A5 - Files (\'KEY\' assignment) Write a program that uses two identical arrays o

Question

A5 - Files ('KEY' assignment)

Write a program that uses two identical arrays of at least 20 integers. It should call a function that uses the bubble sort algorithm to sort one of the arrays in ascending order. The function should keep a count of the number of exchanges it makes. The rogram then should call a function that uses the selection sort algorithm to sort the other array. It should also keep count of the number of exchanges it makes. Display these values on the screen.

Use the following function prototypes:

void addRecord(fstream &); void viewRecord(fstream &); void changeRecord(fstream &);

Turn in the following files:

a5main.cpp program compile and run screenshots design document sample created file

Explanation / Answer

#include <iostream>
#include <string>
#include <fstream>
#include <cctype>
#include <iomanip>

using namespace std;

// Declare function prototypes
void addRecord(fstream &);
void viewRecord(fstream &);
void changeRecord(fstream &);

const short DESC_NUM = 51, DATE = 12;

struct inventory
{
    char item[DESC_NUM];
    int stock;
    float wsale;
    float rsale;
    char date[DATE];
};

// declared here to be usable in the function definitions
inventory inv; // Holds the inventory entries

int main()
{
    fstream record; // Writes to an inventory file
    int opt;        // Selects the function to be used

    do
    {
        // Prompt the user for function selection
        cout << "Select a function [1-3]: ";
        cout << "[1] Add a record to the inventory file" << endl;
        cout << "[2] View the records in the inventory file" << endl;
        cout << "[3] Change the records in the inventory file" << endl;
        cout << "[0] Exit"<< endl;

        cin >> opt;
      
        // Use the user input to call the desired function
        switch (opt)
        {
            case 1 : addRecord(record);
                break;
            case 2 : viewRecord(record);
                break;
            case 3 : changeRecord(record);
                break;
            default:
                break;
        }

    // So long as the user doesn't enter '0' keep the program running
    }while(opt != 0);
  
    record.close(); // Close the file before exiting the program

    return 0;
}

// Define addRecord
void addRecord(fstream &file)
{
    char again; // Determine if the user wants to add another item to inventory.
    cout << "New inventory entry selected. " << endl;
  
    // Open the file for writing
    file.open("inv.dat", ios::out | ios::app);
  

    cout << " Enter the attributes for this entry below. ";
    cout << "Enter the item description: ";
    cin.ignore();
    cin.getline(inv.item, DESC_NUM);
    cout << "Number of units in stock: ";
    cin >> inv.stock;
    cin.ignore();   // Make sure to ignore that newline character
    cout << "Price wholesale: ";
    cin >> inv.wsale;
    cin.ignore();
    cout << "Price retail: ";
    cin >> inv.rsale;
    cout << "Date recieved: ";
    cin.ignore();
    cin.getline(inv.date, DATE);

    file.write(reinterpret_cast<char *>(&file), sizeof(file));
    file.close();

}

// Define viewRecord
void viewRecord(fstream &file)
{
    char i;
    cout << " Displaying the current inventory list..." << endl;
  
    // Open the file as being readable
    file.open("inv.dat", ios::in);

    // Read the first record from the file
    file.read(reinterpret_cast<char *>(&file), sizeof(file));

    // Keep displaying the inventory as long as the end of file hasn't been reached
    while(!file.eof())
    {
        cout << "Item: " << inv.item << endl;
        cout << "Number in stock: " << inv.stock << endl;
        cout << "Price wholesale: "<< fixed << setprecision(2) << inv.wsale << endl;
        cout << "Price resale: " << fixed << setprecision(2) << inv.rsale << endl;
        cout << "Date recieved: " << inv.date << endl;

        // Wait for the user to hit enter
        cout << " Press the enter key to see the next entry. ";
        cin.get(i);

        // Read the next record in the file
        file.read(reinterpret_cast<char *>(&file), sizeof(file));
    }
  
    cout << a" That's all the entries currently in the file. ";
    file.close();
}

// Define changeRecord
void changeRecord(fstream &file)
{
    // Placeholder statement, needs to be replaced.
    cout << "Allowing you to change an entry: " << endl;
}

output

Select a function [1-3]:                                                                                                                                    
                                                                                                                                                            
[1] Add a record to the inventory file                                                                                                                      
[2] View the records in the inventory file                                                                                                                  
[3] Change the records in the inventory file                                                                                                                
[0] Exit                                                                                                                                                    
2                                                                                                                                                           
                                                                                                                                                            
Displaying the current inventory list...                                                                                                                    
Item:                                                                                                                                                       
Number in stock: 0                                                                                                                                          
Price wholesale: 0.00                                                                                                                                       
Price resale: 0.00                                                                                                                                          

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