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#include <iostream>
#include <fstream>
#include <string>
#include <cctype>
#include <iomanip>
using namespace std;
struct Inven
{
string Desc, // Item description
Date; // Date added to inventory
int Qty; // Quantity on hand
double WhsleCost, // Wholesale cost
RetailCost; // Retail cost
};
// Function prototype
void addRecord(Inven &, fstream &);
void displayRecord(Inven &, fstream &);
void changeRecord(Inven &, fstream &);
long byteNum(int);
void displayError();
bool validDate(string);
int main ()
{
Inven record;// = {" ", " ", 0, 0.0, 0.0};
int Input;
fstream File("inventory.dat", ios::out | ios::in | ios::binary);
if (!File)
{
cout << "Error opening file.\n";
return 0;
}
cout << " Inventory program menu.\n"
<< "Choose one of the following numbers to perform a task:\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";
cin >> Input;
switch (Input)
{
case 1 : addRecord(record, File);
break;
case 2 : displayRecord(record, File);
break;
case 3 : changeRecord(record, File);
}
File.close();
system("pause");
return 0;
}
//********************************************************************************
// addRecord *
// This function accepts an Inven structure and a fstream object as its *
// arguments. The user is asked to input the record information that is *
// validated and sotred in the file. *
//********************************************************************************
void addRecord(Inven &record, fstream &File)
{
File.seekp(0L, ios::end);
cout << "Enter the following inventory information:\n";
cout << "Item description: ";
cin.ignore();
getline(cin, record.Desc);
do
{
cout << "Date in the format MM/DD/YYYY: ";
cin.ignore();
getline(cin, record.Date);
if (validDate(record.Date) == 0)
{
cout << validDate(record.Date) << endl;
cout << "Error! Invalid date format.\n";
}
} while (validDate(record.Date) == 0);
do
{
cout << "Quantity :";
cin >> record.Qty;
if (record.Qty < 0)
displayError();
} while (record.Qty < 0);
do
{
cout << "Wholesale cost: ";
cin >> record.WhsleCost;
if (record.Qty < 0)
displayError();
} while (record.WhsleCost < 0);
do
{
cout << "Retail cost: ";
cin >> record.RetailCost;
if (record.RetailCost < 0)
displayError();
} while (record.RetailCost < 0);
File.write(reinterpret_cast<char *>(&record), sizeof(record));
}
//********************************************************************************
// displayRecord *
// This function accepts an Inven structure and a fstream object as its *
// arguments. The user is ask to input the number of the record to read and *
// display from the file. *
//********************************************************************************
void displayRecord(Inven &record, fstream &File)
{
int recNum;
cout << "Enter the record number: ";
cin >> recNum;
if (recNum < 1)
recNum = 1;
recNum--;
File.seekg(byteNum(recNum), ios::beg);
File.read(reinterpret_cast<char *>(&record), sizeof(record));
cout << "Record number: " << (recNum + 1) << endl;
cout << "Item description: ";
cout << record.Desc << endl;
cout << "Date : ";
cout << record.Date << endl;
cout << "Quantity :";
cout << fixed << showpoint << setprecision(2);
cout << record.Qty << endl;
cout << "Wholesale cost: ";
cout << record.WhsleCost << endl;
cout << "Retail cost: ";
cout << record.RetailCost << endl;
}
//********************************************************************************
// changeRecord *
// This function accepts an Inven structure and a fstream object as its *
// arguments. The user is asked to input the number of the record and the *
// information to change in the file. *
//********************************************************************************
void changeRecord(Inven &record, fstream &File)
{
int recNum;
cout << "Enter the record number: ";
cin >> recNum;
if (recNum < 1)
recNum = 1;
recNum--;
File.seekg(byteNum(recNum), ios::beg);
File.read(reinterpret_cast<char *>(&record), sizeof(record));
cout << "Enter the following inventory information:\n";
cout << "Item description: ";
cin.ignore();
getline(cin, record.Desc);
do
{
cout << "Date in the format MM/DD/YYYY: ";
cin.ignore();
getline(cin, record.Date);
if (!validDate(record.Date))
{
cout << validDate(record.Date) << endl;
cout << "Error! Invalid date format.\n";
}
} while (!validDate(record.Date));
do
{
cout << "Quantity :";
cin >> record.Qty;
if (record.Qty < 0)
displayError();
} while (record.Qty < 0);
do
{
cout << "Wholesale cost: ";
cin >> record.WhsleCost;
if (record.Qty < 0)
displayError();
} while (record.WhsleCost < 0);
do
{
cout << "Retail cost: ";
cin >> record.RetailCost;
if (record.RetailCost < 0)
displayError();
} while (record.RetailCost < 0);
File.seekp(byteNum(recNum), ios::beg);
File.write(reinterpret_cast<char *>(&record), sizeof(record));
}
//********************************************************************************
// byteNum *
// This function accepts an integer as its argument. Returns the byte number in *
// the file of the record whose number is passed as the argument. *
//********************************************************************************
long byteNum(int recNum)
{
return sizeof(Inven) * recNum;
}
//********************************************************************************
// diplayError *
// This function displays an input validation error message. *
//********************************************************************************
void displayError()
{
cout << "Error! number must be greater than 0.\n";
}
//********************************************************************************
// validDate *
// This function accepts a string as its argument and test its contents for a *
// valid date format. *
//********************************************************************************
bool validDate(string date)
{
if ( date.length() == 9)
date = "0" + date;
if (date.length() != 10)
return false;
for (int i = 0; i < date.length(); i++)
{
if (i == 2 || i == 5)
{
if (date[i] != '/')
{
return false;
}
continue;
}
if (!isdigit(date[i]))
return false;
}
return true;
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