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#include <iostream>
#include <fstream>
#include <iomanip>
#include <cctype>
using namespace std;
const int DESC_SIZE = 51;
const int DATE_SIZE = 51;
const int NUM_RECORDS = 10;
struct InventoryItem
{
char desc[DESC_SIZE];
int quantity;
double whlCost;
double rtlCost;
char date[DATE_SIZE];
int menu();
};
void addRec(fstream &);
void dispRec(fstream &);
void chgRec(fstream &);
int InventoryItem::menu()
{
int choice;
cout << "Please make a selection, 1 through 4." << endl;
cout << "1. Add a new record" << endl;
cout << "2. View an exisitng record" << endl;
cout << "3. Change an exisitng record" << endl;
cout << "4. Exit" << endl;
cout << endl;
cout <<"Enter your choice (1-4): ";
cin >> choice;
while(choice < 1 || choice > 4)
{
cout << "Invaild selection!" << endl;
cout << "Please enter your choice (1-4) : "<< endl;
cin >> choice;
}
return choice;
}
void addRec(fstream &file)
{
cout << "Enter the following inventory data:"<<endl;
fstream inventory("inventory.dat", ios::out | ios::binary);
InventoryItem record;
cout << "Description: ";
cin.ignore();
cin.getline(record.desc, 51);
cin >> record.desc;
cout << "Quantity: ";
cin >> record.quantity;
cout << "Wholesale cost: ";
cin >> record.whlCost;
cout << "Retail price: ";
cin >> record.rtlCost;
cout << "Date added to inventory (in 00/00/0000 format): ";
cin >> record.date;
inventory.write(reinterpret_cast<char *>(&record),sizeof(record));
cout << "Record added to file."<<endl;
file.close();
}
void dispRec(fstream &file)
{
InventoryItem record;
long recNum;
fstream inventory ("inventory.dat", ios::in | ios::binary);
if (!inventory)
{
cout << "Error opening file.";
}
cout << "Enter the record number of the item to view:";
cin >> recNum;
inventory.seekg(recNum * sizeof(record), ios::beg);
inventory.read(reinterpret_cast<char *>(&record),sizeof(record));
while (!inventory.eof())
{
cout << "Description: ";
cout << record.desc << endl;
cout << "Quantity: ";
cout << record.quantity << endl;
cout << "Wholesale cost: ";
cout << record.whlCost << endl;
cout << "Retail price: ";
cout << record.rtlCost << endl;
cout << "Date (in 00/00/0000 format): ";
cout << record.date << endl; }
inventory.close();
}
void chgRec(fstream &file)
{
InventoryItem record;
long recNum;
fstream inventory ("inventory.dat", ios::in | ios::out | ios::binary);
if (!inventory)
{
cout << "Error opening file.";
}
cout << "Enter the record number of the item you want to edit: ";
cin >> recNum;
inventory.seekg(recNum * sizeof(record), ios::beg);
inventory.read(reinterpret_cast<char *>(&record),sizeof(record));
cout << "Description: ";
cout << record.desc << endl;
cout << "Quantity: ";
cout << record.quantity << endl;
cout << "Wholesale cost: ";
cout << record.whlCost << endl;
cout << "Retail price: ";
cout << record.rtlCost << endl;
cout << "Date (in 00/00/0000 format): ";
cout << record.date << endl;
cout << "Enter the new data." << endl;
cout << "Description: ";
cin.ignore();
cin.getline(record.desc, DESC_SIZE);
cout << "Quantity: ";
cin >> record.quantity;
cout << "Wholesale cost: ";
cin >> record.whlCost;
cout << "Retail price: ";
cin >> record.rtlCost;
cout << "Date (in 00/00/0000 format): ";
cin >> record.date;
inventory.seekp(recNum * sizeof(record), ios::beg);
inventory.write(reinterpret_cast<char *>(&record),sizeof(record));
inventory.close();
}
int main()
{
fstream InventoryFile;
string word;
long selection;
InventoryItem test;
selection = test.menu();
InventoryItem record = {" ", 0, 0.0, 0.0, " "};
cout << fixed << showpoint << setprecision(2);
cout<<"Inventory Managment"<<endl;
fstream inventory ("inventory.dat", ios::out | ios::binary);
if (!inventory)
{
cout << "Error opening file.";
return 0;
}
for (int count = 0; count < NUM_RECORDS; count++)
{
cout << "Writing" << count << endl;
inventory.write(reinterpret_cast<char *>(&record),sizeof(record));
}
while (selection != 4)
{
switch(selection)
{
case 1:
{
addRec(inventory);
break;
}
case 2:
{
dispRec(inventory);
break;
}
case 3:
{
chgRec(inventory);
break;
}
default:
{
cout << "Invalid selection" << endl;
}
selection = record.menu();
}
}
inventory.close();
return 0;
}
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