2009年C++(II)双语_试卷B (1).doc

姓名 学号 学院 专业 座位号 ( 密 封 线 内 不 答 题 )密封线线_ _ 诚信应考,考试作弊将带来严重后果！ 华南理工大学期末考试 C+程序设计(II) 试卷 B注意事项：1. 考前请将密封线内各项信息填写清楚； 2. 所有答案请直接答在试卷上； 3考试形式：闭卷； 4. 本试卷共 四 大题，满分100分，考试时间120分钟。题 号 一 二 三四总分得 分评卷人1. Sate whether each of the following is true or false. (20 scores, each 2 scores) 1) Treating a derived-class object as a bass-class object can be cause errors. ( f )2) Operator static-cast can be used to downcast base-class pointers safely. ( f )3) Operator typeid returns a reference to a type_info object. ( t )4) Key words class and typename as used with a template type parameter specifically mean “any user-defined class type”. ( t )5) When using parameterized manipulators, the header file must be included. ( t )6) Member function read can be used to read data from the input object cin. ( t )7) The programmer must create the cin and cout objects explicitly. ( f )8) operator : would be the name of a function that would provide an overloaded version of the operator : for a specific class. ( f )9) C+ provides for multiple inheritance, which allows a derived class to inherit from many based classes, even if these base classes are unrelated. ( t )10) A constant object must be initialized, it cannot be modified after it is created. ( t )11) If a member initializer is not provided for a member object of a class, the objects default copy constructor is called. ( t )12) The precedence, associativity and “arity” of an operator can not be changed by overloading the operator. ( t )13) In an “is-a” or inheritance relationship, an object of a derived class can not be treated as an object of its base class ( f )14) Base-class constructors are not inherited by derived classes. ( t )15) A “has -a” relationship is implemented via inheritance. ( f )16) All virtual functions in an abstract base class must be declared as pure virtual function. ( f )17) A friend function of a function template must be a function-template specialization. ( f )18) As with static data members of non-template class, static data member of class-template specialization must also be initialized at file scope. ( t )19) An exception thrown outside a try block causes a call to terminate. ( t )20) Data in sequential-access files always is updated without overwriting nearby data. ( (不确定请自行查书)f )2. For each of the following, show the output（25 scores, each 5 scores）C+程序设计(II) 试卷A 第1页 （共10页）1) #include class BASE public: void get( int i,int j,int k,int l ) a = i; b = j; x = k; y = l; void print() cout a = a t b = b t x = x t y = y endl; int a,b;protected:int x, y;class A: public BASE public:void get( int i, int j, int k, int l ) BASE obj3; obj3.get( 50, 60, 70, 80 ); obj3.print(); a = i; b = j; x = k; y = l; u = a + b + obj3.a ; v = y - x + obj3.b; void print() cout a = a t b = b t x = x t y = y endl; cout u = u t v = v endl;private: int u, v ;void main() BASE obj1; A obj2;obj1.get( 6, 9, 8, 7 ); obj2.get( 8, 3, 5, 6 ); obj1.print(); obj2.print();2) #includestruct list int data ;list * next ; ; list * head ; list * insert ( int num ) list * s, *p, *q ; s = new list ; s-data = num ; s-next = NULL ; if ( head = NULL ) head = s ; return( head ) ; if ( head-data s-data ) s-next = head ; head = s ; return ( head ) ; for ( q = head, p = head-next ; p ; q = p, p = p-next ) if ( p-data s-data ) s-next = p ; q-next = s ; return ( head ) ; q-next = s ; return ( head ) ;void showlist( const list * head ) cout now the items of list are: n ; while( head ) cout data next ; cout k ; for (int i=0;i5;i+0 ) head = insert(ki) ; showlist( head ) ; 3) # include template class FF TT a1,a2,a3;public :FF(TT b1,TT b2,TT b3) a1=b1; a2=b2; a3=b3;TT Sum() return a1+a2+a3; ;void main()FF x(2,3,4),y(5,7,9);cout x.Sum() y.Sum()endl;4) # include # include class A int a,b; char op;public:A(int aa,int bb,char ch) a=aa; b=bb; op=ch; int Comp( ) switch (op) case + : return a+b;case - : return a-b;case * : return a*b;case / : if (b!=0) return a/b; else exit(1);case % : if (b!=0) return a%b; else exit(1);default : exit(1); void SetA(int aa,int bb,char ch) a=aa; b=bb; op=ch; ;void main( void ) A x(3,5,*);int a=x.Comp( );x.SetA(4,9,+);a += x.Comp( );x.SetA(8,5,%);a += x.Comp( );cout a=aendl;5) #include using std:cout;using std:cin;using std:endl;int main() int widthValue = 4; char sentence 10 ; cout Enter a sentence: sentence ) cout.width( widthValue+ ); cout sentence endl; cin.width( 5 ); return 0; INPUT: This is a test of the width member functionOUTPUT:3. Answer the following questions.（35 scores）1) Find the errors in the following program correct them, after correcting, show the output.（6 scores）# include # include class Student public: Student(int num) +x; Sno=num;static int get_x() retrun x;int get_Sno() retrun Sno;private:static int x;int Sno;int Student:x=0;void main () coutStudent:get_x()”Student existn”; Student stu1(101); coutStudent:get_x()”Student exist, No.=”get_Sno()”n”; Student *pstu=new Student(102); coutStudent:get_x()”Student exist, No.=”get_Sno()”n”; 2) Fill in the blanks in each of the following program. The program should read the record from the file “C：client.dat”, and display it on screen. (8 scores) #include using std:cout;using std:cin;using std:ios;using std:cerr;using std:endl; using std:ifstream;#include int main() ; if ( ) cerr File could not be opened endl; exit( 1 ); int account; char name 30 ; double balance; while ( ) cout account”t ” name”t ” balance endl;inClientFile.close( ); return 0; 3) Fill in the blanks in each of the following program. The program checks for divide-by-zero exceptions. (4 scores)#include using std:cout;using std:cin;using std:endl;#include using std:exception;class DivideByZeroException : public exception public: DivideByZeroException:DivideByZeroException(): exception( attempted to divide by zero ) ; double quotient( int numerator, int denominator ) if ( denominator = 0 ) ; return static_cast( numerator ) / denominator; int main() int number1; / user-specified numerator int number2; / user-specified denominator double result; / result of division cout number1 number2 ) try result = quotient( number1, number2 ); cout The quotient is: result endl; cout Exception occurred: divideByZeroException.what() endl; cout nEnter two integers (end-of-file to end): ; return 0; 4). According main function, write out function template min. (5 scores)void main() coutmin(10,5,3)endl; coutmin(10.0,5.0,.03)endl; coutmin(a,b,c) and operators.（12 scores）#include #include class Stock public: ; ;private: char Stockcode7;char Stockname7;float p