C++ || Dynamic Arrays – Create A Music Store Database Which Sorts CD Information & Display Grand Total

February 09, 2012 admin No comments

This program was presented as a homework assignment in a programming class to demonstrate the use of dynamic arrays, and pointer variables. The pointer variables which are displayed in this program are very excessive; and many are not needed, but it was good practice when trying to understand the logic behind it all.

REQUIRED KNOWLEDGE FOR THIS PROGRAM

Pointer Variables Dynamic Arrays 2-D Dynamic Arrays - How To Declare Bubble Sort While Loops For Loops Constant Variables Functions Switch Statements Toupper Strcpy Strcmp

This is an interactive program, which simulates a database for a music store, in which the user inputs data into the program (artist, CD title, genre, sales price, tax) and stores that information into multiple dynamic arrays (2-D and/or one dimensional dynamic arrays). The program will also apply any discounts that may currently be available for the selected CD genre, and applies that discount to the current CD information. When the user chooses to quit, the program will sort any data which is currently stored inside the array (by artist) in ascending order, and output the subtotal, tax applied, and grand total for all of the CD information which is entered into the array to the user.

After the program is complete, it will display a summary of the data which was stored into the array like so:

                                My Programming Notes Record Company
                                    Sales Report for 2/9/2012

Artist        Title   SalesPrice        Genre        DiscountRate     SubTotal      SalesTax   GrandTotal
Name1            CD1        12.99        Jazz         18.00%          10.65            1.26      11.91
Name2            CD2        12.99        Rap           7.00%          12.08            1.26      13.34

--------------------------------------------------------------------------------------------------------
Total (2 transactions)                                                  22.73           2.52    25.25

My Programming Notes Record Company

Sales Report for 2/9/2012

Artist Title SalesPrice Genre DiscountRate SubTotal SalesTax GrandTotal

Name1 CD1 12.99 Jazz 18.00% 10.65 1.26 11.91

Name2 CD2 12.99 Rap 7.00% 12.08 1.26 13.34

--------------------------------------------------------------------------------------------------------

Total (2 transactions) 22.73 2.52 25.25

NOTE: On some compilers, you may have to add #include < cstdlib> and #include < cstring> in order for the code to compile.





		
		
			Music Store Database
			
C++
			
			// =============================================================================
// This is an interactive program, which simulates a database for a music store 
// in which the user inputs data into the program (atrist, CD title, genre, 
// sales price, tax) and stores the data into a dynamic array. The program will 
// also apply any discounts that may currently be available to the selected CD 
// genre, and applies that   discount to the current CD. When the user choses 
// to quit, the program will  sort any data that is stored inside the array 
// (by artist) in ascending order and it will output the subtotal, tax applied, 
// and grand total for all of the CD information which is entered into the array
// =============================================================================
#include <iostream>
#include <iomanip>
#include <string>
#include <ctime>
using namespace std;

// function prototypes
double* GetDiscounts();
void DisplayMenu();
void GetCDInfo(char** &artist, char** &CDTitle, char** &genre,double* &salesPrice, double* &taxRate, int* numItems);
void GetDiscountRate(double* salesPrice,char** musicGenre, char** genre,int* numItems, double* &discountPercent,double* discountRate);
void GetSubTotal(double* salesPrice, double* discountRate, int* numItems,double* subTotal);
void GetTaxAmount(double* salesPrice, double* taxRate, int*numItems,double* salesTax);
void GetGrandTotal(double* subTotal,double* salesTax,int* numItems,double* grandTotal);
void SortData(char**artist, char**CDTitle, double*salesPrice, char**genre,double*discountPercent, double*subTotal, double*salesTax,  double*grandTotal, int* numItems);
void DisplayData(char**artist, char**CDTitle, double*salesPrice, char**genre,double*discountPercent, double*subTotal, double*salesTax, double*grandTotal, int* numItems);

// constant discount values 
// these values are defines within the
// 'GetDiscounts' function
const double* discounts = GetDiscounts();

// =============================================================================
// main
// =============================================================================
int main()
{
	//-- Declare Variables START ---//
	// numItems for artist array
	int* numItems = new int(0);

	// 2-D Dynamic array for music genres
	char** musicGenre = new char*[7];
	for(int index=0; index < 7; ++index)
	{musicGenre[index] = new char[13];}
	musicGenre[0]= "Classical";
	musicGenre[1]= "Country";
	musicGenre[2]= "International";
	musicGenre[3]= "Jazz";
	musicGenre[4]= "Pop";
	musicGenre[5]= "Rock";
	musicGenre[6]= "Rap";

	// 2-D Dynamic Array for artist name
	char** artist = new char*[50];
	for(int index=0; index < 50; ++index)
	{artist[index] = new char[20];}

	// 2-D Dynamic array for CD titles
	char** CDTitle = new char*[50];
	for(int index=0; index < 50; ++index)
	{CDTitle[index] = new char[20];}

	// 2-D Dynamic array of music genre
	char** genre = new char*[50];
	for(int index=0; index < 50; ++index)
	{genre[index] = new char[20];}

	// array for list price
	double* salesPrice = new double[20];

	// array for tax rate
	double* taxRate = new double[20];

	// array for discount amount
	double* discountRate= new double[20];

	// array for sales price
	double* subTotal = new double[20];

	// array for taxamount
	double* salesTax= new double[20];

	// array for grandTotal
	double* grandTotal = new double[20];

	// array for discount percent
	double* discountPercent = new double[20];

	// variable for the while loop menu 
	char* userInput = new char('n');

	// variable if the user wants to enter more data
	char* enterMoreData = new char('y');

	//-- Declare Variables END ---//

	// display menu
	DisplayMenu();
	cin >> userInput;

	// loop thru menu options
	while((toupper(*userInput) !='Q'))
	{
		switch(toupper(*userInput))
		{
		case 'E':
			// get artist info
			GetCDInfo(artist, CDTitle, genre, salesPrice, taxRate, numItems);
			// get discount
			GetDiscountRate(salesPrice, musicGenre, genre, numItems,discountPercent, discountRate);
			// get sub total
			GetSubTotal(salesPrice, discountRate, numItems,subTotal);
			// get tax amount
			GetTaxAmount(salesPrice, taxRate, numItems,salesTax);
			// get cash price
			GetGrandTotal(subTotal, salesTax, numItems,grandTotal);
			// ask if they want to enter more data
			cout << "nDo you want to enter more CD's? (y/n): ";
			cin >> *enterMoreData;
			if(toupper(*enterMoreData)=='Y')
			{
				(++*numItems);
			}
			else
			{
				(++*numItems);
				*userInput='q';
			}
			break;
		case 'D':
			DisplayData(artist, CDTitle, salesPrice, genre, discountPercent,subTotal,salesTax, grandTotal, numItems);
			break;
		default:
			cout<<"nYou have selected an invalid command";
			break;
		}
		//creates a line separator
		cout<<endl;
		cout<<setfill('-');
		cout<<left<<setw(30)<<""<<right<<setw(30)<<""<<endl; 

		// if user wants to enter more data, display menu to screen
		if(toupper(*enterMoreData)=='Y')
		{
			DisplayMenu();
			cin >> userInput;
		}
	}// end of while loop
	// sort the current data inside the array
	SortData(artist, CDTitle, salesPrice, genre, discountPercent,subTotal,salesTax, grandTotal, numItems);

	// display the current data inside the array
	DisplayData(artist, CDTitle, salesPrice, genre, discountPercent,subTotal,salesTax, grandTotal, numItems);

	return 0;
}// End of Main

// =============================================================================
// DisplayMenu
// displays the menu to the user
// =============================================================================
void DisplayMenu()
{
	cout<<"Welcome to the CD Management System!";
	cout<<"nFrom the following menu, select an option";
	cout<<"nnE - Enter new CD information into the database";
	cout<<"nD - Display the current information in the database";
	cout<<"nQ - Quit";
	cout<<"nn>> ";
}// End of DisplayMenu

// =============================================================================
// DisplayData
// displays the current contents in the array. If there is nothing in the array
// the program promts a message to the user
// =============================================================================
void DisplayData(char**artist, char**CDTitle, double*salesPrice, char**genre,
			  double*discountPercent, double*subTotal, double*salesTax, 
			  double*grandTotal, int* numItems)
{
	double* totSalePrice = new double(0);
	double* totSalesTax = new double(0);
	double* totgrandTotal = new double(0);

	// variables which will get the current date
    time_t t = time(0);   // get current CPU time 
    struct tm * now = localtime(& t);

	// if array is empty, display message
	if(*numItems ==0)
	{
		cout<<"nThe database is currently empty!n";
	}
	else
	{
		// displays the company header to the user
		cout<<setfill(' ');
		cout << "nttttMy Programming Notes Record Company"
			<< "ntttt    Sales Report for "<<now->tm_mon + 1<<"/"<<now->tm_mday<<"/"<<now->tm_year + 1900<<"nn";

		// displays the categories which will be shown to the user
		cout <<setw(1)<<right<<"Artist"<<setw(13)<<"Title"<<setw(13)<<"SalesPrice"
			<<setw(13)<<"Genre"<<setw(20)<<"DiscountRate"<<setw(13)<<"SubTotal"
			<<setw(13)<<"SalesTax"<<setw(13)<<"GrandTotal";
	
		// displays the data which is currently inside the array's
		cout<<fixed<<setprecision(2);
		for(int* index = new int(0); *index < *numItems; ++*index)
		{
			cout << endl;
			cout <<setw(1)<<right<<artist[*index]<<setw(15)<<CDTitle[*index]
			<<setw(13)<<salesPrice[*index]<<setw(15)<<genre[*index]<<setw(13)
				<<discountPercent[*index]*100<<"%"<<setw(15)<<subTotal[*index]<<setw(16)
				<<salesTax[*index]<<setw(13)<<grandTotal[*index];
		}

		// finds the total prices for the entire list of CD's
		for(int* index = new int(0); *index < *numItems; ++*index)
		{
			*totSalePrice+= subTotal[*index];
			*totSalesTax+= salesTax[*index];
			*totgrandTotal+= grandTotal[*index];
		}

		// creates a line separator
		cout<<setfill('-');
		cout<<endl<<endl<<left<<setw(52)<<""<<right<<setw(52)<<""<<endl;

		// displays the total to the user
		cout<< "Total ("<<*numItems<<" transactions)ttttttt"
			<<*totSalePrice<<"tt"<<*totSalesTax<<"t"<<*totgrandTotal<<endl;
	}
}// End of DisplayData

// =============================================================================
// SortData
// sorts all the data which is currently present in the arrays via bubble sort
// this function does not display any data to the user
// =============================================================================
void SortData(char**artist, char**CDTitle, double*salesPrice, char**genre,double*discountPercent, double*subTotal, double*salesTax, 
			  double*grandTotal, int* numItems)
{
	// bool which will tell us if sorting is complete
	bool sorted = false;

	// temporary variables for sorting purposes only
	char* tempArtist = new char[20];
	char* tempCDTitle= new char[20];
	char* tempGenre= new char[20];
	double* tempListPrice= new double[20];
	double* tempDiscountPercent = new double[20];
	double* tempsubTotal = new double[20];
	double* tempTaxAmt = new double[20];
	double* tempgrandTotal = new double[20];
	
	// this is the bubble sort
	// which sorts the entries by artist in ascending order
	while (sorted==false)
	{
		sorted=true;
		for(int* index= new int(0); *index < *numItems-1; ++*index)
		{
			// checks the artist to see if they are in the correct order
			if (strcmp(artist[*index],artist[*index+1]) > 0)
			{
				// swaps artist places
				strcpy(tempArtist, artist[*index]);
				strcpy(artist[*index], artist[*index+1]);
				strcpy(artist[*index+1], tempArtist);

				// swaps CD title 
				strcpy(tempCDTitle, CDTitle[*index]);
				strcpy(CDTitle[*index], CDTitle[*index+1]);
				strcpy(CDTitle[*index+1], tempCDTitle);
				
				// swaps music genre
				strcpy(tempGenre, genre[*index]);
				strcpy(genre[*index], genre[*index+1]);
				strcpy(genre[*index+1], tempGenre);
				
				// swaps the CD price
				*tempgrandTotal = grandTotal[*index];
				grandTotal[*index] = grandTotal[*index+1];
				grandTotal[*index+1] = *tempgrandTotal;
				
				// swaps the tax amount
				*tempTaxAmt = salesTax[*index];
				salesTax[*index] = salesTax[*index+1];
				salesTax[*index+1] = *tempTaxAmt;
				
				// swaps the sales price
				*tempsubTotal = subTotal[*index];
				subTotal[*index] = subTotal[*index+1];
				subTotal[*index+1] = *tempsubTotal;
				
				// swaps the discount percent
				*tempDiscountPercent = discountPercent[*index];
				discountPercent[*index] = discountPercent[*index+1];
				discountPercent[*index+1] = *tempDiscountPercent;
				
				// swaps the list price
				*tempListPrice = salesPrice[*index];
				salesPrice[*index] = salesPrice[*index+1];
				salesPrice[*index+1] = *tempListPrice;

				// sets the 'sorted' variable to false
				sorted=false;
			}// end of if statement
		}// end for loop
	}// end while loop
}// End of SortData

// =============================================================================
// GetGrandTotal
// calculates the grand total for the current transaction
// =============================================================================
void GetGrandTotal(double* subTotal,double* salesTax,int* numItems,double* grandTotal)
{
	grandTotal[*numItems]= (subTotal[*numItems])+(salesTax[*numItems]);

}// End of GetgrandTotal

// =============================================================================
// GetTaxAmount
// calculates the sales tax for the current transaction
// =============================================================================
void GetTaxAmount(double* salesPrice, double* taxRate, int*numItems,double* salesTax)
{
	salesTax[*numItems] = (salesPrice[*numItems])* (taxRate[*numItems]);
}// End of GetTaxAmount

// =============================================================================
// GetSubTotal
// gets the subtotal for the current transaction
// =============================================================================
void GetSubTotal(double* salesPrice, double* discountRate, int* numItems,double* subTotal)
{
	subTotal[*numItems] = (salesPrice[*numItems]) - (discountRate[*numItems]);
}// End of GetsubTotal

// =============================================================================
// GetDiscountRate
// gets the discount rate for the currently selected CD
// =============================================================================
void GetDiscountRate(double* salesPrice,char** musicGenre, char** genre,int* numItems, double* &discountPercent, double* discountRate)
{
	// comapres the user inputted current genre to the pre-defined
	// genres as defined in the main function, then assigns a 
	// discount to the current CD
	if(strcmp(genre[*numItems],musicGenre[0]) == 0) // if music genre is Classical
	{discountPercent[*numItems] = discounts[0];}
	else if(strcmp(genre[*numItems],musicGenre[1]) == 0) // if music genre is Country
	{discountPercent[*numItems] = discounts[1];}
	else if(strcmp(genre[*numItems],musicGenre[2]) == 0) // if music genre is International
	{discountPercent[*numItems] = discounts[2];}
	else if(strcmp(genre[*numItems],musicGenre[3]) == 0) // if music genre is Jazz
	{discountPercent[*numItems] = discounts[3];}
	else if(strcmp(genre[*numItems],musicGenre[4]) == 0) // if music genre is Pop
	{discountPercent[*numItems] = discounts[4];}
	else if(strcmp(genre[*numItems],musicGenre[5]) == 0) // if music genre is Rock
	{discountPercent[*numItems] = discounts[5];}
	else if(strcmp(genre[*numItems],musicGenre[6]) == 0) // if music genre is Rap
	{discountPercent[*numItems] = discounts[6];}
	else{discountPercent[*numItems] = discounts[4];} // if music genre is not any of these ^, then there is no discount
	
	// assign the discount rate to the current CD
	discountRate[*numItems] = (discountPercent[*numItems]) * (salesPrice[*numItems]);
}// End of GetDiscountRate

// =============================================================================
// GetCDInfo
// obtains the CD information from the user
// =============================================================================
void GetCDInfo(char** &artist, char** &CDTitle, char** &genre, 
			 double* &salesPrice, double* &taxRate, int* numItems)
{
	cin.ignore();
	cout << "nEnter the name of the artist: ";
	cin.getline(artist[*numItems],50, 'n');
	cout << "nEnter the title of the CD: ";
	cin.getline(CDTitle[*numItems],50, 'n');
	cout << "nEnter the genre: ";
	cin.getline(genre[*numItems], 20);
	cout << "nEnter the sales price $";
	cin >> salesPrice[*numItems];
	cout << "nEnter the sales tax: ";
	cin >> taxRate[*numItems];
}// End of GetInfo

// =============================================================================
// GetDiscounts
// returns the discount rate for the selected genre
// =============================================================================
double* GetDiscounts()
{
	double* temp =  new double[7];
	temp[0] = .09; // discount rate for Classical
	temp[1] = .03; // discount rate for Country
	temp[2] = .11; // discount rate for International
	temp[3] = .18; // discount rate for Jazz
	temp[4] = .00; // discount rate for Pop
	temp[5] = .10; // discount rate for Rock
	temp[6] = .07; // discount rate for Rap
	return temp;
}// http://programmingnotes.org/
			
				
					
				
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						// =============================================================================
// This is an interactive program, which simulates a database for a music store 
// in which the user inputs data into the program (atrist, CD title, genre, 
// sales price, tax) and stores the data into a dynamic array. The program will 
// also apply any discounts that may currently be available to the selected CD 
// genre, and applies that   discount to the current CD. When the user choses 
// to quit, the program will  sort any data that is stored inside the array 
// (by artist) in ascending order and it will output the subtotal, tax applied, 
// and grand total for all of the CD information which is entered into the array
// =============================================================================
#include <iostream>
#include <iomanip>
#include <string>
#include <ctime>
using namespace std;
 
// function prototypes
double* GetDiscounts();
void DisplayMenu();
void GetCDInfo(char** &artist, char** &CDTitle, char** &genre,double* &salesPrice, double* &taxRate, int* numItems);
void GetDiscountRate(double* salesPrice,char** musicGenre, char** genre,int* numItems, double* &discountPercent,double* discountRate);
void GetSubTotal(double* salesPrice, double* discountRate, int* numItems,double* subTotal);
void GetTaxAmount(double* salesPrice, double* taxRate, int*numItems,double* salesTax);
void GetGrandTotal(double* subTotal,double* salesTax,int* numItems,double* grandTotal);
void SortData(char**artist, char**CDTitle, double*salesPrice, char**genre,double*discountPercent, double*subTotal, double*salesTax,  double*grandTotal, int* numItems);
void DisplayData(char**artist, char**CDTitle, double*salesPrice, char**genre,double*discountPercent, double*subTotal, double*salesTax, double*grandTotal, int* numItems);
 
// constant discount values 
// these values are defines within the
// 'GetDiscounts' function
const double* discounts = GetDiscounts();
 
// =============================================================================
// main
// =============================================================================
int main()
{
	//-- Declare Variables START ---//
	// numItems for artist array
	int* numItems = new int(0);
 
	// 2-D Dynamic array for music genres
	char** musicGenre = new char*[7];
	for(int index=0; index < 7; ++index)
	{musicGenre[index] = new char[13];}
	musicGenre[0]= "Classical";
	musicGenre[1]= "Country";
	musicGenre[2]= "International";
	musicGenre[3]= "Jazz";
	musicGenre[4]= "Pop";
	musicGenre[5]= "Rock";
	musicGenre[6]= "Rap";
 
	// 2-D Dynamic Array for artist name
	char** artist = new char*[50];
	for(int index=0; index < 50; ++index)
	{artist[index] = new char[20];}
 
	// 2-D Dynamic array for CD titles
	char** CDTitle = new char*[50];
	for(int index=0; index < 50; ++index)
	{CDTitle[index] = new char[20];}
 
	// 2-D Dynamic array of music genre
	char** genre = new char*[50];
	for(int index=0; index < 50; ++index)
	{genre[index] = new char[20];}
 
	// array for list price
	double* salesPrice = new double[20];
 
	// array for tax rate
	double* taxRate = new double[20];
 
	// array for discount amount
	double* discountRate= new double[20];
 
	// array for sales price
	double* subTotal = new double[20];
 
	// array for taxamount
	double* salesTax= new double[20];
 
	// array for grandTotal
	double* grandTotal = new double[20];
 
	// array for discount percent
	double* discountPercent = new double[20];
 
	// variable for the while loop menu 
	char* userInput = new char('n');
 
	// variable if the user wants to enter more data
	char* enterMoreData = new char('y');
 
	//-- Declare Variables END ---//
 
	// display menu
	DisplayMenu();
	cin >> userInput;
 
	// loop thru menu options
	while((toupper(*userInput) !='Q'))
	{
		switch(toupper(*userInput))
		{
		case 'E':
			// get artist info
			GetCDInfo(artist, CDTitle, genre, salesPrice, taxRate, numItems);
			// get discount
			GetDiscountRate(salesPrice, musicGenre, genre, numItems,discountPercent, discountRate);
			// get sub total
			GetSubTotal(salesPrice, discountRate, numItems,subTotal);
			// get tax amount
			GetTaxAmount(salesPrice, taxRate, numItems,salesTax);
			// get cash price
			GetGrandTotal(subTotal, salesTax, numItems,grandTotal);
			// ask if they want to enter more data
			cout << "nDo you want to enter more CD's? (y/n): ";
			cin >> *enterMoreData;
			if(toupper(*enterMoreData)=='Y')
			{
				(++*numItems);
			}
			else
			{
				(++*numItems);
				*userInput='q';
			}
			break;
		case 'D':
			DisplayData(artist, CDTitle, salesPrice, genre, discountPercent,subTotal,salesTax, grandTotal, numItems);
			break;
		default:
			cout<<"nYou have selected an invalid command";
			break;
		}
		//creates a line separator
		cout<<endl;
		cout<<setfill('-');
		cout<<left<<setw(30)<<""<<right<<setw(30)<<""<<endl; 
 
		// if user wants to enter more data, display menu to screen
		if(toupper(*enterMoreData)=='Y')
		{
			DisplayMenu();
			cin >> userInput;
		}
	}// end of while loop
	// sort the current data inside the array
	SortData(artist, CDTitle, salesPrice, genre, discountPercent,subTotal,salesTax, grandTotal, numItems);
 
	// display the current data inside the array
	DisplayData(artist, CDTitle, salesPrice, genre, discountPercent,subTotal,salesTax, grandTotal, numItems);
 
	return 0;
}// End of Main
 
// =============================================================================
// DisplayMenu
// displays the menu to the user
// =============================================================================
void DisplayMenu()
{
	cout<<"Welcome to the CD Management System!";
	cout<<"nFrom the following menu, select an option";
	cout<<"nnE - Enter new CD information into the database";
	cout<<"nD - Display the current information in the database";
	cout<<"nQ - Quit";
	cout<<"nn>> ";
}// End of DisplayMenu
 
// =============================================================================
// DisplayData
// displays the current contents in the array. If there is nothing in the array
// the program promts a message to the user
// =============================================================================
void DisplayData(char**artist, char**CDTitle, double*salesPrice, char**genre,
			  double*discountPercent, double*subTotal, double*salesTax, 
			  double*grandTotal, int* numItems)
{
	double* totSalePrice = new double(0);
	double* totSalesTax = new double(0);
	double* totgrandTotal = new double(0);
 
	// variables which will get the current date
    time_t t = time(0);   // get current CPU time 
    struct tm * now = localtime(& t);
 
	// if array is empty, display message
	if(*numItems ==0)
	{
		cout<<"nThe database is currently empty!n";
	}
	else
	{
		// displays the company header to the user
		cout<<setfill(' ');
		cout << "nttttMy Programming Notes Record Company"
			<< "ntttt    Sales Report for "<<now->tm_mon + 1<<"/"<<now->tm_mday<<"/"<<now->tm_year + 1900<<"nn";
 
		// displays the categories which will be shown to the user
		cout <<setw(1)<<right<<"Artist"<<setw(13)<<"Title"<<setw(13)<<"SalesPrice"
			<<setw(13)<<"Genre"<<setw(20)<<"DiscountRate"<<setw(13)<<"SubTotal"
			<<setw(13)<<"SalesTax"<<setw(13)<<"GrandTotal";
	
		// displays the data which is currently inside the array's
		cout<<fixed<<setprecision(2);
		for(int* index = new int(0); *index < *numItems; ++*index)
		{
			cout << endl;
			cout <<setw(1)<<right<<artist[*index]<<setw(15)<<CDTitle[*index]
			<<setw(13)<<salesPrice[*index]<<setw(15)<<genre[*index]<<setw(13)
				<<discountPercent[*index]*100<<"%"<<setw(15)<<subTotal[*index]<<setw(16)
				<<salesTax[*index]<<setw(13)<<grandTotal[*index];
		}
 
		// finds the total prices for the entire list of CD's
		for(int* index = new int(0); *index < *numItems; ++*index)
		{
			*totSalePrice+= subTotal[*index];
			*totSalesTax+= salesTax[*index];
			*totgrandTotal+= grandTotal[*index];
		}
 
		// creates a line separator
		cout<<setfill('-');
		cout<<endl<<endl<<left<<setw(52)<<""<<right<<setw(52)<<""<<endl;
 
		// displays the total to the user
		cout<< "Total ("<<*numItems<<" transactions)ttttttt"
			<<*totSalePrice<<"tt"<<*totSalesTax<<"t"<<*totgrandTotal<<endl;
	}
}// End of DisplayData
 
// =============================================================================
// SortData
// sorts all the data which is currently present in the arrays via bubble sort
// this function does not display any data to the user
// =============================================================================
void SortData(char**artist, char**CDTitle, double*salesPrice, char**genre,double*discountPercent, double*subTotal, double*salesTax, 
			  double*grandTotal, int* numItems)
{
	// bool which will tell us if sorting is complete
	bool sorted = false;
 
	// temporary variables for sorting purposes only
	char* tempArtist = new char[20];
	char* tempCDTitle= new char[20];
	char* tempGenre= new char[20];
	double* tempListPrice= new double[20];
	double* tempDiscountPercent = new double[20];
	double* tempsubTotal = new double[20];
	double* tempTaxAmt = new double[20];
	double* tempgrandTotal = new double[20];
	
	// this is the bubble sort
	// which sorts the entries by artist in ascending order
	while (sorted==false)
	{
		sorted=true;
		for(int* index= new int(0); *index < *numItems-1; ++*index)
		{
			// checks the artist to see if they are in the correct order
			if (strcmp(artist[*index],artist[*index+1]) > 0)
			{
				// swaps artist places
				strcpy(tempArtist, artist[*index]);
				strcpy(artist[*index], artist[*index+1]);
				strcpy(artist[*index+1], tempArtist);
 
				// swaps CD title 
				strcpy(tempCDTitle, CDTitle[*index]);
				strcpy(CDTitle[*index], CDTitle[*index+1]);
				strcpy(CDTitle[*index+1], tempCDTitle);
				
				// swaps music genre
				strcpy(tempGenre, genre[*index]);
				strcpy(genre[*index], genre[*index+1]);
				strcpy(genre[*index+1], tempGenre);
				
				// swaps the CD price
				*tempgrandTotal = grandTotal[*index];
				grandTotal[*index] = grandTotal[*index+1];
				grandTotal[*index+1] = *tempgrandTotal;
				
				// swaps the tax amount
				*tempTaxAmt = salesTax[*index];
				salesTax[*index] = salesTax[*index+1];
				salesTax[*index+1] = *tempTaxAmt;
				
				// swaps the sales price
				*tempsubTotal = subTotal[*index];
				subTotal[*index] = subTotal[*index+1];
				subTotal[*index+1] = *tempsubTotal;
				
				// swaps the discount percent
				*tempDiscountPercent = discountPercent[*index];
				discountPercent[*index] = discountPercent[*index+1];
				discountPercent[*index+1] = *tempDiscountPercent;
				
				// swaps the list price
				*tempListPrice = salesPrice[*index];
				salesPrice[*index] = salesPrice[*index+1];
				salesPrice[*index+1] = *tempListPrice;
 
				// sets the 'sorted' variable to false
				sorted=false;
			}// end of if statement
		}// end for loop
	}// end while loop
}// End of SortData
 
// =============================================================================
// GetGrandTotal
// calculates the grand total for the current transaction
// =============================================================================
void GetGrandTotal(double* subTotal,double* salesTax,int* numItems,double* grandTotal)
{
	grandTotal[*numItems]= (subTotal[*numItems])+(salesTax[*numItems]);
 
}// End of GetgrandTotal
 
// =============================================================================
// GetTaxAmount
// calculates the sales tax for the current transaction
// =============================================================================
void GetTaxAmount(double* salesPrice, double* taxRate, int*numItems,double* salesTax)
{
	salesTax[*numItems] = (salesPrice[*numItems])* (taxRate[*numItems]);
}// End of GetTaxAmount
 
// =============================================================================
// GetSubTotal
// gets the subtotal for the current transaction
// =============================================================================
void GetSubTotal(double* salesPrice, double* discountRate, int* numItems,double* subTotal)
{
	subTotal[*numItems] = (salesPrice[*numItems]) - (discountRate[*numItems]);
}// End of GetsubTotal
 
// =============================================================================
// GetDiscountRate
// gets the discount rate for the currently selected CD
// =============================================================================
void GetDiscountRate(double* salesPrice,char** musicGenre, char** genre,int* numItems, double* &discountPercent, double* discountRate)
{
	// comapres the user inputted current genre to the pre-defined
	// genres as defined in the main function, then assigns a 
	// discount to the current CD
	if(strcmp(genre[*numItems],musicGenre[0]) == 0) // if music genre is Classical
	{discountPercent[*numItems] = discounts[0];}
	else if(strcmp(genre[*numItems],musicGenre[1]) == 0) // if music genre is Country
	{discountPercent[*numItems] = discounts[1];}
	else if(strcmp(genre[*numItems],musicGenre[2]) == 0) // if music genre is International
	{discountPercent[*numItems] = discounts[2];}
	else if(strcmp(genre[*numItems],musicGenre[3]) == 0) // if music genre is Jazz
	{discountPercent[*numItems] = discounts[3];}
	else if(strcmp(genre[*numItems],musicGenre[4]) == 0) // if music genre is Pop
	{discountPercent[*numItems] = discounts[4];}
	else if(strcmp(genre[*numItems],musicGenre[5]) == 0) // if music genre is Rock
	{discountPercent[*numItems] = discounts[5];}
	else if(strcmp(genre[*numItems],musicGenre[6]) == 0) // if music genre is Rap
	{discountPercent[*numItems] = discounts[6];}
	else{discountPercent[*numItems] = discounts[4];} // if music genre is not any of these ^, then there is no discount
	
	// assign the discount rate to the current CD
	discountRate[*numItems] = (discountPercent[*numItems]) * (salesPrice[*numItems]);
}// End of GetDiscountRate
 
// =============================================================================
// GetCDInfo
// obtains the CD information from the user
// =============================================================================
void GetCDInfo(char** &artist, char** &CDTitle, char** &genre, 
			 double* &salesPrice, double* &taxRate, int* numItems)
{
	cin.ignore();
	cout << "nEnter the name of the artist: ";
	cin.getline(artist[*numItems],50, 'n');
	cout << "nEnter the title of the CD: ";
	cin.getline(CDTitle[*numItems],50, 'n');
	cout << "nEnter the genre: ";
	cin.getline(genre[*numItems], 20);
	cout << "nEnter the sales price $";
	cin >> salesPrice[*numItems];
	cout << "nEnter the sales tax: ";
	cin >> taxRate[*numItems];
}// End of GetInfo
 
// =============================================================================
// GetDiscounts
// returns the discount rate for the selected genre
// =============================================================================
double* GetDiscounts()
{
	double* temp =  new double[7];
	temp[0] = .09; // discount rate for Classical
	temp[1] = .03; // discount rate for Country
	temp[2] = .11; // discount rate for International
	temp[3] = .18; // discount rate for Jazz
	temp[4] = .00; // discount rate for Pop
	temp[5] = .10; // discount rate for Rock
	temp[6] = .07; // discount rate for Rap
	return temp;
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Once compiled, you should get this as your output

Welcome to the CD Management System! From the following menu, select an option
E - Enter new CD information into the database D - Display the current information in the database Q - Quit >> e Enter the name of the artist: Nm8 Enter the title of the CD: CD8 Enter the genre: Rock Enter the sales price $12.99 Enter the sales tax: .098 Do you want to enter more CD's? (y/n): y ------------------------------------------------------------ Welcome to the CD Management System! From the following menu, select an option E - Enter new CD information into the database D - Display the current information in the database Q - Quit >> e Enter the name of the artist: Nm7 Enter the title of the CD: CD7 Enter the genre: Country Enter the sales price $10.99 Enter the sales tax: .078 Do you want to enter more CD's? (y/n): y ------------------------------------------------------------ Welcome to the CD Management System! From the following menu, select an option E - Enter new CD information into the database D - Display the current information in the database Q - Quit >> e Enter the name of the artist: Nm6 Enter the title of the CD: CD6 Enter the genre: Pop Enter the sales price $11.50 Enter the sales tax: .067 Do you want to enter more CD's? (y/n): y ------------------------------------------------------------ Welcome to the CD Management System! From the following menu, select an option E - Enter new CD information into the database D - Display the current information in the database Q - Quit >> e Enter the name of the artist: Nm5 Enter the title of the CD: CD5 Enter the genre: Jazz Enter the sales price $12.24 Enter the sales tax: .045 Do you want to enter more CD's? (y/n): y ------------------------------------------------------------ Welcome to the CD Management System! From the following menu, select an option E - Enter new CD information into the database D - Display the current information in the database Q - Quit >> e Enter the name of the artist: Nm4 Enter the title of the CD: CD4 Enter the genre: Other Enter the sales price $12.99 Enter the sales tax: .094 Do you want to enter more CD's? (y/n): y ------------------------------------------------------------ Welcome to the CD Management System! From the following menu, select an option E - Enter new CD information into the database D - Display the current information in the database Q - Quit >> e Enter the name of the artist: Nm3 Enter the title of the CD: CD3 Enter the genre: Classical Enter the sales price $11.45 Enter the sales tax: .078 Do you want to enter more CD's? (y/n): y ------------------------------------------------------------ Welcome to the CD Management System! From the following menu, select an option E - Enter new CD information into the database D - Display the current information in the database Q - Quit >> e Enter the name of the artist: Nm2 Enter the title of the CD: CD2 Enter the genre: International Enter the sales price $10.99 Enter the sales tax: .093 Do you want to enter more CD's? (y/n): y ------------------------------------------------------------ Welcome to the CD Management System! From the following menu, select an option E - Enter new CD information into the database D - Display the current information in the database Q - Quit >> e
Enter the name of the artist: Nm1 Enter the title of the CD: CD1 Enter the genre: Rap Enter the sales price $12.99 Enter the sales tax: .0975 Do you want to enter more CD's? (y/n): n

                                My Programming Notes Record Company
                                    Sales Report for 2/9/2012

Artist        Title   SalesPrice        Genre        DiscountRate     SubTotal      SalesTax   GrandTotal
Nm1            CD1        12.99            Rap         7.00%          12.08            1.27        13.35
Nm2            CD2        10.99  International        11.00%           9.78            1.02        10.80
Nm3            CD3        11.45      Classical         9.00%          10.42            0.89        11.31
Nm4            CD4        12.99          Other         0.00%          12.99            1.22        14.21
Nm5            CD5        12.24           Jazz        18.00%          10.04            0.55        10.59
Nm6            CD6        11.50            Pop         0.00%          11.50            0.77        12.27
Nm7            CD7        10.99        Country         3.00%          10.66            0.86        11.52
Nm8            CD8        12.99           Rock        10.00%          11.69            1.27        12.96

--------------------------------------------------------------------------------------------------------
Total (8 transactions)                                                  89.16           7.85    97.01

My Programming Notes Record Company

Sales Report for 2/9/2012

Artist Title SalesPrice Genre DiscountRate SubTotal SalesTax GrandTotal

Nm1 CD1 12.99 Rap 7.00% 12.08 1.27 13.35

Nm2 CD2 10.99 International 11.00% 9.78 1.02 10.80

Nm3 CD3 11.45 Classical 9.00% 10.42 0.89 11.31

Nm4 CD4 12.99 Other 0.00% 12.99 1.22 14.21

Nm5 CD5 12.24 Jazz 18.00% 10.04 0.55 10.59

Nm6 CD6 11.50 Pop 0.00% 11.50 0.77 12.27

Nm7 CD7 10.99 Country 3.00% 10.66 0.86 11.52

Nm8 CD8 12.99 Rock 10.00% 11.69 1.27 12.96

--------------------------------------------------------------------------------------------------------

Total (8 transactions) 89.16 7.85 97.01

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Posted in: Advanced, C++ Tags: 2-D, array, c++, dynamic, for loop, if/else, Output, While Loop

C++ || Dynamic Arrays – Create A Music Store Database Which Sorts CD Information & Display Grand Total

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