第六章作业

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作业6.12

#include<iostream>#include<string>using namespace std;class area_c1{public:area_c1(double r,double s){height=r;width=s;}virtual double area()=0;protected:double height;double width;};class rectangle:public area_c1{public:rectangle(double r,double s):area_c1(r,s){};double area(){cout<<"矩形面积为："<<height*width<<endl;return height*width;}};class isosceles:public area_c1{public:isosceles(double r,double s):area_c1(r,s){};double area(){cout<<"三角形面积为："<<height*width*0.5<<endl;return height*width*0.5;}};int main(){area_c1 *p;rectangle c2(10.0,5.0);isosceles c3(4.0,6.0);p=&c2;p->area();p=&c3;p->area();system("pause");return 0;}

作业6.13

#include<iostream>#include<string>using namespace std;class Base{public:Base(double i){h=i;}virtual void disp(){cout<<"显示体积"<<endl;}protected:double h;};class Cuboid:public Base{public:Cuboid(double i,double w,double l):Base(i){wide=w;length=l;}void disp(){cout<<"长方体的体积为："<<h*wide*length<<endl;}private:double wide,length;};class Cylinder:public Base{public:Cylinder(double i,double r):Base(i){radius=r;}void disp(){cout<<"圆柱体的体积为："<<3.14*radius*radius*h<<endl;}private:double radius;};int main(){Base *p;Cuboid cu1(10.0,5.0,2.5);Cylinder cy1(4.0,6.0);p=&cu1;p->disp();p=&cy1;p->disp();system("pause");return 0;}

作业6.14

#include<iostream>#include<string>using namespace std;class container{public:container(double radius1){radius=radius1;}virtual double surface_area()=0;virtual double volume()=0;protected:double radius;};class cube:public container{public:cube(double radius1):container(radius1){};double surface_area(){double s1=radius*radius*6;cout<<"正方体的表面积为："<<s1<<endl;return s1;}double volume(){double v1=radius*radius*radius;cout<<"正方体的体积为："<<v1<<endl;return v1;}};class sphere:public container{public:sphere(double radius1):container(radius1){};double surface_area(){double s2=4*3.14*radius*radius;cout<<"圆体的表面积为："<<s2<<endl;return s2;}double volume(){double v2=(4/3)*3.14*radius*radius*radius;cout<<"圆体的体积为："<<v2<<endl;return v2;}};class cylinder:public container{public:cylinder(double radius1,double high1):container(radius1){h=high1;};double surface_area(){double s3=(3.14*radius*radius*2)+(3.14*2*radius*h);cout<<"圆柱体的表面积为："<<s3<<endl;return s3;}double volume(){double v3=3.14*radius*radius*h;cout<<"圆柱体的体积为："<<v3<<endl;return v3;}private:double h;};int main(){container *p;cube cu1(6.0);sphere sp1(5.0);cylinder cy1(5.0,6.0);p=&cu1;p->surface_area();p->volume();p=&sp1;p->surface_area();p->volume();p=&cy1;p->surface_area();p->volume();system("pause");return 0;}

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