Question

C++

Please help.

1) Create an array to store 10 Point2D points (the Point2D class from A6). Set the coordinates from 0,0 to 9,9. Move all the points left 5 units and up 10 units. Print their new location.

2) Make a new class Point3D which inherits from the Point2D class. The class has one more data member for the z coordinate. There are two constructors, a default one and one with 3 coordinates. Add the new member functions getZ, setZ and moveAlongZ. Override moveToOrigin and printLocation to do the right thing for all 3 coordinates.
Make a few Point3D objects and exercise their functionality.

3) Add a new data member, string color to your Point2D class and a new getter and setter function for color. Create a Point2D object and set its color. Then create a Point3D color and try to set its color. Is the setColor behavior available for a Point3D class? Why or why not?

4) Make a Point2D* pointer variable and point it to a newly created Point2D object.
Make a Point3D* pointer variable and point it to a newly created Point3D object.
Use the pointer variables to move the points and print their locations.

Answer 1

#include<iostream>
using namespace std;

class Point2D
{
private:
int x,y;
string color;
  
public:
Point2D()
{
x = 0;
y = 0;
}
Point2D(int x,int y)
{
this->x = x;
this->y = y;
}
void setX(int x)
{
this->x = x;
}
void setY(int y)
{
this->y = y;
}
int getX()
{
return x;
}
int getY()
{
return y;
}
void setColor(string color)
{
this->color = color;
}
string getColor()
{
return color;
}
void move()
{
this->x = this->x -5;
this->y = this->y+10;
}
void moveToOrigin()
{
x = 0;
y = 0;
}
void print()
{
cout<<"\n("<<x<<","<<y<<")";
}
  
};
class Point3D : public Point2D
{
private:
int z;
  
public:
Point3D():Point2D(0,0)
{
z= 0;
}
Point3D(int x,int y,int z):Point2D(x,y)
{
this->z = z;
  
}
int getZ()
{
return z;
}
void setZ(int z)
{
this->z = z;
}

void moveAlongZ(int z)
{
this->z = this->z +z;
}
void moveToOrigin()
{
setX(0);
setY(0);
setZ(0);
}
void print()
{
cout<<"\n("<<getX()<<","<<getY()<<","<<z<<")";
}
  
};
int main()
{
int i;
Point2D p[10];//array of 10 Point2D Points
//Set the coordinates from 0,0 to 9,9.
for(i=0;i<10;i++)
{
p[i].setX(i);
p[i].setY(i);
}

//Move all the points left 5 units and up 10 units. Print their new location.
for(i=0;i<10;i++)
{
p[i].print();
p[i].move();
p[i].print();
  
}
cout<<endl;
Point2D p1;
p1.setColor("blue");
p1.print();
cout<<p1.getColor();

Point3D p2(3,4,5);
p2.setColor("red");//setColor behavior available for a Point3D class as it derives all functions
p2.print();
cout<<p2.getColor();

//pointer to Point2D object is used to move and print location
Point2D *ptr1 = &p1;
ptr1->move();
ptr1->print();
  
//pointer to Point2D object is used to move and print location
Point3D *ptr2 = &p2;
ptr2->moveAlongZ(4);
ptr2->print();
  
  

return 0;
}

Output:

(0,0)
(-5,10)
(1,1)
(-4,11)
(2,2)
(-3,12)
(3,3)
(-2,13)
(4,4)
(-1,14)
(5,5)
(0,15)
(6,6)
(1,16)
(7,7)
(2,17)
(8,8)
(3,18)
(9,9)
(4,19)

(0,0)blue
(3,4,5)red
(-5,10)
(3,4,9)