东南大学试卷2011-2012_3c++(B)

课程名称程序设计基础及语言2 考试学期11-12-3

适用专业计算机科学与技术

软件工程

考试形式半开卷考试时间长度

笔试

120分钟

机试

100分钟

总分：100分

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课程名称程序设计基础及语言2 考试学期10-11-3卷面60分

适用专业计算机科学与技术

软件工程考试形式半开卷考试时间长度

笔试

120分钟

仅允许携带课程指定教材请将答案写在答题纸上

第一部分笔试

Note: All answers must be writen on answer sheet!

I．Answer the following questions and Read the following programs：（20 scores）

1．What is the notion of friendship in C++? Explain the negative aspects of friendship. (4 scores)

答案：

1.友元的定义；友元的授予关系。共2 分。

2.缺点或举例子。共2 分。

2．What are virtual functions? Distinguish between virtual functions and pure virtual functions.. ( 4 scores)

答案：

1.虚函数定义。共2 分。

2.区别分析。共2 分。

3．What does the following program output? ( 4 scores)

#include

using namespace std;

class A

{public:

A() {cout<<"A class.\n";}

};

class B

{public:

B() {cout<<"B class.\n";}

};

class C : public A

{public:

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C() {cout<<"C class.\n";}

private:

B object1;

};

void main()

{ C object; }

答案：

A class.

B class.

C class.

4．What does the following program output? ( 4 scores)

#include

using namespace std;

class A

{

public:

virtual void f(){cout<<"Base class A."<

class B:public A

{

public:

void f(){cout<<"Derived class B. "<

};

void fun(A&x)

{

x.f();

}

int main()

{

A a;

B b;

fun(a);

fun(b);

return 0;

}

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答案

Base class A.

Derived class B.

5. What does the following program output? ( 8 scores)

# include

using namespace std;

class TeacherID

{ public:

TeacherID(int id =0 ) : value(id)

{ cout <<" Teacher id is "<

{ value = id;

cout <<" Set Teacher id " << value << endl;

}

int getValue() const

{ cout <<" Get Teacher id ";

return value;

}

protected:

int value;

};

class Teacher

{ public:

Teacher(int id =0 ) : ptr(new TeacherID(id))

{ cout <<" Teacher "<

void setValue(int id)

{ ptr->setValue(id); }

int getValue() const

{ return ptr->getValue(); }

~Teacher()

{ delete ptr; }

private:

TeacherID * ptr;

};

int main()

{ Teacher A(35), B;

cout << A.getValue() <

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B.setValue(21);

cout << B.getValue() << endl;

return 0;

}

答案：

Teacher id is 35 <----- Teacher 35

Teacher id is 0 <----- Teacher 0

Get Teacher id 35

Set Teacher id 21

Get Teacher id 21

II．Fill in the following blanks to complete programs. （20 score）

1.Open a file which name is gotten from standard input, and get the line numbers

of the file. Complete the code.

#include

#include

void main() {

int i =0;

ifstream inf;

char fn[20], buf[255];

cin >> fn;

inf.open(fn);

if ( 1 )

{ return; }

While ( 2 ) {

inf.getline(buf,sizeof(buf));

i++

}

cout << “ The line number is : ” << i;

3 ;

}

答案：

1. !inf

2. !inf.eof

3.inf.close()

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2.There is program that use a conditional expression that returns either a double or

an int. Provide an int catch handler and a double catch handler. Show that only the double catch handler executes, regardless of whether the int or the double is returned.

#include

using std::cerr;

int main()

{

try // throw int

{

int a = 7;

double b = 9.9;

// throw int to show that only the double catch handler executes

4 ;

} // end try

catch ( 5 )

{

cerr << "The int value " << x << " was thrown\n";

} // end catch

catch ( 6 )

{

cerr << "The double value " << y << " was thrown\n";

} // end catch

return 0;

}

答案：

4. throw a < b ? a : b

5. int x

6. double y

3.String concatenation requires two operands—the two strings that are to be

concatenated. In the textbook, an overloaded concatenation operator that concatenates the second String object to the right of the first String object, thus modifying the first String object. In some applications, it is desirable to produce

a concatenated String object without modifying the String arguments. Implement

operator+ to allow operations such as string1 = string2 + string3, complete the code.

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#ifndef STRING_H

#define STRING_H

#include

#include

class String

{

riend ostream &operator<<( ostream &output, const String &s ); public:

String( const char * const = "" ); // conversion constructor

String( const String & ); // copy constructor

~String(); // destructor

const String &operator=( const String & );

String operator+( const String & );

private:

char *sPtr; // pointer to start of string

int length; // string length

}; // end class String

#endif

String String::operator+( 7 )

{

String temp;

delete temp.sPtr; // delete temp object?s underlying memory

temp.length = length + right.length;

temp.sPtr = new char[ temp.length + 1 ]; // create space

assert( 8 ); // terminate if memory not allocated

strcpy( temp.sPtr, sPtr ); // left part of new String

strcat( 9 ); // right part of new String

return temp; // enables concatenated calls

} // end function operator+

// overloaded output operator

ostream & operator<<( ostream &output, const String &s )

{

10

return output; // enables concatenation

} /

答案：

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7. const String &right

8. sPtr != 0

9. temp.sPtr, right.sPtr

10.output << s.sPtr;

III．Write programs pies according to the requests（20 score）1．Array is often used in our program, but it cannot implement Append and + operation for append one array to another. Write an ARRAY class template code to implement Append function and + operator for this class. (10scores)

答案：

1.Class template definition 3

2.Append function implementation 3

3.+ operator / friend function 3

4.Test code 2

2．According to the following requirements, and write your program (10 scores)

There are several quadrilaterals (四边形), such as Square, Rectangles, and parallelogram(平行四边形) ; You should write a program to get the summary of these quadrilaterals …area. You should define these necessary classes and write a test program.

答案：

1.Rectangle class definition 5

2.polymorphism 2

3.Driver/ Test/Main function 2

东南大学考试卷（ A 卷）

课程名称程序设计基础及语言2 考试学期10-11-3卷面40分

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适用专业计算机科学与技术

软件工程

考试形式半开卷考试时间长度

机试

100分钟

仅允许携带课程指定教材

第二部分机试

要求：

1．编程：

a)在本地D：或E：盘中，建立自己的文件夹，用来完成程序的编写和调

试。

b)可以：第一题Project(项目名)为Pro1，第二题Project(项目名)为Pro2，

以此类推。

2．提交：

考试结束后，在10分钟之内完成以下操作：

a)在虚拟Z：盘上建立一个以自己的学号命名的文件夹，用于保存上交的

考试程序的源文件。

b)将每题的所有源程序文件“*.cpp”、自定义头文件“*.h”和可执行程

序“*.exe”存入Z：盘自己的目录中。

IV Write and test programs according to the requests（40 scores）1．(10 scores)Define a class for polynomial a*x2+bx+c, overload the +, - operator, and implement two functions, Compute to get its result, Root to get it root.

答案：

1.Operator overload , 4

https://www.360docs.net/doc/b69538407.html,pute function 2

3.Root function 2point

4.Program framework 2 point

2. (30 scores)

This project requires you to write a C++ program that will sort the data file by four columns, from left to right; the columns are named as col0, col1, col2, col3. The sort priority is descent from left to right, for example, that means if the values of col0 are same, then the sort order should be decided by col2. After sort the whole file, you should write the result to file.

For reuse code or used easily, the sort function should work on char, int and float.

The test data file would be (Please create the data file by yourself, you can use notepad or other text file editor )

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Data1.txt

Albert 1166 55.5 150

Babs 1167 60 110

Freida 2323 71 175.5

Big_Al 9876 77 244

Tiny 9875 44 77

Zeke 3333 71.5 188

Yolanda 4444 64.5 114

Slim 5656 72 150

Slimmer 1000 74 148

Too_Slim 7123 73 130

Brunhilda 7124 66 140

Esmerelda 9900 66 135

Bubba 3005 66 200

答案：

1.Open file and read data from file 5

2.The sort function 15 (Override 10, temple 5 )

3.Save the result 5

4.Main function or Test case , base program structure 5

东南大学考试答题纸ＡＮＳＷＥＲＳＨＥＥＴ

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