C--程序设计教程--面向对象分册(郑秋生)完整答案(共45页).doc
精选优质文档-倾情为你奉上第1章 类和对象一、 选择题1.C 2.B 3.C 4.A 5.C6.A 7.C 8 C 9A 10 C二、阅读题1x=2,y=32x=2,y=3x!=y3Cstatic:va1=0cs1.vaI=1cs2.val=2cs1.val=4cs2.vaI=4四、改错题#include <string.h>#include <iostream.h>class person public:person(int n,char* nam,char s num=n;strcpy(name,nam; sex=s;cout<<"Constructor called."<<endl; person( cout<<"Destructor called."<<endl; void display( cout<<"num: "< endl ; cout<<"name: "< endl ; cout<<"sex: "< endl << endl ; private:int num;char name10;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51#include <iostream>using namespace std;class CBoxpublic :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 hlengh=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< endl ; cout< endl ; 5.2#include <iostream>using namespace std;class CPointpublic :CPoint(double a=0,double b=0x=a;y=b;CPoint(CPoint & px=p.x;y=p.y;void print(cout<<"("< private :double x,y;class CLinepublic:CLine(double x1=0,double y1=0,double x2=0,double y2=0:p1(x1,y1,p2(x2,y2CLine(CPoint x,CPoint y:p1(x,p2(yCLine(CLine &linp1=lin.p1;p2=lin.p2;void DrawLine(cout<<"Line form"p1.print(;cout<<"to"p2.print(;cout<<endl;void Linedel(cout<<"delete line"<<endl;void move(CPoint &x,CPoint &ycout<<"move line"<<endl;p1=x;p2=y;private :CPoint p1,p2;void main(CPoint point1(1,5,point2(5,8,point3(20,30,point4(40,50;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 <iostream>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"<<endl;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"<<endl;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 /普通函数完成两个数的加法,对象作为函数参数,return CComplex(x.GetReal( +y.GetReal( ,x.GetImag (+y.GetImag (;void main(voidCComplex 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"<<endl;c=add(a,b; cout << "c = " c.Print (;5.4#include <iostream>#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 grad3; ;CStudent:CStudent(char *na,float a,float b,float cname=new charstrlen(na+1;strcpy(name,na;grad0=a;grad1=b;grad2=c;CStudent:CStudent(CStudent &sname=new charstrlen(s.name+1;strcpy(name,s.name;grad0=s.grad0;grad1=s.grad 1;grad2=s.grad 2;CStudent:CStudent(delete name;void CStudent:display( int i; cout<<"name:"< endl ; for(i=0;i<3;i+cout<<"grad"<<i<<":"< i << endl ; 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数return (s.grad0+s.grad1 +s.grad2/3;int main( CStudent stud1("张三",79,98,82; /定义对象stud1.display(;cout <<"平均成绩:"<<avg(stud1<<endl;return 0;5.5#include <iostream>using namespace std;class CStringpublic :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* pszconst;void Vacate(;private :char *s;CString:CString(s=NULL;CString:CString(CString& stringser s=new charstrlen(stringser.s+1;if(s!=0strcpy(s,stringser.s;CString:CString(char ch,int nRepeats=new charnRepeat+1;for(int i=0;i<nRepeat;i+si=ch;snRepeat='0'CString:CString(const char*pszs=new charstrlen(psz+1;if(s!=0strcpy(s,psz;int CString:GetLength( const int i=0;while (si!='0'i+;return i;bool CString:IsEmpty( constif(s=NULLreturn 1;elsereturn 0;void CString:Vacate(s0='0'cout<<"Now have vacated string."<<endl;char CString:GetAt(int nindex constif(nindex>1&&nindex<=GetLength(+1return s nindex-1;elsereturn '0'void CString:Setat(int nindex,char chif(nindex>1&&nindex<=GetLength(+1s nindex-1=ch; void CString:Print(cout< endl ; int CString:compare(CString& string if(strcmp(s,string.s>0return 1;else if(strcmp(s,string.s<0return -1;elsereturn 0;int CString:compare(const char* pszconst if(strcmp(s,psz>0return 1;else if(strcmp(s,psz<0return -1;else return 0;CString:CString(/cout<<endl<<"析构:"< endl ; if(s!=NULLdeletes;void main( char a4="y"char b4;CString c1("Hellow",c2(c1;cout<<"Stringc1 is:"<<" " c1.Print(;cout<<endl;cout<<"Stringc2 is:"<<" " c2.Print(;cout<<endl;CString c3('b',3;cout<<"Stringc3 is:"<<" " c3.Print(;cout<<endl;cout<<"*以下是对串的基本操作*"<<endl;int num=c1.GetLength(;char ch;cout<<"c1的长度是:"<<" "< endl ; ch=c1.GetAt(5;cout<<"获得字符串c1中第"<<5<<"个字符是:"<<ch<<endl;cout<<"下面是插入字符串c1中一个特殊字符'd'"<<endl;c1.Setat(5,'d'cout<<"插入后字符串c1变为:"<<" "c1.Print(;/cout<<endl;if(c1.IsEmpty(=1cout<<"String is empty."<<endl;elsecout<<"String isn't empty."<<endl;cout<<"下面是判断字符串c1清空"<<endl;c1.Vacate(;cout<<"清空后输出字符串c1:"<<" n"c1.Print(;cout<<"字符串已被清空"<<endl;cout<<"请按任意键继续"<<endl;cin>>b;/cout<<"*以下是对串的赋值*"<<endl;CString c5=c2;cout<<"String c5=c2 is:"<<" "c5.Print(;cout<<endl;cout<<"*以下是对串的比较*"<<endl;int temp=pare(c3;cout<<"以下比较c2与c3"<<endl;if(temp>0cout<<"Stringc2>Stringc3"<<endl;else if(temp<0cout<<"Stringc2 endl ; elsecout<<"Stringc9=Stringc4"<<endl;cout<<endl;cout<<"以下比较c2与任意字符串Goodboy!"<<endl;if(pare("Goodboy!">0cout<<"Stringc2>'Goodboy!'"<<endl;else if(pare("Goodboy!"<0cout<<"Stringc2<'Goodboy!"<<endl;elsecout<<"Stringc2 ='Goodboy!'"<<endl;第二章 继承和派生一、 选择题1D 2.B 3. D一、 阅读程序题四、编程题4.1 #include <iostream.h>#include<string.h>#define PAI 3.14class Circle public:Circle(r=0;Circle (double dr=d;double area(return(PAI*r*r;void display1(cout<<"桌子的面积:"< endl ; private:double r;class Tablepublic:Table(heig=0;Table (double h heig=h;void display2(cout<<"桌子的高度:"<<heig<<endl;private:double heig;class Roundtable : public Circle,public Tablepublic:Roundtable(strcpy(color,"白色"Roundtable(double a,double b,char* c:Circle(a,Table(bstrcpy(color,c;void display ( display1(;display2(;cout<<"桌子的颜色:"< endl ; private:char color20;void main(Roundtable s(2.0,3.0,"黑色"s.display(;4.2如果Age在基类中被定义为私有的,SetAge(int n不能直接给Age赋值,如果Age是基类的公有成员变量,则可以直接赋值。class Animalpublic:Animal(;int Age;class Dog:public Animalpublic:Dog(;Void SetAge(int nAge=n;4.3#include <iostream.h>class Rectanglepublic:Rectangle (double l,double wlength=l,width=wdouble area(return length*width;霸州市第二届中小学试题库优秀试题征集评比活动一年级(上册)语文学科试题上报单位:王庄子乡靳家堡村学校设计人姓名:刘婧题号一二三四五六七八九十十一得分得分评卷人一、 按顺序填空(10分)a o u b p m n l g hyi ye yue 得分评卷人二、 填补下列不全的音节。(8分)( z jiàn ) (dà ù (zhú ái ( l àn 再 见 大 树 竹 排 两 岸(d qíu ) ( l s ( diàn sh ( w ba打 球 绿 色 电 视 尾 巴得分评卷人三、 把下列拼读的部分补充完整。(5分)g ( ( ) guo b ( ) bal ( ) liú q ( ) qu 得分评卷人四、 看拼音写词语。(16分)sh f shn t máo jn ch zi( ( ( ( xio níu fi j zhng ch diàn ch( ( ( ( 得分评卷人五、写反义词。(12分)近 早 大黑 有 出得分评卷人六、 连线。(8分)z zh c ch子 足 真 座 纸 春 唱 草 穿得分评卷人七、照样子,填写合适的量词。(5分)一( 朵 )花 一( )小河 一( )小鸭一( )雨伞 一( )红旗 两( )兔子 得分评卷人八、写出下列字的笔顺。(6分)左: 今: 火: 得分评卷人九、按古诗填空。(10分)( )看 ( ) 有 ( ,近 听 ( ) ( )声。春 去 ( ) ( )在,( )( )( )不 惊。得分评卷人十、按课文填空,回答问题。(7分)谁的尾巴长?谁的尾巴短?谁的尾巴好像一把伞?猴子的尾巴( ),兔子的尾巴( ),松鼠的尾巴好像( )。1. 把课文内容补充完整。2. 短文告诉了我们 种动物的尾巴的特点。3. 你喜欢谁的尾巴?为什么?得分评卷人十一、写话。(13分)小朋友,你喜欢吃水果吗?你最喜欢吃什么水果?请你说出它的颜色,外形特点,为什么喜欢吃?不少于20字,不会写的字可以用拼音代替。答案一、按顺序填空(10分)a o e i u ü b p m f d t n l g k hyi wu yu ye yue yuan (每空1分二、填补下列不全的音节。(8分)( zài jiàn ) (dà shù (zhú pái ( ling àn 再 见 大 树 竹 排 两 岸(d qíu ) ( l sè ( diàn shì ( wi ba打 球 绿 色 电 视 尾 巴<<"长:"< endl每空; cout<<"三、;class Cuboid:public Rectangle( o ) guo b ( a ),double w,double h:Rectangle(L,whigh=h,volume=L*w*high ;double vol(return area(*high;void show (;private:double high;看拼音写词语。( 16 分)(每字 0.5 分) display1(;cout<<"高:"< endl ; cout<<"体积:"<<vol(<<endl;void main(Cuboid cub (10,20,30;cub.show(;4.4#include <iostream.h>class Vehiclepublic:Vehicle(:maxspeed(0,weight(0Vehicle( 出void run ( cout<<" 可以奔跑"<<endl; void stop ( cout<<" 可以停止奔跑"<<endl;private:double maxspeed;double weight;class Bicycle:virtual public Vehiclepublic:Bicycle (double m,double w,double h:Vehicle(m,w,height(h private:double height;class Motorcar : virtual public Vehiclepublic:Motorcar (double m,double w,double s:Vehicle(m,w,setnum(sprivate:double setnum;class Motorcycle:public Bicycle,public Motorcarpublic:Motorcycle(double m,double w,double h,double s:Bicycle(m,w,h,Motorcar(m,w,s, Vehicle(m,w;void main(Motorcycle s1(300,10,6,30; s1.run(;s1.stop(;如果不把Vehicle设置为虚基类近 听第3水 ) (无3.1 简答题春 去 ):(还 )在,3.1.2 运算符重载后,优先级和结合性如何?( 人 )( 来 )( 鸟 在每一种编译系统中,运算符实际上都对应一个函数,只是这种运算对用户具有透明性,使用者并不知道函数的存在。运算符重载实际上是运算符函数的重载,所以运算符的重载实际上是函数的重载。编译程序对运算符重载的选择,遵循着函数重载的选择原则。当遇到不很明显的运算符时,编译程序将去寻找参数相匹配的运算符函数。3.1.4十、按课文填空,回答问题。(7(1) 不可臆造新的运算符(2) 坚持四个不能改变。),兔子的尾巴( 短 ),松鼠的尾巴好像( 一把伞 运算符的返回类型(3)C+规定,运算符中,参数类型都是内部类型时,不允许重载。 “:、3种 (3.1.5 运算符重载必须遵循哪些原则?3. (答案略(2(2)十一、写话。(13分)说出它的颜色,外形特点,为什么喜欢吃,语句通顺,不少于203.2.1 C+中多态性包括两种多态性: (1) 和 (2) 。前者是通过 (3) 实现的,而后者是通过 (4) 和 (5) 来实现的。答案:(1)编译时的(2)运行时的(3)函数和运算符的重载(4)类继承关系(5)虚函数3.2.2 纯虚函数定义时在函数参数表后加 (1) ,它表明程序员对函数 (2) ,其本质是将指向函数体的指针定为 (3) 。答案:(1)=0(2)不定义(3)NULL3.2.3在基类中将一个成员函数说明成虚函数后,在其派生类中只要 (1) 、 (2) 和 (3) 完全一样就认为是虚函数,而不必再加关键字 (4) 。如有任何不同,则认为是 (5) 而不是虚函数。除了非成员函数不能作为虚函数外, (6) 、 (7) 和 (8) 也不能作为虚函数。答案:(1)同虚函数名(2)同参数表(3)同返回类型。如基类中返回基类指针,而派生类中返回派生类指针是允许的(4)virtual(5)重载(6)静态成员函数(7)内联函数(8)构造函数第三大题答案:31答案:#include<iostream.h>#include<string.h>class CStudentchar name20;char nativeplace20;char code30;int age;float score;public :CStudent(char *, char*,char*,int ,float;CStudent(CStudent &s;void display(;float operator+(CStudent s1;CStudent:CStudent(char *name, char*native,char*code,int age,float scorestrcpy(this->name,name;strcpy(this->nativeplace,native;strcpy(this->code,code;this->age=age;this->score=score;CStudent:CStudent(CStudent &sstrcpy(this->name,s.name;strcpy(this->nativeplace,s.nativeplace;strcpy(this->code,s.code;this->age=s.age;this->score=s.score;void CStudent:display(cout< nativeplace <<" "< endl ; float CStudent:operator +(CStudent s1return this->score+s1.score;void main(CStudent w("whl","zhengzhou","",30,90;w.display(;CStudent c("ctm","zhengzhou","",30,90;c.display(;cout<<w+c<<endl;32答案:#include<iostream.h>#include<string.h>#include<math.h>class CTrianglefloat a,b,c;public:CTriangle(float a,float b,float cthis->a=a;this->b=b;this->c=c;float GetArea(float t=(a+b+c/2;return sqrt(t*(t-a*(t-b*(t-c;float operator +(CTriangle treturn this->GetArea(+t.GetArea(;void main(CTriangle tr1(3,4,5,tr2(6,8,10;cout< endl ; 33答案:#include<iostream.h>class BaseClasspublic:virtual void f1(cout<<"BaseClass:f1("<<endl;void f2(cout<<"BaseClass:f2("<<endl;class DerivedClass: public BaseClasspublic:void f1(cout<<"DerivedClass:f1("<<endl;void f2(cout<<"DerivedClass:f2("<<endl;void main(DerivedClass d1;BaseClass* Bptr;DerivedClass* Dptr;Bptr=&d1;Bptr->f1(;Bptr->f2(;Dptr=&d1;Dptr->f1(;Dptr->f2(;习题四一、选择题1D 2A 3B 4C 5. C 6C 7 A 二、简答题1什么叫做流?流的提取和插入是指什么?I/O流在C+中起着怎样的作用?答:流是一种抽象,它负责在数据的生产者(程序/文件)和数据的消费者(文件/程序)之间建立联系,并管理数据的流动。一般意义下的读操作在流数据抽象中被称为(从流中)提取,写操作被称为(向流中)插入。完成数据从动态(内存)到静态(外存)的转换,或着是从静态(外存)到动态(内存)的转换。2什么是字节流、字符流和二进制流?答:根据对字节内容的解释方式,字节流分为字符流(也称文本流)和二进制流。字符流将字节流的每个字节按ASC字符解释,它在数据传输时需作转换,效率较低。例如源程序文件和文本文件都是字符流。由于ASC字符是标准的,所以字符流可以直接编辑,显示或打印,字符流产生的文件通行于各类计算机。二进制流将字节流的每个字节以二进制方式解释,它在数据传输时不作任何转换,故效率高。但各类计算机对数据的二进制存放格式各有差异,且无法人工阅读,故二进制流产生的文件可移植性较差。3cerr和clog作用是什么?有何区别?答:对于输入提示信息或输出结果而言, cerr和clog的用法相同,但作用不同。cerr的作用是向标准错误设备(standard error device输出有关出错信息。cerr流中的信息只能在显示器输出。当调试程序时,往往不希望程序运行时的出错信息被送到其他文件,而要求在显示器上及时输出,这时应该用cerr,cerr流中的信息是用户根据需要指定的。clog流对象也是标准错误流,它是console log的缩写。它的作用和cerr相同,都是在终端显示器上显示出错信息。不同的是cerr不经过缓冲区,直接向显示器上输出有关信息,而clog中的信息存放在缓冲区中,缓冲区满后或遇endl时向显示器输出。4用什么方法来控制输入输出流中出现的错误?答:为提高程序的可靠性,应在程序中检测I/O流的操作是否正常。当检测到流操作出现错误时,可以通过异常处理来解决问题。5比较读写文本文件与二进制文件的异同。答:从文件编码的方式来看,文件可分为ASCII码文件和二进制码文件两种。ASCII文件也称为文本文件,这种文件在磁盘中存放时每个字符对应一个字节,用于存放对应的ASCII码。例如,数5678的存储形式为:ASC码: 十进制码: 5678 共占用4个字节。ASCII码文件可在屏幕上按字符显示, 例如源程序文件就是ASCII文件,用DOS命令TYPE可显示文件的内容。 由于是按字符显示,因此能读懂文件内容。二进制文件是按二进制的编码方式来存放文件的。 例如, 数5678的存储形式为: 只占二个字节。二进制文件虽然也可在屏幕上显示, 但其内容无法读懂。C+系统在处理这些文件时,并不区分类型,都看成是字符流,按字节进行处理。 输入输出字符流的开始和结束只由程序控制而不受物理符号(如回车符的控制。 因此也把这种文件称作“流式文件”。6随机读写是什么意思,常用于哪种类型的文件?答:在C+中可以由程序移动文件指针,从而实现文件的随机访问,即可读写流中任意一段内容。一般文本文件很难准确定位,所以随机访问多