This program works fine, but I need help with the date validation. I have a regular expression that checks for dash patterns and integers and that is all. Is there some way I can add a date validation that can check for improper dates and leap year? If so, is it possible to add it to the regular expression I have already created, or will I need to create a seperate one? Here is my code:
// inventory.cpp : Defines the entry point for the console application.
//
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <regex>
using namespace std;
const int DESC_SIZE = 50;
struct Date{
int Month;
int Day;
int Year;
};
struct Inventory
{
char desc[DESC_SIZE];
int quantity;
double whlCost,
rtlCost;
Date date;
};
void menu(std::fstream&);
bool addRecord(std::fstream&);
bool displayRecord(std::fstream&);
bool changeRecord(std::fstream&);
Date dateValidation(string);
int main()
{
cout << fixed << showpoint << setprecision(2);
fstream file;
ifstream ifile("Inventory.dat");
if (!ifile)
{
Date date;
date.Day = 1;
date.Month = 1;
date.Year = 1970;
Inventory rec = {"Default", 0, 0.0, 0.0, date};
file.open ("Inventory.dat", fstream::out | fstream::binary);
for (int count = 0; count < 10; count++)
{
file.write((char*)&rec,sizeof(rec));
}
cout << endl << "Warning, did not find file, so we created one.";
cout << endl;
file.close();
}
// Create Menu and run program
menu(file);
system("pause");
return 0;
}
Date dateValidation(string data){
Date date;
match_results<string::const_iterator> m;
regex re("([0-9]+)-([0-9]+)-([0-9]*)?");
if (regex_match(data, m, re)) {
date.Day = stoi(m[1].str()),
date.Month = stoi(m[2].str()),
date.Year = stoi(m[3].str());
}
else date.Year = 0000;
return date;
}
void menu(std::fstream& file)
{
int choice = 0;
bool success;
while(choice!= 4) {
cout << "Auto Zone Inventory" << endl;
cout << endl << "1. Add new records to the file" << endl;
cout << "2. Display any record in the file" << endl;
cout << "3. Change any record in the file" << endl;
cout << "4. Quit the program" << endl;
cout << endl;
cout << "Please enter your choice (1-4): ";
cin >> choice;
while (choice < 1 || choice > 4)
{
cout << endl << "Invalid entry. Please enter a number (1-4)" << endl;
cin >> choice;
}
cout << endl;
switch(choice){
case 1:
success = addRecord(file);
break;
case 2:
success = displayRecord(file);
break;
case 3:
success = changeRecord(file);
break;
case 4:
success = true;
cout << "Thank you for using this program. Auto Zone cares!" << endl;
break;
default :
cout << "Error " << choice << " is not a valid number";
break;
}
if (!success) cout << "File IO Error reading file!";
else {
system("Pause");
system("cls");
}
}
}
bool addRecord(std::fstream& file)
{
cout << "Please enter new record data" << endl;
Inventory rec;
string dateStr;
file.open ("Inventory.dat", fstream::out | fstream::app | fstream::binary);
cout << endl << "Item Description:" << endl;
cin.ignore();
cin.getline(rec.desc, DESC_SIZE);
cout << rec.desc << endl;
cout << endl << "Quantity on hand:" << endl;
cin >> rec.quantity;
while (rec.quantity < 0)
{
cout << endl << "Invalid entry. Please enter only positive values." << endl;
cin >> rec.quantity;
}
cout << endl << "Wholesale Cost" << endl;
cin >> rec.whlCost;
while (rec.whlCost < 0)
{
cout << endl << "Invalid entry. Please enter only positive values." << endl;
cin >> rec.whlCost;
}
cout << endl << "Retail Cost" << endl;
cin >> rec.rtlCost;
while (rec.rtlCost < 0)
{
cout << endl << "Invalid entry. Please enter only positive values." << endl;
cin >> rec.rtlCost;
}
bool loop = true;
while (loop){
cout << endl << "Date added to inventory (MM-DD-YYYY)" << endl;
cin.ignore();
cin >> dateStr;
rec.date = dateValidation(dateStr);
if (rec.date.Year != 0000) {
loop = false;
}
else
cout << endl << "Error Date Format is (MM-DD-YYYY)" <<endl;
}
file.write(reinterpret_cast<char *>(&rec),sizeof(rec));
cout << endl << "Record added to inventory" << endl;
file.close();
return true;
}
bool displayRecord(std::fstream& file)
{
Inventory rec;
file.open ("Inventory.dat", fstream::in | fstream::binary);
long num;
//Figure out How many records exist
long a = file.tellg();
file.seekg(0, fstream::end);
long b = file.tellg();
long sizeFile = b - a;
int c = sizeof(rec);
int numRecords = (sizeFile / c);
if (numRecords > 0){
cout << "Please enter the record you would like to view (1-"<< (numRecords) <<")" << endl;
cin >> num;
if ((num >= 0) && (num <= (numRecords))){
num = num -1;
file.seekg(num * sizeof(rec), fstream::beg);
file.read(reinterpret_cast<char *>(&rec), sizeof(rec));
if (!file.eof())
{
cout << endl << "Here is your current record:" << endl;
cout << endl << "Item Description: ";
cout << rec.desc << endl;
cout << "Quantity on hand: ";
cout << rec.quantity << endl;
cout << "Wholesale cost: ";
cout << rec.whlCost << endl;
cout << "Retail cost: ";
cout << rec.rtlCost << endl;
cout << "Date added to inventory: ";
cout << rec.date.Day << "-" << rec.date.Month << "-" << rec.date.Year << endl;
}
file.close();
}
else {
cout << "Record Outside of Database Range" << endl;
}
}
else {
cout << "No Records Found !" << endl;
return false;
}
return true;
}
bool changeRecord(std::fstream& file)
{
Inventory rec;
Inventory* recs;
string dateStr;
string yn;
char* buffer;
long num;
file.open ("Inventory.dat", fstream::in | fstream::out | fstream::binary);
//Figure out How many records exist
long a = file.tellg();
file.seekg(0, fstream::end);
long b = file.tellg();
long sizeFile = b - a;
int numRecords = 0;
if (sizeFile > 4){
int c = sizeof(rec);
numRecords = (sizeFile / c);
}
if (numRecords > 0){
cout << "Please enter the record you would like to view (1-"<< (numRecords) <<")" << endl;
cin >> num;
if (!file.eof()){
num = num -1;
file.seekg(num * sizeof(rec), fstream::beg);
file.read(reinterpret_cast<char *>(&rec), sizeof(rec));
cout << endl << "Here is your current record" << endl;
cout << endl << "Item description: ";
cout << rec.desc << endl;
cout << "Quantity on hand: ";
cout << rec.quantity << endl;
cout << "Wholesale cost: ";
cout << rec.whlCost << endl;
cout << "Retail cost: ";
cout << rec.rtlCost << endl;
cout << "Date added to inventory: ";
cout << rec.date.Day << "-" << rec.date.Month << "-" << rec.date.Year << endl;
}
cout << endl << "Do you want to proceed ? (Y/N)" << endl;
cin >> yn;
if ((yn == "Y")||(yn == "y")){
cout << endl << "Please enter your new data to the record"<< endl;
cout << endl << "Item description:" << endl;
cin.ignore();
cin.getline(rec.desc, DESC_SIZE);
cout << endl << "Quantity on hand:" << endl;
cin >> rec.quantity;
while (rec.quantity < 0)
{
cout << endl << "Invalid entry. Please enter only positive values." << endl;
cin >> rec.quantity;
}
cout << endl << "Wholesale cost:" << endl;
cin >> rec.whlCost;
while (rec.whlCost < 0)
{
cout << endl << "Invalid entry. Please enter only positive values." << endl;
cin >> rec.whlCost;
}
cout << endl << "Retail cost:" << endl;
cin >> rec.rtlCost;
while (rec.rtlCost < 0)
{
cout << endl << "Invalid entry. Please enter only positve values." << endl;
cin >> rec.rtlCost;
}
bool loop = true;
while (loop){
cout << endl << "Date added to inventory (MM-DD-YYYY)" << endl;
cin.ignore();
cin >> dateStr;
rec.date = dateValidation(dateStr);
if (rec.date.Year != 0000) {
loop = false;
}
else
cout << endl << "Error Date Format is (MM-DD-YYYY)" <<endl;
}
file.seekp(num * sizeof(rec), fstream::beg);
file.write(reinterpret_cast<char *>(&rec), sizeof(rec));
cout << endl << "The Record has been edited." << endl;
}
}
else cout << endl << "File contains no records!" << endl;
file.close();
return true;
}
