Hello, this is for an intro C++ class. We are using Visual Studio 2013--- file-n

Question

Hello, this is for an intro C++ class. We are using Visual Studio 2013--- file-newproject- Win32ConsoleApplication- and writing code on the source files that we compile and then start without debugging which our professor calls printing to screen---- this s where the menu below should display. Please go easy on a newbie/Any help s appreciated, Thanks. Write a code that creates a database of MP3 audio file information. (Create a useable user interface that allows the user to): A) Input data into each file entry B) Modify a file entry C) Print out the entire database of MP3 files D)You must also have options to save and retrieve the database from a text file. So a menu MIGHT look like this: 1. Add MP3 2. Print out MP3 list 3. Modify MP3 entry 4. Save List 5. Retrieve List 6. Quit program

Explanation / Answer

#include <iostream>
#include <string>
#include <fstream>

using namespace std;

void printMenu(){
   cout << "1. Add MP3" << endl;
   cout << "2. Print out MP3 list" << endl;
   cout << "3. Modify MP3 entry" << endl;
   cout << "4. Save List" << endl;
   cout << "5. Retrieve List" << endl;
   cout << "6. Quit Program" << endl;
}

void printList(string title[], string artist[], int play_length[], int count){
   for(int i = 0; i < count; ++i){
       cout << "Track " << (i + 1) << ": " << endl;
       cout << "Title: " << title[i] << endl;
       cout << "Artist: " << artist[i] << endl;
       cout << "Length: " << play_length[i] << endl;
   }
}

int getIndex(string title[], string t, int count){
   for(int i = 0; i < count; ++i){
       if(title[i] == t){
           return i;
       }
   }
   return -1;
}

void addEntry(string title[], string artist[], int play_length[], int index){
   cout << "Enter Title of the Track: ";
   getline(cin, title[index]);
   cout << "Enter Name of the artist: ";
   getline(cin, artist[index]);
   cout << "Enter play length of the track: ";
   cin >> play_length[index];
   string temp;
   getline(cin, temp);
}

void saveList(string title[], string artist[], int play_length[], int count){
   ofstream out;
   out.open("mp3list.txt");
   if(out.is_open()){
       for(int i = 0; i < count; ++i){
           out << i + 1 << endl;
           out << title[i] << endl;
           out << artist[i] << endl;
           out << play_length[i] << endl;
       }
       out.close();
   }
   else{
       cout << "Can not open mp3list.txt" << endl;
   }
}

void retrieveList(string title[], string artist[], int play_length[], int &count){
   ifstream in;
   in.open("mp3list.txt");
   int val;
   count = 0;
   string temp;
   if(in.is_open()){
       while(in >> val){
           getline(in, temp);
           getline(in, title[count]);
           getline(in, artist[count]);
           in >> play_length[count];
           getline(in, temp);
           count++;
       }
       in.close();
   }
   else{
       cout << "Can not open mp3list.txt" << endl;
   }
}

int main(){
   string title[50], temp;
   string artist[50];
   int play_length[50], option, count = 0, ind;
   while(true){
       printMenu();
       cout << "Choose an option: ";
       cin >> option;
       getline(cin, temp); // this extra cin after every cin is to skip past the character
       switch(option){
       case 1:
           addEntry(title, artist, play_length, count);
           count++;
           break;
       case 2:
           printList(title, artist, play_length, count);
           break;
       case 3:
           cout << "Enter title of the Track to modify: ";
           getline(cin, temp);
           ind = getIndex(title, temp, count);
           if(ind == -1){
               cout << temp << " not found" << endl;
           }
           else{
               addEntry(title, artist, play_length, ind);
           }
           break;
       case 4:
           saveList(title, artist, play_length, count);
           break;
       case 5:
           retrieveList(title, artist, play_length, count);
           break;
       case 6:
           return 0;
           break;
       default:
           cout << "Please choose a valid option!" << endl;
       }
       cout << endl;
   }
   return 0;
}

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