Create pseudocode and C++ code for a program that displays the inventory of your
ID: 3770333 • Letter: C
Question
Create pseudocode and C++ code for a program that displays the inventory of your goofy gift shop. The inventory is in a file called lab10.txt. The file contains 3 fields for each record: 1.Item name. 2.Quantity in inventory. 3.Item price. Your program will display the contents of the file in three columns labeled “Name”, “Quantity”, and “Price”. Your program will display a forth column of data labeled “Value” that will be the quantity * price for each inventory item. Your program does not know how many items are in inventory, so it should read until there are no more records. Your program will have a value returning function used to calculate the value for each item in inventory. It will take as input the quantity and price of an item and will return the value of that item.
lab10.txt
Han Solo in Carbonite Rug
27 units
62.99
Shark Plush Slippers for Grown Ups
35 units
24.99
Halo 4 USNC Messenger Bags
41 units
79.99
Star Wars Automotive Floor Mats
12 units
39.99
Batman Diaper Bag
10 units
34.99
Star Trek TNG Uniform Bodysuits
58 units
19.99
The Walking Dead Monopoly
17 units
39.99
Explanation / Answer
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
using namespace std;
void addRecord(fstream &);
void viewRecord(fstream &);
void changeRecord(fstream &);
int menu();
const int DESC_SIZE = 21;
const int DATE_SIZE = 11;
struct inventoryData
{
char desc[DESC_SIZE]; //Desc up to 20 chars
int quantity; //Item quantity
double wholesale; //Item wholsale Cost
double retail; //Item retail Cost
char date[DATE_SIZE]; //Date able to hold info up to xx/xx/xxxx
};
int main()
{
int selection;
int recordNumber;
fstream dataFile("inventory.dat", ios::in | ios::out | ios::binary);
if (dataFile.fail())
{
// The file does not exist, so create it.
dataFile.open("inventory.dat", ios::out);
}
selection = menu();
while (selection != 4)
{
switch (selection)
{
case 1:
{
viewRecord(dataFile);
break;
}
case 2:
{
addRecord(dataFile);
break;
}
case 3:
{
changeRecord(dataFile);
break;
}
default:
{
cout << "Invalid - Please use 1 to 4" << endl;
break;
}
selection = menu();
}
}
dataFile.close();
return 0;
}
void addRecord(fstream &file)
{
fstream dataFile("inventory.dat", ios::in | ios::out | ios::binary);
inventoryData item;
cout << "Please enter the following data about the item" << endl;
cout << "Description: ";
cin.ignore();
cin.getline(item.desc, DESC_SIZE);
cout << "Quantity: ";
cin >> item.quantity;
cout << "Quantity: ";
cin >> item.quantity;
cout << "Wholesale cost: ";
cin >> item.wholesale;
cout << "Retail price: ";
cin >> item.retail;
cout << "Date (Please use MO/DA/YEAR format: ";
cin >> item.date;
dataFile.write(reinterpret_cast<char *>(&item), sizeof(item));
return;
}
void viewRecord(fstream &file)
{
string output;
fstream dataFile("inventory.dat", ios::in | ios::out | ios::binary);
inventoryData item;
fstream items;
char again;
dataFile.read(reinterpret_cast<char *>(&item), sizeof(item));
while (!items.eof())
{
// Display the record.
cout << "Description: " << item.desc << endl;
cout << "Quantity: " << item.quantity << endl;
cout << "Wholesale Cost: " << item.wholesale << endl;
cout << "Retail Cost: " << item.retail << endl;
cout << "Date: " << item.date << endl;
// Wait for the user to press the Enter key.
cout << " Press the Enter key to see the next record. ";
cin.get(again);
// Read the next record from the file.
dataFile.read(reinterpret_cast<char *>(&item), sizeof(item));
}
}
void changeRecord(fstream &file)
{
fstream dataFile("inventory.dat", ios::in | ios::out | ios::binary);
inventoryData item;
int recordNumber;
cout << "Please choose a record number you want to edit" << endl;
cin >> recordNumber;
dataFile.seekg(recordNumber * sizeof(item), ios::beg);
dataFile.read(reinterpret_cast<char *>(&item), sizeof(item));
cout << "Description: " << item.desc << endl;
cout << "Quantity: " << item.quantity << endl;
cout << "Wholesale cost: " << item.wholesale << endl;
cout << "Retail price: " << item.retail << endl;
cout << "Date: " << item.date << endl;
cout << endl;
// Get the new record data.
cout << "Enter the new data: ";
cout << "Description: ";
cin.ignore();
cin.getline(item.desc, DESC_SIZE);
cout << "Quantity: ";
cin >> item.quantity;
cout << "Quantity: ";
cin >> item.quantity;
cout << "Wholesale cost: ";
cin >> item.wholesale;
cout << "Retail price: ";
cin >> item.retail;
cout << "Date (Please use MO/DA/YEAR format: ";
cin >> item.date;
// Move back to the beginning of this record's position
dataFile.seekp(recordNumber * sizeof(item), ios::beg);
// Write new record over the current record
dataFile.write(reinterpret_cast<char *>(&item), sizeof(item));
}
int menu()
{
int menuSelection;
cout << fixed << showpoint << setprecision(2);
cout << "----------Inventory----------" << endl;
cout << "1 - View inventory" << endl;
cout << "2 - Add an item" << endl;
cout << "3 - Edit an item" << endl;
cout << "4 - End Program" << endl;
cin >> menuSelection;
if (!cin)
{
cout << "Invalid - Please use 1 to 4" << endl;
cin >> menuSelection;
}
if (menuSelection < 1 || menuSelection > 4)
{
cout << "Invalid - Please use 1 to 4" << endl;
cin >> menuSelection;
}
return menuSelection;
}
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