Inventory Program Inventory Program Write a program that use

Inventory Program

Inventory Program 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 the 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 deter-mines are unreasonable.

Solution

#include <iostream>
#include <fstream>
#include <iomanip>
#include <cctype>
using namespace std;
void viewRec(fstream &)
const int DESC_SIZE = 51;
const int DATE_SIZE = 11;
struct InventoryItem   
{
char desc[DESC_SIZE];
int quantity;
double whlCost;
double rtlCost;
char date[DATE_SIZE];
};
int menu();
void addRec(fstream &);
void viewRec(fstream &);
void chgRec (fstream &);
int main()
{
long selection;
long recNum;
fstream inventory (\"Inventory.dat\", ios::in | ios::out | ios::binary);
InventoryItem record = {\" \", 0, 0.0};
cout << fixed << showpoint << setprecision(2);
cout<<\"Inventory Managment\"<<endl;
for (int count = 0; count < 5; count++)
{
inventory.write(reinterpret_cast<char *>(&record),sizeof(record));
}
inventory.close();
inventory.open(\"Inventory.dat\", ios::out | ios::binary);
while (selection != 4)
{
switch (selection)
{
case 1:      
{
addRec(inventory);
break;
}
case 2:      
{
viewRec(inventory);
break;
}
case 3:      
{
chgRec(inventory);
break;
}
default:  
{
cout << \"Invalid selection\" << endl;
}
selection = menu();
}
}
cout<<\"Hava a nice day.\"<<endl;
inventory.close();
system(\"pause\");
return 0;
}
int 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) : \";
cin>>choice;
}
cout<<endl;
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)
{
fstream inventory (\"Inventory.dat\", ios::out | ios::binary);
InventoryItem record;
long recNum;
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));
cout << \"Description: \" << record.desc << endl;
cout << \"Quantity: \" << record.quantity << endl;
cout << \"Wholesale cost: \" << record.whlCost << endl;
cout << \"Retail price: \" << record.rtlCost << endl;
cout << \"Date (in 00/00/0000 format): \" << record.date << endl;
cout << endl;
if(file.fail())
file.clear();
file.close();
}
void chgRec(fstream &file)
{
fstream inventory (\"InventoryFile.dat\", ios::out | ios::binary);
InventoryItem record;
long recNum;
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: \" << record.desc << endl;
cout << \"Quantity: \" << record.quantity << endl;
cout << \"Wholesale cost: \" << record.whlCost << endl;
cout << \"Retail price: \" << record.rtlCost << endl;
cout << \"Date (in 00/00/0000 format): \" << record.date << endl;
cout << endl;
inventory.seekp(recNum * sizeof(record), ios::beg);
inventory.write(reinterpret_cast<char *>(&record),sizeof(record));
inventory.close();
}