C++程序设计教程--面向对象分册(郑秋生)完整答.docx

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一、选择题

1.C 2.B 3.C 4.A 5.C

6.A 7.C 8 C 9A 10 C

二、阅读题

1．x=2,y=3

2．x=2,y=3

x!=y

3．

Cstatic::va1=0

cs1.vaI=1

cs2.val=2

cs1.val=4

cs2.vaI=4

四、改错题

#include

class person

{

public:

person(int n,char* nam,char s)

{

num=n;

strcpy(name,nam);

sex=s;

cout<<"Constructor called."<

}

~person( )

{

cout<<"Destructor called."<

}

void display( )

{

cout<<"num: "<

cout<<"name: "<

cout<<"sex: "<

}

private:

int num;

char name[10];

char sex;

};

int main( )

{

person s1(10010,"'Wang_li",'f');

s1.display( );

person s2(10011,"Zhang_fun",'m');

s2.display( );

return 0;

}

五、编程题

5．1

#include

using namespace std;

class CBox

{

public :

CBox(double l=0,double w=0,double h=0);

double area();

double volume ();

private :

double lengh;

double width;

double high;

};

CBox::CBox(double l,double w,double h)

{

lengh=l;

width=w;

high=h;

}

double CBox::area()

{

return 2*(lengh*width+lengh*high+width*high);

}

double CBox::volume ()

{

return lengh*width*high;

}

void main()

{

CBox box1(4,5,6);

cout<

}

5.2

#include

using namespace std;

class CPoint

{

public :

CPoint(double a=0,double b=0)

{

x=a;

y=b;

}

CPoint(CPoint & p)

{

x=p.x;

y=p.y;

}

void print()

{

cout<<"("<

}

private :

double x,y;

};

class CLine

{

public:

CLine(double x1=0,double y1=0,double x2=0,double

{

}

CLine(CPoint x,CPoint y):p1(x),p2(y)

{

}

CLine(CLine &lin)

{

p1=lin.p1;

p2=lin.p2;

}

void DrawLine()

{

cout<<"Line form";

p1.print();

cout<<"to";

p2.print();

cout<

}

void Linedel()

{

cout<<"delete line"<

}

void move(CPoint &x,CPoint &y)

{

cout<<"move line"<

p1=x;

p2=y;

}

private :

CPoint p1,p2;

};

void main()

{

CPoint point1(1,5),point2(5,8),point3(20,30),poin

CLine line1(point1,point2);

CLine line2(2,3,8,12);

line1.DrawLine ();

line2.DrawLine ();

line2.move(point3,point4);

line2.DrawLine ();

line2=line1;

line2.DrawLine ();

line1.Linedel ();

}

5.3

#include

using namespace std;

class CComplex

{

public:

CComplex(double, double);

CComplex(CComplex &c); //复数类的拷贝构造函数声明

double GetReal();

double GetImag();

void Print();

private:

double real;

double imag;

};

CComplex::CComplex (double r=0.0, double i=0.0)

{

real = r;

imag = i;

cout<<"调用两个参数的构造函数"<

}

CComplex::CComplex (CComplex &c) //复数类的拷贝构造函数定义

{

real = c.real;

imag = c.imag;

cout<<"调用拷贝构造函数"<

}

double CComplex::GetReal(){return real;}

double CComplex::GetImag(){return imag;}

void CComplex::Print()// 显示复数值

{

cout << "(" << real << "," << imag << ")" << endl;

}

CComplex add(CComplex &x,CComplex &y) //普通函数完

{

return CComplex(x.GetReal() +y.GetReal() ,x.GetI

}

void main(void)

{

CComplex a(3.0,4.0), b(5.6,7.9);

CComplex c(a); //调用复数类的拷贝构造函数

cout << "a = ";

a.Print();

cout << "b = ";

b.Print();

cout << "c = ";

c.Print();

cout<<"c=a+b"<

c=add(a,b);

cout << "c = ";

c.Print ();

}

5.4

#include

using namespace std;

class CStudent //类声明

{

public:

CStudent(char *,float,float,float);

CStudent(CStudent &s);

~CStudent();

void display();

friend float avg(CStudent &s);

private:

char *name;

float grad[3];

};

CStudent::CStudent(char *na,float a,float b,float

{

name=new char[strlen(na)+1];

strcpy(name,na);

grad[0]=a;

grad[1]=b;

grad[2]=c;

}

CStudent::CStudent(CStudent &s)

{

name=new char[strlen(s.name)+1];

strcpy(name,s.name);

grad[0]=s.grad[0];

grad[1]=s.grad [1];

grad[2]=s.grad [2];

}

CStudent::~CStudent()

{

delete []name;

}

void CStudent::display( )

{

int i;

cout<<"name:"<

for(i=0;i<3;i++)

cout<<"grad["<

}

float avg(CStudent &s) //普通函数，需要引用私有成员，声明为学生类的友元函

{

return (s.grad[0]+s.grad[1] +s.grad[2])/3;

}

int main( )

{

CStudent stud1("张三",79,98,82);//定义对象

stud1.display();

cout <<"平均成绩："<

return 0;

}

5.5

#include

using namespace std;

class CString

{

public :

CString(); //缺省构造函数，初始化为空串

CString(char ch,int nRepeat);//用一个字符重复n次，初始化字符串

CString(const char*psz); //用一个字符串初始化

CString(CString &stringser); //拷贝构造函数

~CString();

int GetLength() const;

bool IsEmpty() const;

char GetAt(int nindex) const;

void Setat(int nindex,char ch);

void Print();

int compare(CString& string);

int compare(const char* psz)const;

void Vacate();

private :

char *s;

};

CString::CString()

{

s=NULL;

}

CString::CString(CString& stringser)

{

s=new char[strlen(stringser.s)+1];

if(s!=0)

strcpy(s,stringser.s);

}

CString::CString(char ch,int nRepeat)

{

s=new char[nRepeat+1];

for(int i=0;i

s[i]=ch;

s[nRepeat]='\0';

}

CString::CString(const char*psz)

{

s=new char[strlen(psz)+1];

if(s!=0)

strcpy(s,psz);

}

int CString::GetLength() const

{ int i=0;

while (s[i]!='\0')

i++;

return i;

}

bool CString::IsEmpty() const

{

if(s==NULL)

return 1;

else

return 0;

}

void CString::Vacate()

{

s[0]='\0';

cout<<"Now have vacated string."<

}

char CString::GetAt(int nindex) const

{

if(nindex>1&&nindex<=GetLength()+1)

return s[ nindex-1];

else

return '0';

}

void CString::Setat(int nindex,char ch)

{

if(nindex>1&&nindex<=GetLength()+1)

s[ nindex-1]=ch;

}

void CString::Print()

{

cout<

}

int CString::compare(CString& string)

{

if(strcmp(s,string.s)>0)

return 1;

else if(strcmp(s,string.s)<0)

return -1;

else

return 0;

}

int CString::compare(const char* psz)const

{

if(strcmp(s,psz)>0)

return 1;

else if(strcmp(s,psz)<0)

return -1;

else return 0;

}

CString::~CString()

{

//cout<

if(s!=NULL)

delete[]s;

}

void main()

{

char a[4]="y";char b[4];

CString c1("Hellow"),c2(c1);

cout<<"Stringc1 is:"<<" "; c1.Print();

cout<

cout<<"Stringc2 is:"<<" "; c2.Print();

cout<

CString c3('b',3);

cout<<"Stringc3 is:"<<" "; c3.Print();

cout<

cout<<"*******************以下是对串的基本操作************

int num=c1.GetLength();

char ch;

cout<<"c1的长度是:"<<" "<

ch=c1.GetAt(5);

cout<<"获得字符串c1中第"<<5<<"个字符是:"<

cout<<"下面是插入字符串c1中一个特殊字符'd'"<

c1.Setat(5,'d');

cout<<"插入后字符串c1变为:"<<" ";

c1.Print();

//////////////////////

cout<

if(c1.IsEmpty()==1)

cout<<"String is empty."<

else

cout<<"String isn't empty."<

cout<<"下面是判断字符串c1清空"<

c1.Vacate();

cout<<"清空后输出字符串c1:"<<" \n";

c1.Print();

cout<<"字符串已被清空"<

cout<<"请按任意键继续"<

cin>>b;

///////////////////////////

cout<<"****************以下是对串的赋值*****************

CString c5=c2;

cout<<"String c5=c2 is:"<<" ";c5.Print();

cout<

cout<<"****************以下是对串的比较*****************

int temp=c2.compare(c3);

cout<<"以下比较c2与c3"<

if(temp>0)

cout<<"Stringc2>Stringc3"<

else if(temp<0)

cout<<"Stringc2

else

cout<<"Stringc9==Stringc4"<

cout<

cout<<"以下比较c2与任意字符串Goodboy!"<

if(c2.compare("Goodboy!")>0)

cout<<"Stringc2>'Goodboy!'"<

else if(c2.compare("Goodboy!")<0)

cout<<"Stringc2<'Goodboy!"<

else

cout<<"Stringc2 =='Goodboy!'"<

}

第二章继承和派生

一、选择题

1．D 2.B 3. D

一、阅读程序题

四、编程题

第3章多态性

3.1 简答题

3.2 填空题

习题四

第 1 章类和对象一、选择题 1.C 2.B 3.C 4.A 5.C 6.A 7.C 8 C 9A 10 C 二、阅读题 1．x=2,y=3 2．x=2,y=3 x!=y 3． Cstatic::va1=0 cs1.vaI=1 cs2.val=2 cs1.val=4 cs2.vaI=4 四、改错题 #include #include class person { public: person(int n,char* nam,char s) { num=n; strcpy(name,nam); sex=s; cout<<"Constructor called."<

}; int main( ) { person s1(10010,"'Wang_li",'f'); s1.display( ); person s2(10011,"Zhang_fun",'m'); s2.display( ); return 0; } 五、编程题 5．1 #include using namespace std; class CBox { public : CBox(double l=0,double w=0,double h=0); double area(); double volume (); private : double lengh; double width; double high; }; CBox::CBox(double l,double w,double h) { lengh=l; width=w; high=h; } double CBox::area() { return 2*(lengh*width+lengh*high+width*high); } double CBox::volume () { return lengh*width*high; } void main() { CBox box1(4,5,6);

cout< using namespace std; class CPoint { public : CPoint(double a=0,double b=0) { x=a; y=b; } CPoint(CPoint & p) { x=p.x; y=p.y; } void print() { cout<<"("<

void DrawLine() { cout<<"Line form"; p1.print(); cout<<"to"; p2.print(); cout< using namespace std; class CComplex

//复数类的拷贝构造函数声明 r=0.0, double i=0.0) { public: CComplex(double, double); CComplex(CComplex &c); double GetReal(); double GetImag(); void Print(); private: double real; double imag; }; CComplex::CComplex (double { real = r; imag = i; cout<<"调用两个参数的构造函数"< using namespace std; class CString { public : //用一个字符串初始化 CString(); //缺省构造函数，初始化为空串 CString(char ch,int nRepeat);//用一个字符重复 n 次，初始化字符串 CString(const char*psz); CString(CString &stringser); //拷贝构造函数 ~CString(); int GetLength() const; bool IsEmpty() const; char GetAt(int nindex) const; void Setat(int nindex,char ch); void Print(); int compare(CString& string); int compare(const char* psz)const; void Vacate();

private : char *s; }; CString::CString() { s=NULL; } CString::CString(CString& stringser) { s=new char[strlen(stringser.s)+1]; if(s!=0) strcpy(s,stringser.s); } CString::CString(char ch,int nRepeat) { s=new char[nRepeat+1]; for(int i=0;i

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