Create a struct (called AFile) that stores information for an audio file (like a

ID: 3770339 • Letter: C

Question

Create a struct (called AFile) that stores information for an audio file (like an mp3 file). Each struct should have: A string object For The Title A String object For The Artist Name| An Int For Length of The File (In Seconds) An Enumerated Type For Mp3 (For .Mp3 Files) or Wav (For .Wav Files) Your database of audio files will consist of a dynamic array of these structs. This is essentially your database. Your program must: allow entry of a single affile into the database. Allow the user to print all afile information. Allow editing of an afile entry. You must also handle cases where the size of your dynamic array is increased. For example. If your array starts off as an array of length 10, before you can get input into element 11, you need to create a new larger array of say... Length 20, copy the elements over and then get input into the new array. Also... Include options to save and retrieve your database of audio files to/from a text file, upon retrieval, load your data into a dynamic array of aflles. You will probably have to read through the file once to determine the number of entries in the file and then a second time to actually read the data in...

Explanation / Answer

Answer:

Program code to copy:

// SongsStructureList.cpp :

//Header files

#include "stdafx.h"

#include <iostream>

#include <string>

#include <fstream>

#include <iomanip>

using namespace std;

enum type{MP3, WAV};

//AFile structure

struct AFile

{

string artistName;

string songTitle;

int length;

type value;

};

//prototypes

void addSong(AFile *s, int &count);

void deleteSong(AFile *s, int &count);

void editFile(AFile *s, int count);

void printSongsData(AFile *s, int count);

void sortData(AFile *s, int count);

void copyData(AFile *s, AFile *newS, int &count);

//main function

int main()

{

int MAX=300;

//array of structures

AFile *s = new AFile [MAX];

AFile *newS = new AFile;

string name;

string typo;

string ch;

//increment variable and choice variables

int count=0;

int choice;

//file object

fstream infile("topsong.txt");

//if the file exist proceed to read the

//data from the file

if(infile)

{

//loop till end of the file

while(!infile.eof())

{

infile>> s[count].artistName;

infile>> s[count].songTitle;

infile>> s[count].length;

infile>>typo;

if(typo.compare("MP3")==0)

s[count].value=MP3;

else

s[count].value=WAV;

count++;

}

//else print a error message

else

{

cout<<"Sorry! File not found."<<endl;

}

//close the file

infile.close();

if(count >= MAX)

copyData(s, newS, count);

//sort the elements in the array

sortData(s, count);

//menu

{

cout<<" Songs List "<<endl;

cout<<"Please select from the following menu choices: "<<endl;

cout<<"1. Add a song"<<endl;

cout<<"2. Delete a song"<<endl;

cout<<"3. Print"<<endl;

cout<<"4. Edit"<<endl;

cout<<"5. Exit"<<endl;

cout<<"Enter choice: ";

cin>>choice;

cout<<endl;

//depending on the user choice

//the values are printed

switch(choice)

{

case 1:

addSong(s, count);

break;

case 2:

deleteSong(s, count);

break;

case 3:

printSongsData(s, count);

break;

case 4:

editFile(s, count);

sortData(s, count);

break;

case 5:

exit(0);

break;

default:

cout<<"Enter your choice properly."<<endl;

}

}while(true);

system("pause");

return 0;

}

//definition of the addSong method

//adds a song with the respective details

void addSong(AFile *s, int &count)

{

string typo;

cout<<"Enter the name of the artist(Fname_Lname): ";

cin>>s[count].artistName;

cout<<"Enter the title of the song: ";

cin>>s[count].songTitle;

cout<<"Enter the length of the song: ";

cin>>s[count].length;

cout<<"Enter the song audio format(MP3/WAV): ";

cin>>typo;

if (typo.compare("MP3")==0)

s[count].value = MP3;

else

s[count].value = WAV;

count++;

sortData(s, count);

}

//definition of the deleteSong method

//delets a song as per the user request

void deleteSong(AFile *s, int &count)

{

AFile song;

string tsong;

bool flag;

cout<<"Enter the song title: ";

cin>>tsong;

for(int i=0;i<count;i++)

{

if(tsong.compare(s[i].songTitle)==0)

{

flag=true;

song=s[i];

s[i]=s[i+1];

}

if(flag)

{

count--;

}

//definition of the printSongsData method

//prints the details of the list of songs

void printSongsData(AFile *s, int count)

{

cout<<setw(-5)<<"Artist Name "<<setw(20)<<"Song Title "<<setw(20)<<" Length "<<setw(10)<<" Format "<<endl;

cout<<" =============================================================================== ";

for(int i=0;i<count;i++)

{

cout<<s[i].artistName<<" "<<setw(20)<<s[i].songTitle<<setw(15)<<s[i].length<<setw(10);

if(s[i].value == MP3)

cout<<"MP3"<<endl;

else

cout<<"WAV"<<endl;

}

//sortData method will sort the list of songs in the list

void sortData(AFile *s, int count)

{

AFile temp;

for (int i=0; i <count; i++)

{

for(int j=0;j<count;j++)

{

if((s[i].artistName.compare(s[j].artistName))<0)

{

temp = s[i];

s[i] = s[j];

s[j] = temp;

}

//copyData method will copy the data from the old list to the list

//if the size of array is outofbounds

void copyData(AFile *s, AFile *newS, int &count)

{

int size = 2*count;

newS = new AFile[size];

for(int i=0;i<count;i++)

{

newS[i]=s[i];

}

s = new AFile[size];

s=newS;

count = size;

}

//editFile method will edits the data of the old list

void editFile(AFile *s, int count)

{

string name;

int option;

cout<<"Enter the title so that the record data can be modified."<<endl;

cout<<"Enter the title of song(Song_name): ";

cin>>name;

for(int i=0;i<count;i++)

{

if(name.compare(s[i].songTitle)==0)

{

cout<<"1. Artist Name"<<endl;

cout<<"2. Song Title"<<endl;

cout<<"3. Song length"<<endl;

cout<<"4. Song format"<<endl;

cout<<">> ";

cin>>option;

switch(option)

{

case 1:

cout<<"Enter the new artist name: ";

cin>>name;

s[i].artistName=name;

break;

case 2:

cout<<"Enter the new title name: ";

cin>>name;

s[i].songTitle=name;

break;

case 3:

cout<<"Enter the new length: ";

cin>>option;

s[i].length = option;

break;

case 4:

cout<<"Enter the new audio format(MP3/WAV): ";

cin>>name;

if(name.compare("MP3"))

s[count].value=MP3;

else

s[count].value=WAV;

break;

}

break;

}

Sample Text file: topsong.txt

Katy_Perry Dark_Horse 240 MP3

Susan_Boyle Tik_Tok 201 WAV

Susan_Boyle I_Dreamed_a_Dream 109 WAV

Lady_Gaga Applause 250 MP3

AR_Rehman Jai_Ho 300 WAV

Jang_Geun_Suk What_should_I_Do 320 WAV

Geun_Suk_Meon Let_Me_Cry 280 MP3

Gong_Won_Suk Magic_Drag 320 MP3

Milly_Kate Nature_Girl 200 WAV

Jang_Youn_Me Take_Me 314 MP3

Sample Output:

Songs List

Please select from the following menu choices:

1. Add a song

2. Delete a song

3. Print

4. Edit

5. Exit

Enter choice: 3

Artist Name Song Title Length Format

===============================================================================

AR_Rehman Jai_Ho 300 WAV

Geun_Suk_Meon Let_Me_Cry 280 MP3

Gong_Won_Suk Magic_Drag 320 MP3

Jang_Geun_Suk What_should_I_Do 320 WAV

Jang_Youn_Me Take_Me 314 MP3

Katy_Perry Dark_Horse 240 MP3

Lady_Gaga Applause 250 MP3

Milly_Kate Nature_Girl 200 WAV

Susan_Boyle I_Dreamed_a_Dream 109 WAV

Susan_Boyle Tik_Tok 201 WAV

Songs List

Please select from the following menu choices:

1. Add a song

2. Delete a song

3. Print

4. Edit

5. Exit

Enter choice: 4

Enter the title so that the record data can be modified.

Enter the title of song(Song_name): Tik_Tok

1. Artist Name

2. Song Title

3. Song length

4. Song format

>> 1

Enter the new artist name: Boyle_Susan

Songs List

Please select from the following menu choices:

1. Add a song

2. Delete a song

3. Print

4. Edit

5. Exit

Enter choice: 3

Artist Name Song Title Length Format

===============================================================================

AR_Rehman Jai_Ho 300 WAV

Boyle_Susan Tik_Tok 201 WAV

Geun_Suk_Meon Let_Me_Cry 280 MP3

Gong_Won_Suk Magic_Drag 320 MP3

Jang_Geun_Suk What_should_I_Do 320 WAV

Jang_Youn_Me Take_Me 314 MP3

Katy_Perry Dark_Horse 240 MP3

Lady_Gaga Applause 250 MP3

Milly_Kate Nature_Girl 200 WAV

Susan_Boyle I_Dreamed_a_Dream 109 WAV

Songs List

Please select from the following menu choices:

1. Add a song

2. Delete a song

3. Print

4. Edit

5. Exit

Enter choice: 1

Enter the name of the artist(Fname_Lname): Park_Shiny

Enter the title of the song: Love_Will_Heal

Enter the length of the song: 280

Enter the song audio format(MP3/WAV): MP3

Songs List

Please select from the following menu choices:

1. Add a song

2. Delete a song

3. Print

4. Edit

5. Exit

Enter choice: 3

Artist Name Song Title Length Format

===============================================================================

AR_Rehman Jai_Ho 300 WAV

Boyle_Susan Tik_Tok 201 WAV

Geun_Suk_Meon Let_Me_Cry 280 MP3

Gong_Won_Suk Magic_Drag 320 MP3

Jang_Geun_Suk What_should_I_Do 320 WAV

Jang_Youn_Me Take_Me 314 MP3

Katy_Perry Dark_Horse 240 MP3

Lady_Gaga Applause 250 MP3

Milly_Kate Nature_Girl 200 WAV

Park_Shiny Love_Will_Heal 280 MP3

Susan_Boyle I_Dreamed_a_Dream 109 WAV

Songs List

Please select from the following menu choices:

1. Add a song

2. Delete a song

3. Print

4. Edit

5. Exit

Enter choice: 5

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