Question

C++ program: The aim of this homework assignment is to practice writing hierarchy of classes. Design a hierarchy of Files. You have two different kinds of Files, Text File and an Image File. The files are identified by their name and type, which is identified by either txt or gif extension. An Image file has dimensions of pixel rows and pixel columns. Each pixel has a color depth that can be represented by number of bits. (8 bits is one byte). A Text file is a plain ASCII file that contains characters. Each character is represented by 8 bits. You should provide a function getSize that returns size of a file. Size of a file is measured in bytes. The size of an Image file is calculated by finding how many pixels are needed to store a file multiplied by number of bits to color a single bit divided by 8. The size of the Text file is calculated by counting number of ASCII characters stored in a file. Provide a function to display properties of a File. Properties include: type, name, size, dimensions and color depth for an Image File, characters for a Text File. Provide functions to return type and names of files. Provide function to retrieve character count for a Text file. Provide functions to retrieve dimensions and color depth of an Image File. Write .h and .cpp files for File, Image, and Text classes.

Answer 1

PROGRAM:

File.cpp

#include "File.h"

// Constructor of File that takes File name and type as arguments
File::File(string type, string name) {
   this->type = type;
   this->name = name;
}
//returns the type.
string File::getType() {
   return type;
}

//returns the name of file.
string File::getName() {
   return name;
}

File.h

#ifndef __FILE_H__
#define __FILE_H__

#include <iostream>
#include <string>

using namespace std;

// class declration of File class
class File{
   public:
       // constructor.
       File(string, string);

       string name; // Name of file
       string type; // Type of file

       // virtual functions to be defined in inheriting classes.
       virtual size_t getSize(){}
       virtual void displayProperties(){}

       // returns type and name of file.
       string getType();
       string getName();
};

#endif

Image.cpp

#include "Image.h"

// Constructor for image class with call to constructor
// of parent class.
Image::Image(string name, int r, int c): File(name,"image") {
  
   row = r;
   col = c;

    int** colorDepth = new int*[row];
   for(int i = 0; i < row; ++i)
            colorDepth[i] = new int[col];

}

// returns the size of Image. Please check if the logic is right or not.
size_t Image::getSize() {
   return row*col;
}

// Function to display the properties of file.
void Image::displayProperties() {
   cout<<"File Name : "<<getName()<<endl;
   cout<<"File Type : "<<getType()<<endl;
   cout<<"File Size : "<<getSize()<<endl;
   cout<<"Image File Dimensions : "<<getHeight()<<" x "<<getWidth()<<endl;
   cout<<"Color Depth\n"<<endl;
   for(int i = 0;i<row; i++) {
       for(int j = 0;j<col; j++) {
           cout<<colorDepth[i][j]<<" ";
       }
       cout<<endl;
   }

}

// returns the height of image.
int Image::getHeight() {
   return row;
}

// returns the width of image.
int Image::getWidth() {
   return col;
}

// retunr the image.

char** Image::getColorDepth() {
   return colorDepth;
}

Image.h

#ifndef __IMAGE_H__
#define __IMAGE_H__

#include "File.h"

// Image File class declaration.
class Image: public File {
   public:
       // dimensions of image.
       int row, col;
       // color depth of each pixel
       char **colorDepth;

       // constructor of image
       Image(string name, int r, int c);
       // returns the size of file.
       size_t getSize();
       // display properties of Image file.
       void displayProperties();
       // returns the height of file.
       int getHeight();
       // returns the width of file.
       int getWidth();
       // return sthe color depth.
       char **getColorDepth();

};

#endif

Text.cpp

#include "Text.h"

// constructor definition giving constructor call to its parent.
Text::Text(string name, string contents):File(name,"text") {
   characters = contents;
}

// returns size of file.
size_t Text::getSize() {
   return characters.size();
}

// display Properties of file.
void Text::displayProperties() {

   cout<<"File Name : "<<getName()<<endl;
   cout<<"File Type : "<<getType()<<endl;
   cout<<"File Size : "<<getSize()<<endl;
   cout<<"File contents : "<<getCharacters()<<endl;
}

// returns contents of file.
string Text::getCharacters() {
   return characters;
}

Text.h

#ifndef __TEXT_H__
#define __TEXT_H__

#include "File.h"

// class declaration with public inheritance of File class.
class Text: public File {

   public:
       // file contents.
       string characters;

       Text(string name, string contents);
       size_t getSize();
       void displayProperties();
       string getCharacters();

};

#endif