C++习题答案-5.doc

第五章 多态性5.7 D5.8 A5.9 A5.10 D5.11 C5.12 C5.13 不正确。虚函数在派生类中重新定义时，其函数原型，包括函数类型，函数名，参数个数与参数类型的顺序，都必须与基类中的原型完全相同。5.14 765.15 This is C+ book.第1个字符：T第16个字符：k第26个字符：数组下标超界！5.16m=1.5千米5.17#includeusing namespace std;#includeconst int row=2;const int col=3;class arraypublic:array();array(int a, int b, int c, int d, int e, int f);void get_array();void display();array operator+(array &x);array operator-(array &x);private:int varrowcol;array:array()for(int i=0;irow;i+)for(int j=0;jcol;j+)varij=0;array:array(int a, int b, int c, int d, int e, int f)var00=a;var01=b;var02=c;var10=d;var11=e;var12=f;void array:get_array()cout”please input 2*3 dimension data:”endl;for(int i=0;irow;i+)for(int j=0;jvarij;void array:display()for(int i=0;irow;i+)for(int j=0;jcol;j+)coutsetw(5)varij;coutendl;array array:operator+(array &x)array temp;for(int i=0;irow;i+)for(int j=0;jcol;j+)temp.varij=varij+x.varij;return temp;array array:operator-(array &x)array temp;for(int i=0;irow;i+)for(int j=0;jcol;j+)temp.varij=varij-x.varij;return temp;int main()array x(11,22,33,4,5,6);array y,z;y.get_array();cout”Display object x”endl;x.display();cout”Display object y”endl;y.display();z=x+y;cout”Display object z=x+y”endl;z.display();z=x-y;cout”Display object z=x-y”endl;z.display();return 0;5.18#includeusing namespace std;#includeconst int row=2;const int col=3;class arraypublic:array();array(int a, int b, int c, int d, int e, int f);void get_array();void display();friend array operator+(array &x, array &y);friend array operator-(array &x, array &y);private:int varrowcol;array:array()for(int i=0;irow;i+)for(int j=0;jcol;j+)varij=0;array:array(int a, int b, int c, int d, int e, int f)var00=a;var01=b;var02=c;var10=d;var11=e;var12=f;void array:get_array()cout”please input 2*3 dimension data:”endl;for(int i=0;irow;i+)for(int j=0;jvarij;void array:display()for(int i=0;irow;i+)for(int j=0;jcol;j+)coutsetw(5)varij;coutendl;array operator+(array &x, array &y)array temp;for(int i=0;irow;i+)for(int j=0;jcol;j+)temp.varij=x.varij+y.varij;return temp;array operator-(array &x, array &y)array temp;for(int i=0;irow;i+)for(int j=0;jcol;j+)temp.varij=x.varij-y.varij;return temp;int main()array x(11,22,33,4,5,6);array y,z;y.get_array();cout”Display object x”endl;x.display();cout”Display object y”endl;y.display();z=x+y;cout”Display object z=x+y”endl;z.display();z=x-y;cout”Display object z=x-y”endl;z.display();return 0;5.19#includeusing namespace std;class complexpublic:complex(double r=0, double i=0);friend complex operator+(const complex c1, const complex c2);void print();private:double real, imag;complex:complex(double r, double i)real=r;imag=I;complex operator+( const complex c1, const complex c2)complex temp;temp.real=c1.real+c2.real;temp.imag=c1.imag+c2.imag;return temp;void complex:print()cout”(”real”, ”imag”)”endl;int main()complex c1(2.5,3.7), c2(4.2,6.5);complex c;c=c1+c2;c.print();return 0;5.20#include using namespace std;const double pi=3.1416;class containerprotected:double radius;public:container(double radius1):radius(radius1);virtual double surface_area()=0;virtual double volume()=0;class cube:public containerpublic:cube(double radius1):container(radius1);double surface_area() return 6*radius*radius;double volume() return radius*radius*radius;class sphere:public containerpublic:sphere(double radius1):container(radius1);double surface_area() return 4*pi*radius*radius;double volume() return 4*pi*radius*radius*radius/3;class cylinder:public containerprivate:double height;public:cylinder(double radius1,double height1):container(radius1) height=height1;double surface_area() return 2*pi*radius*radius+2*pi*radius*height;double volume() return pi*radius*radius*height;int main()container* ct;cube cb(5.0);sphere sh(5.0);cylinder cn(5.0,6.0);coutcube surface_area vo