Question

Inventory Program (C++)

Write a program that uses a structure to store the following inventory data in a file:

- Item Description

-Quantity on Hand

-Wholesale cost

-Retail cost

-Date Added to Inventory

The program should have a menu that allows the user to perform the following tasks:

-Add new records to file

-Display any record in the file

-Change any record in the file

Input Validation: The program should not accept quantities, or wholesale or retail costs, less than 0. The program should not accept dates that the programmer determines are unreasonable.

Answer 1

Solution

 #include <iostream> #include <fstream> #include <cctype> using namespace std; const int DESCRIPTIONSIZE = 50, DATASIZE = 10; struct strinventory {   char description[DESCRIPTIONSIZE];      int qty;                                        int wholesaleCost;                              int retailCost;                                 char dateAdded[DATASIZE];        }; // function declaration void createstrinventory(strinventory &, fstream &, int &); int displaymenu(); void newRecord(strinventory &, fstream &, int &); void displayRecord(strinventory &, fstream &, int ); void changeRecord(strinventory &, fstream &, int ); //main function int main() {       int totRecords = 0;                     int chocice = 0;                        // creating the file if the file already exists         fstream inventoryFile("Inventory.dat", ios::in | ios::out | ios::binary | ios::trunc);  strinventory product;           if (!inventoryFile)     {               cout << "Error opening the file"<<endl;     }       createstrinventory(product, inventoryFile, totRecords);                 while (chocice != 4)    {               chocice = displaymenu();                switch (chocice)                {               case 1:                         newRecord(product,inventoryFile,totRecords);                    break;          case 2:                         displayRecord(product,inventoryFile,totRecords);                        break;          case 3:                         changeRecord(product, inventoryFile, totRecords);                       break;          case 4:                         break;          default:                        cout << "Invalid choice\n";               }       }       cout << "Program end\n";          // close the file       inventoryFile.close();  return 0; } // *=== END MAIN FUNCTION ===* // function definitions ================================================== // ====== FUNCTION DEFINITION ====== // let user fill in info for a product // user can create as many records as necessary void createstrinventory(strinventory &product, fstream &fileName, int &records) {         char choiceaddrec;                      int totRecords = 0;     do      {               cout << "Enter the details of the product:\n";            cout << "Item Description: ";             cin.getline(product.description, DESCRIPTIONSIZE);              do {                    cout << "Quantity on hand: ";                     cin >> product.qty;                       cin.ignore();           } while (product.qty < 0);           do {                    cout << "Wholesale cost: ";                       cin >> product.wholesaleCost;                     cin.ignore();           } while (product.wholesaleCost < 0);                 do {                    cout << "Retail cost: ";                  cin >> product.retailCost;                        cin.ignore();           } while (product.retailCost < 0);                            do{                     cout << "Date added to inventory (MM/DD/YYYY): ";                         cin.getline(product.dateAdded, DATASIZE);               } while (!(ispunct(product.dateAdded[2])) || !(ispunct(product.dateAdded[5])));                                 fileName.write(reinterpret_cast<char *>(&product), sizeof(product));                          cout << "Do you want to write another record? (y for yes)\n";             cin >> choiceaddrec;              cin.ignore();           ++totRecords;   } while (choiceaddrec == 'Y' || choiceaddrec == 'y');   records += totRecords; } int displaymenu() {    int choice;     cout << "\n\n =================================\n";       cout << "\tMenu\n";       cout << "Choose a chocice:\n";    cout << "1) add new records to the file\n";       cout << "2) display any record in the file\n";    cout << "3) change any record in the file\n";     cout << "4) Quit\n";      cout << "\n =================================\n\n";       cin >> choice;    cin.ignore();   return choice; } void newRecord(strinventory &product,fstream &fileName, int &records) {    fileName.clear(); // clear flags        int numRecordAdded = 0; // number of new records added  char choiceaddrec;              // To hold Y or N       // go to the end of the file to append the new record   fileName.seekg(0L, ios::end);           cout << "\n\tAdd new records\n";  do      {               cout << "Enter the following data about a product:\n";            cout << "Item Description: ";             cin.getline(product.description, DESCRIPTIONSIZE);              do {                    cout << "Quantity on hand: ";                     cin >> product.qty;                       cin.ignore();           } while (product.qty < 0);           do {                    cout << "Wholesale cost: $";                      cin >> product.wholesaleCost;                     cin.ignore();           } while (product.wholesaleCost < 0);                 do {                    cout << "Retail cost: $";                         cin >> product.retailCost;                        cin.ignore();           } while (product.retailCost < 0);            do{                     cout << "Date added to strinventory (MM/DD/YYYY): ";                      cin.getline(product.dateAdded, DATASIZE);               } while (!(ispunct(product.dateAdded[2])) || !(ispunct(product.dateAdded[5])));                                 fileName.write(reinterpret_cast<char *>(&product), sizeof(product));                          cout << "Do you want to write another record? (y for yes)\n";             cin >> choiceaddrec;              cin.ignore();           ++numRecordAdded;       } while (choiceaddrec == 'Y' || choiceaddrec == 'y');    records += numRecordAdded; } void displayRecord(strinventory &product, fstream &fileName, int records) {       fileName.clear(); // clear flags        cout << "\n\tDisplay a record\n";         int recNum;             // seek the file to the beginning       fileName.seekg(0L, ios::beg);   cout << "You have " << records << " records" << endl;   cout << "Which record would you like to display? ";       cin >> recNum;    cin.ignore();   --recNum; // minus 1 to seek properly   // seek to the record, store(read it), and display it   fileName.seekg(sizeof(product) * recNum, ios::beg);     fileName.read(reinterpret_cast<char *>(&product), sizeof(product));   cout << "Displaying record #" << (recNum + 1) << endl << endl;  cout << "Item description: " << product.description << endl;  cout << "Quantity on hand: " << product.qty << endl;  cout << "Wholesale cost: " << product.wholesaleCost << endl;  cout << "Retail cost: " << product.retailCost << endl;        cout << "Date added to strinventory (MM/DD/YYYY): " << product.dateAdded << endl;     // seek the file back to the beginning  fileName.seekg(0L, ios::beg); } void changeRecord(strinventory &product, fstream &fileName, int records) {      fileName.clear(); // clear flags        int recCh;              // record to change     cout << "\n\tChange a record\n";  cout << "You have " << records << " records" << endl;   cout << "Which record would you like to change? ";        cin >> recCh;     cin.ignore();   --recCh; // minus 1 to seek properly    // seek to the record   fileName.seekg(sizeof(product) * recCh, ios::beg);      // let the user change the record       cout << "Changing record #" << (recCh + 1) << endl << endl;     cout << "Enter the following data about a product:\n";    cout << "Item Description: ";     cin.getline(product.description, DESCRIPTIONSIZE);      do {            cout << "Quantity on hand: ";             cin >> product.qty;               cin.ignore();   } while (product.qty < 0);   do {            cout << "Wholesale cost: $";              cin >> product.wholesaleCost;             cin.ignore();   } while (product.wholesaleCost < 0);         do {            cout << "Retail cost: $";                 cin >> product.retailCost;                cin.ignore();   } while (product.retailCost < 0);    do{             cout << "Date added to strinventory (MM/DD/YYYY): ";              cin.getline(product.dateAdded, DATASIZE);       } while (!(ispunct(product.dateAdded[2])) || !(ispunct(product.dateAdded[5])));         // rewrite over record in the file      fileName.write(reinterpret_cast<char *>(&product), sizeof(product));  // seek the file back to the beginning  fileName.seekg(0L, ios::end);   cout << "The file has been rewritten\n"; } 

Screenshot

Enter the following data about a product: Item Description: Pepsi Quantity on hand: 15 Wholesale cost: $5 Retail cost: $6 Date added to inventory (MM/DD/YYYY): 11/12/2019 Do you want to write another record? (y for yes) Enter the following data about a product: Item Description: Coca cola Quantity on hand: 5 Wholesale cost: $5 Retail cost: $7 Date added to inventory (MM/DD/YYYY): 11/2/2019 Date added to inventory (MM/DD/YYYY): 2/11/2019 Date added to inventory_(MM/DD/YYYY): 02/11/2019 Do you want to write another record? (y for yes) EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE Menu Choose a task: 1) add new records to the file 2) display any record in the file 3) change any record in the file 4) Quit == == === === == === == = ==== == === === == =