Question

c++

6. Define classes shape, and classes circle and square, which inherit from shape. At the bottom of the page is a sample program using these classes, followed by its output. (a) Class shape has abstract virtual constant functions area and border which do not take arguments and which return double. It has a virtual constant function where which has no arguments and returns its lo- cation. It has a private field of type location and a ctor which accepts a location as an argument and which also works as a default ctor by using a default location argument of (o,o). [4v] using location - paircdouble, double; class shape t (b) Class circle inherits from shape and has a ctor which also behaves as a default ctor by providing default arguments. Its first ctor argument is a constant reference to a location and its second argument is the value of its private radiusfield. (For a circle, border circumference.) Use M_PI from the library for the value of π. Override area (tr*) and border (2tr). [2V] (c) Class square inherits from shape and is similar to circle, except that it has a private field called edge which specifies the length of one edge of the square. Its constructor has the same specification as for circle. It overrides area of the square and border (the sum of the lengths of the edges). [2]

Answer 1

//C++ program

#include<iostream>
#include <utility>
#include <math.h>
using namespace std;

class shape{
   protected:
       pair <double,double> location;
   public:
       shape(double x=0,double y=0){
           location.first = x;
           location.second=y;
       }
       double area();
       double border();
  pair <double,double> where(){
           return location;
       }
};

class circle:public shape{
   private:
       double radius;
   public:
       circle(double x=0,double y=0,double r=0):shape(x,y){
           radius=r;
       }
       double area(){
           return M_PI*radius*radius;
       }
       double border(){
           return 2*M_PI*radius;
       }
};

class square:public shape{
   private:
       double edge;
   public:
       square(double x=0,double y=0,double e=0):shape(x,y){
           edge=e;
       }
       double area(){
           return edge*edge;
       }
       double border(){
           return 4*edge;
       }
};