Question

Files, Pointers and Dynamic Memory Allocation, and Structs

Due date/time: Tuesday, Nov 26^th, 11:00 PM.

WRITE A C++ PROGRAM (USE DYNAMIC MEMORY ALLOCATION) THAT READS N CUSTOMER RECORDS FROM A TEXT FILE (CUSTOMERS.TXT) SUCH THAT THE NUMBER OF THE RECORDS IS STORED ON THE FIRST LINE IN THE FILE. EACH RECORD HAS 4 FIELDS (PIECES OF INFORMATION) AND STORED IN THE FILE AS SHOWN BELOW:

Account Number (integer)

Customer full name (string)

Customer email (string)

Account Balance (double)

The program is expected to print the records in the format shown below, sorted in decreasing order based on the account balance:

Account Number : 1201077

Name                     : Jonathan I. Maletic

Email                     : [email protected]

Balance                   : 10,000.17

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

Note: The records stored in the following format (4 lines for each account):

First Line is the account number

Second Line is full name

Third line is an email

Forth line is the available balance

Important Note: You must use 4 dynamic arrays (one for each field) to store all the records (information) read from the file. Then sort the arrays and then print it. The program should open the files and read the first token and use it size for the dynamic array.

Example (data saved in the text file)

Output:

3 1201077 Jonathan I. Maletic [email protected] 10,000.17 1991999 Aziz . s. fuways [email protected] 5,000.11 1333333 Bill Bultman [email protected] 120,000.00

Account Number : 1333333 Name           : Bill Bultman Email          : [email protected] Balance        : 120,000.00 ------------------------------------- Account Number : 1201077 Name           : Jonathan I. Maletic Email          : [email protected] Balance        : 10,000.17 ------------------------------------- Account Number : 1991999 Name           : aziz . s. fuways Email          : [email protected] Balance        : 5,000.11 -------------------------------------

                                                                                                               

• Make sure your programs adhere to proper programming style (e.g., good identifiers, comments, etc.). Post your questions on Piazza for a prompt response.
• Please submit the two programs to the same dropbox on Canvas.
• Please take a look at the example posted on Piazza and use it as a model.

Answer 1

Screenshot of the code:

Code to copy:

// Include the necessary header files

#include <iostream>

#include <cstdlib>

#include <iomanip>

#include <fstream>

using namespace std;

// Define the main() function

int main()

{

// Declare the necessary dynamic arrays for each field

int *account_number;

string *full_name, *customer_email;

double *balance;

// Create an ifstream object

ifstream infile;

// Open the input file Customers.txt

infile.open("Customers.txt");

// Check if the file exists

if(!infile)

{

// Display the file does not exist

cout<<"The input file is not found!!"<<endl;

// Terminate the program

exit(0);

}

// Set precision for decimal value to two

cout << setprecision(2) << fixed;

// Declare an int variable to store the number of records

// in the file

int num_records = 0;

// Read the first line of the file, and store the

// value to the variable declared

infile>>num_records;

// Dynamically allocate memory for each array

account_number = new int[num_records];

full_name = new string[num_records];

customer_email = new string[num_records];

balance = new double[num_records];

// Declare an int variable, and initialize it to

// zero

int x = 0;

// Ignore '\n' character from file stream

infile.ignore();

// Loop till the end of the file

while(!infile.eof())

{

// Read the account number from the file, and store the

// value to the account_number array

infile>>account_number[x];

// Ignore '\n' character from file istream

infile.ignore();

// Read the full name from the file, and store the value

// to full_name array

getline(infile, full_name[x]);

// Read the email id from the file, and store the value

// to customer_email array

infile>>customer_email[x];

// Read the balance from the file, and store the value

// to balance array

infile>>balance[x];

// Increment the value of x

x++;

}

// Loop to sort the array in descending order, based on the

// values stored in the balance array

for(x = 0; x < num_records; x++)

{

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

{

// Check if the value at index x is greater than the

// value at index i

if(balance[x] > balance[i])

{

/* Sorting balance array */

// Declare a temporary double varaible, and assign the

// value at index x to the variable

double temp_bal = balance[x];

// Assign the value at index i to index x

balance[x] = balance[i];

// Assign the value in temp_bal variable to index i

balance[i] = temp_bal;

/* Sorting account number array */

// Declare a temporary string varaible, and assign the

// value at index x to the variable

int temp_num = account_number[x];

// Assign the value at index i to index x

account_number[x] = account_number[i];

// Assign the value in temp_num variable to index i

account_number[i] = temp_num;

/* Sorting name array */

// Declare a temporary int varaible, and assign the

// value at index x to the variable

string temp_name = full_name[x];

// Assign the value at index i to index x

full_name[x] = full_name[i];

// Assign the value in temp_name variable to index i

full_name[i] = temp_name;

/* Sorting email array */

// Declare a temporary string varaible, and assign the

// value at index x to the variable

string temp_email = customer_email[x];

// Assign the value at index i to index x

customer_email[x] = customer_email[i];

// Assign the value in temp_email variable to index i

customer_email[i] = temp_email;

}

}

}

// Loop to display the details of the customer, in

// descending order

for(x = 0; x < num_records; x++)

{

// Display the complete customer details

cout<<"Account Number: "<<account_number[x]<<endl;

cout<<"Name: "<<full_name[x]<<endl;

cout<<"Email: "<<customer_email[x]<<endl;

cout<<"Balance: "<<balance[x]<<endl;

cout<<"-------------------------"<<endl;

}

// Close the input file object

infile.close();

// Return zero

return 0;

}

Sample output: