programming assignment

#include <iostream>
#include <iomanip>
#include <cmath>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <cstdio>
#include <cctype>

using namespace std;

struct listing
{
	int itemno,quantity;
	char brand[50], stationery[50];
};

struct initialise
{
	int init, itemsize, brandsize;
};

int initialisef();
int menuf();
void listreadf();
int searchid();

int main()
{
	int menuloop=1, arraysize, menu, idcheck, addsize;
	char keyw[50];
	struct listing output, display;

	while (menuloop == 1)
	{
	ifstream item_num("item number.txt");
	ifstream stationery("stationery.txt");
	ifstream brand("brand.txt");
	ifstream quantity("quantity.txt");

	arraysize = initialisef();
	addsize = arraysize;

	struct listing* list = NULL;
	list = new listing[arraysize];

	for (int i = 0; i < arraysize; i++)
	{
			list[i].itemno = 0;
			strcpy(list[i].brand,"");
			strcpy(list[i].stationery,"");
			list[i].quantity = 0;
	}

	while (item_num)
	{
		for (int i = 0; i < arraysize; i++)
		{
			item_num >> list[i].itemno;
		}
	}

	while (stationery)
	{
		for (int i = 0; i <= arraysize; i++)
		{
			stationery.getline(list[i].stationery,50);
		}
	}

	while (brand)
	{
		for (int i = 0; i <= arraysize; i++)
		{
			brand.getline(list[i].brand,50);
		}
	}

	while (quantity)
	{
		for (int i = 0; i < arraysize; i++)
		{
			quantity >> list[i].quantity;
		}
	}

	menu = menuf();
		switch (menu)
		{
		case 1: // list
			system("CLS");
			cout << "Item number\tStationery" << "\t" << setw(9) <<"Brand" << "\t" << setw(9) << "Quantity" << endl;

			for (int i = 0; i < arraysize; i++)
			{
				cout << setw(7) << list[i].itemno << "\t\t" << setw(9) << list[i].stationery << "\t" << setw(9) << list[i].brand << "\t" << setw(6) << list[i].quantity << endl;
			}
			system("PAUSE");
			break;
		case 2: // search by item number
			idcheck = searchid();

			for (int i = 0; i < arraysize; i++)
			{
				if (list[i].itemno ==  idcheck)
				{
					display = list[i];
					system("CLS");
					cout << "Item number";
					cout << "\tStationery" << "\t" << setw(9) <<"Brand" << "\t" << setw(9) << "Quantity" << endl;
					cout << setw(7) << display.itemno << "\t\t" << setw(9) << display.stationery << "\t" << setw(9) << display.brand << "\t" << setw(6) << display.quantity << endl;
					system("PAUSE");
				}
			}

			break;
		case 3: // search by keyword
			cout << "Enter search keyword: ";
			cin >> keyw;

			for (int i = 0; i < arraysize; i++)
			{
				cout << keyw;
				if (strncmp(list[i].brand,"pen",50) == 0 || strncmp(list[i].stationery,"pen",50) == 0)
				{
					system("CLS");
					cout << "Item number";
					cout << "\tStationery";
					cout << "\t" << setw(9) <<"Brand" << endl;
					cout << setw(7) << list[i].itemno << "\t\t" << setw(9) << list[i].stationery << "\t" << setw(9) << list[i].brand << endl;
					system("PAUSE");
				}
				else
				{
					cout << list[i].brand;
					system("PAUSE");
				}
			}

			break;
		case 4: // low inventory

			system("CLS");
			cout << "Item number" << "\tStationery" << "\t" << setw(9) <<"Brand" << "\t" << setw(9) << "Quantity" << endl;
			for (int i = 0; i < arraysize; i++)
			{
				if ( list[i].quantity < 10)
				{
					cout << setw(7) << list[i].itemno << "\t\t" << setw(9) << list[i].stationery << "\t" << setw(9) << list[i].brand << "\t" << setw(6) << list[i].quantity << endl;
				}
			}
			system("PAUSE");

			break;
		case 5: // update
			break;
		case 6: // add
			cout << "Enter";
			break;
		case 7: // delete
			break;
		case 8: //exit
			menuloop = 0;
			break;
		default:
			menuloop = 1;
			break;
		}

		delete[] list;
	}


	return 0;
}

int initialisef()
{
	int out;

	ifstream initialise("initialise.txt");

	// checking
	if (!initialise)
	{
		cout << "Error opening the file.\n";
	}
	else
	{
		initialise >> out;
	}

	initialise.close();

	return out;
}

int menuf()
{
	int input;

	system("CLS");
	cout << "1. List.\n";
	cout << "2. Search by item number.\n";
	cout << "3. Search by keyword. WIP\n";
	cout << "4. Show low inventories.\n";
	cout << "5. Update. WIP\n";
	cout << "6. Add. WIP\n";
	cout << "7. Delete. WIP\n";
	cout << "8. Exit.\n";
	cin >> input;

	return input;
}

void listread()
{
	int listno;

	system("CLS");
	ifstream listfile( "item number.txt" );

	if (!listfile)
	{
		cout << "Error opening file.\n";
		exit(100);
	}
	else
	{
		cout << "Item number" << "\t\tStationery\n";
		listfile >> listno;
		while (listfile)
		{
			cout << setw(5) << listno << endl;
			listfile >> listno;
		}

		listfile.close();
	}
}

int searchid()
{
	int id;

	system("CLS");
	cout << "\n\n\t\t\t Item number search";
	cout << "\n\n\n\tEnter item number to search: ";
	cin >> id;

	return id;
}