Could you please help me with this lab? The main.cpp is attached at the bottom.
ID: 3753365 • Letter: C
Question
Could you please help me with this lab? The main.cpp is attached at the bottom. Thank you
In this lab you’ll be provided with a Visual Studio project containing definitions for a parent class called Shape and two childen: Rectangle and Triangle. You will adapt the classes to use polymorphism.
Lab 6a: Getting Started
Download the code from Canvas (FilesLabsLab6.zip (or Lab6.7z) and re-write main() to create pointers and dynamically allocate variables of each type, e.g. to create a Shape pointer to a dynamically allocated Triangle object, you would use the following command:
Shape* sPtr = new Triangle(10,12,5);
Try calling draw( ) on each pointer-object combination. Remember that you can call a function through a pointer to an object using the syntax:
sPtr->draw();
Play around with the code until you can fill out the following table for regular (non-virtual) functions.
Object Type
Shape
Rectangle
Triangle
Pointer Type
Shape
Rectangle
Triangle
Lab 6b: Virtual Functions
Modify the draw( ) function to make it a virtual function. Then play around with the pointers in main( ) to fill out a fresh copy of the table.
Object Type
Shape
Rectangle
Triangle
Pointer Type
Shape
Rectangle
Triangle
Lab 6c: Pointer Arrays
Modify Shape’s copy of the draw( ) function to make it a pure virtual function.
Re-write main( ) to create a statically-allocated 4 x 4 array of Shape pointers.
Dynamically allocate variables for each of the pointers in your array to point at; you can choose what types of objects to store at each location, but make sure to include both Rectangles and Triangles.
Adapt main( ) so that it will prompt the user 3 times for a set of co-ordinates and will then display the object stored at that location in your array. (For the purposes of the lab, you can assume the user doesn’t give you bad co-ordinates).
<main.cpp file>
#include <iostream>
#include "rectangle.h"
#include "triangle.h"
using namespace std;
int main()
{
cout << "I need to be written by you! ";
system("PAUSE");
return 0;
}
Object Type
Shape
Rectangle
Triangle
Pointer Type
Shape
Rectangle
Triangle
Explanation / Answer
Polymorphism as the name derives 'having multiple forms' , is the characteristic of being to assign a different meaning or usage to something in different contexts.
Lab 6a: Answer as follows below:
Illustrate PolyMorphism Functionality using Regular (non-virtual) function
#include<iostream>
using namespace std;
class shape
{
public:
int a,b,c;
void draw()
{
return a*b*c;
}
};
class triangle:public shape
{
public:
int a1,b1,c1;
triangle(int a1,int b1,int c1) //constructor holding three params a1,b1,c1
{
cout<<"Values Assigned are"<<a1<<b1<<c1<<endl;
}
};
int main()
{
shape* sPtr = new triangle(10,12,5);
cout<<"Output is :"<<sPtr->draw()<<endl;
return 0;
}
Lab 6b: Virtual Function Menas Function will Same Name and Same Arguments can be Used in both Parent and Child Class , Implementation can be used differently depends on the End User.
Check the Example Below:
#include<iostream>
using namespace std;
class shape
{
public:
int a,b;
void set_values(int a1,int b1)
{
a=a1;
b=b1;
}
virtual void area()
{
return 0;
}
};
class rectangle:public shape
{
public:
void area()
{
return (a*b);
}
};
class triangle:public shape
{
public:
void area()
{
return ((a*b)/2);
}
};
int main()
{
triangle tri;
rectangle rect;
shape s;
shape* sPtr = &tri;
shape* sPtr1 = ▭
shape* sptr2= &s;
sPtr->set_values(4,4);
sPtr1->set_values(4,4);
sptr2->set_values(4,4);
cout<<"Output 1 is :"<<sPtr->area()<<endl;
cout<<"Output 2 is :"<<sPtr1->area()<<endl;
cout<<"Output 3 is :"<<sptr2->area()<<endl;
return 0;
}
Lab 6c: Pure Virtual Function Means Function will be declared in Parent Class and Assigned to '0' (NULL) and the function definitation will be Child Class
Check the Example Below:
#include<iostream>
using namespace std;
class shape
{
public:
int a,b,c;
virtual void draw() = 0;
};
class triangle:public shape
{
public:
int a1,b1,c1;
triangle(int a1,int b1,int c1) //constructor holding three params a1,b1,c1
{
cout<<"Values Assigned are"<<a1<<b1<<c1<<endl;
}
void draw()
{
return a*b*c;
}
};
int main()
{
triangle tri(10,12,5);
shape* sPtr = &tri;
cout<<"Output is :"<<sPtr->draw()<<endl;
return 0;
}
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