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 #include class person public: person(int n,char* nam,char s) num=n; strcpy(name,nam); sex=s; coutConstructor called.endl; person( ) coutDestructor called.endl; void display( ) coutnum: numendl; coutname: nameendl; coutsex: sexendlendl; 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 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 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);coutbox1.area()endl;coutbox1.volume()endl;5.2#include using namespace std;class CPointpublic :CPoint(double a=0,double b=0)x=a;y=b;CPoint(CPoint & p)x=p.x;y=p.y;void print()cout(x,y);private :double x,y;class CLinepublic:CLine(double x1=0,double y1=0,double x2=0,double y2=0):p1(x1,y1),p2(x2,y2)CLine(CPoint x,CPoint y):p1(x),p2(y)CLine(CLine &lin)p1=lin.p1;p2=lin.p2;void DrawLine()coutLine form;p1.print();coutto;p2.print();coutendl; void Linedel() coutdelete lineendl; void move(CPoint &x,CPoint &y) coutmove lineendl; 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 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(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();coutc=a+bendl;c=add(a,b); cout c = ; c.Print ();5.4#include #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 c) name=new charstrlen(na)+1; strcpy(name,na); grad0=a; grad1=b; grad2=c;CStudent:CStudent(CStudent &s) name=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; coutname:nameendl;for(i=0;i3;i+)coutgradi:gradiendl; 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 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)