Sample &s2){s1.setxy(10,20);s2.setxy(30,40);}int main(){Sample p(1,2),q;q.copy(p);func(p,q);p.print();q.print();return 0;}3.Please write the output result of the following program. #include<iostream>using namespace std; class A{private:int a;public:A(int x): a(x){ cout << "A Constructor" << endl;}void Show() const { cout << "A::a=" << a << endl; }};class B: public A{private:int b;public:B(int x, int y): A(x), b(y){ cout << "B Constructor" << endl;}void Show() const { cout << "B::b=" << b << endl; }};class C: public A{private:int c;public:C(int x, int y): A(x), c(y){ cout << "C Constructor" << endl;}void Show() const { cout << "C::c=" << c << endl; }};int main(){B b(1, 6);C c(2, 8);A *p = &c;p->Show();return 0;}4.Please find out the errors in the following program and correct them. #include <iostream>using namespace std;class A{public:A( );A(A);A& operator = (const A& r);int operator[](int index);friend const A operator + (A& r1,A& r2);friend ostream &operator<<( ostream &, const A & ); private:int arr[10];};A::A(){for(int i=0;i<10;i++)arr[i]=i;}A::A(A array){for(int i=0;i<10;i++)arr[i]=array.arr[i];}A& A::operator = (const A& r){for(int i=0;i<10;i++)arr[i]=r.arr[i];return this;}const A operator+ (A& r1, A& r2){A re;for(int i=0;i<10;i++)re[i]=r1[i]+r2[i];return re;}int A::operator[](int index){return arr[index];}ostream &operator<<( ostream & output, const A & r){for(int i=0;i<10;i++)output<<r.arr[i]<<" ";return output;}int main( ){A a1,a2,a3;a3=a1+a2;a3[3]=7;cout<<a3;return 0;}SECTION 3: Write the program to solve the following problem.(20 points, 20 points each)Create an inheritance hierarchy that containing a base class Film and two derived classes Film2D and Film3D. The base class Film should include a data member of type string to represent the film name and a data member of type float to represent the film duration. You should design the constructor to initial the two data members. And there should be a pure virtual function named seeFilm.Derived class Film2D should inherit the functionality of the Film. But also include a data member of type int to represent the film hall(电影厅). You should implement the constructor and the virtual function seeFilm.Derived class Film3D should also inherit the functionality of the Film. and include an additional data member of type int to represent the film private room(电影包房). You also should implement the constructor and the virtual function seeFilm.In the main function, you should create a vector of Film pointers to Film2D and Film3D objects. For each Film in the vector, using member function seeFilm to show what film to see.Please write the code.。