Getting a file into a double array?

[Triguy]

The assignment is to create a program that lets users reserve a spot on a plane either in coach or first class. I'm supposed to create a .txt file to use as the prices for different seats and while I have done that, I'm having trouble getting the file into a double array.

I hope I'm not breaking any rules or anything by posting this.

This is what I have so far.

//This program lets the user reserve airline tickets on a plane
#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;

int main()
{
	//variables
	ifstream inputFile;
	string filename;
	const int NUM_ROWS = 15;
	const int NUM_COLUMNS = 6;
	const int ARRAY_SIZE = 80;
	string numbers[NUM_ROWS][NUM_COLUMNS];
	int firstNumbers[ARRAY_SIZE];
	int count = 0;
	int reserve;
	int economicChoice;
	int row;
	int column;

	//opens file
	inputFile.open("C:\\SeatPrices.txt");

	//Reads the numbers from the file into the array.
	while (count < ARRAY_SIZE && inputFile >> firstNumbers[count])
		count++;

	//Populating the double array
	for (firstNumbers[count] = 0; firstNumbers[count] < ARRAY_SIZE; firstNumbers[count]++)
	{
		
	}

	//Finds out whether the user wants to reserve a seat or not
	cout << "Welcome to the Airline Reservation System.\n";
	cout << "What would you like to do?\n";
	cout << "Reserve a seat (1)\n";
	cout << "See total Sales (2)\n";
	cout << "Exit (3)\n";
	cin >> reserve;

	//validates the question of reserving a seat or not
	while (reserve < 1 || reserve > 3)
	{
		cout << "Error: Invalid Number.\n";
		cout << "Enter in '1' to reserve a seat";
		cout << "2 to see total sales.\n";
		cout << "Or 3 to exit.\n";
		cin >> reserve;
	}
	if (reserve == 1)
	{
		cout << "Would you like to reserve a spot in First Class (3) or Coach (4)?";
		cin >> economicChoice;

		//first class choices
		if (economicChoice == 3)
		{
			cout << "Great!\n";
			cout << "Here are youre options: (# = open seat, * = seat already taken)" << endl;
			cout << "   1 2  3 4\n";
			cout << "1. * *  * *\n";
			cout << "2. * *  # #\n";
			cout << "3. * #  # *\n";
			cout << "4. * #  # #\n";
			cout << "5. # #  * *\n";
			cout << "What row would you like to sit in? (1-5)\n";
			cin >> row;
			cout << "What seat would you like to sit in? (1-4)\n";
			cin >> column;

			// Validates options
			while (column < 1 || column > 4)
			{
				cout << "Error: Invalid Number Input.\n";
				cout << "Please enter a proper column number!\n";
				cin >> column;
			}
			while (row < 1 || row > 5)
			{
				cout << "Error: Invalid Number Input.\n";
				cout << "Please enter a proper row number!\n";
				cin >> row;
			}
			
		}
		//economy class choices
		else if (economicChoice == 4)
		{
			cout << "Good Choice!\n";
			cout << "Here are your options: (# = open seat, * = seat already taken)\n";
			cout << "    1 2 3  4 5 6\n";
			cout << " 6. * * #  # # *\n";
			cout << " 7. # # #  # # #\n";
			cout << " 8. # # *  # * *\n";
			cout << " 9. * * *  # * *\n";
			cout << "10. # # #  # # #\n";
			cout << "11. * * #  # # *\n";
			cout << "12. * * #  # # #\n";
			cout << "13. # # #  # * *\n";
			cout << "14. * # #  # * *\n";
			cout << "15. # # #  * * *\n";
			cout << "What row would you like to sit in? (6-15)\n";
			cin >> row;
			cout << "What seat would you like to sit in? (1-6)\n";
			cin >> column;
			
			//Validates options
			while (column < 1 || column > 6)
			{
				cout << "Error: Invalid Number Input.\n";
				cout << "Please enter a proper column number!\n";
				cin >> column;
			}
			while (row < 6 || row > 15)
			{
				cout << "Error: Invalid Number Input.\n";
				cout << "Please enter a proper row number!\n";
				cin >> row;
			}
		}
	}
	//option 2 of reserving a seat
	else if (reserve == 2);
	{
		cout << "Maybe next time!" << endl;
	}
}

Once I have the file into a double array, I have to use that array to implement it into the seat prices. Such as if user chooses to sit in row 1 seat 1 it would be that price. Also the '#' means open seat and '*' means seat taken. Thanks!
O yea, under the "//Populating the double array" is me trying to see if a for statement or a nested for statement would work.

[tcs]

Maybe I misunderstand your problem. If you want to read the contents of a file of 15 rows with 6 numbers each into the array, then you may try nested for-loops:

for (unsigned int row = 0; row < NUM_ROWS; row++)
{
    for (unsigned int col = 0; col < NUM_COLS; col++)
    {
        cin >> numbers[row][col];
    }
}

If the array should really contain numbers you may want to declare its items of type int or double instead of string.

[Triguy]

Will that hold the numbers from the file into the array?? In the code I posted I was thinking I could post it into a single array then switch it into a two-dimmensional array. And also yea I was hoping to implement the numbers from the file in the array into the seating later on so that somehow I could turn it to where the user can see the "cost" of the seat.

[tcs]

If you prefer a 1-dimensional array you may code:

for (unsigned int i = 0; i < NUM_ROWS * NUM_COLS; i++)
{
    cin >> firstNumbers[i];   // ... or wherever you want them to be entered.
}

Ah, and pay attention: cin from my example may be any other input stream if open like your inputFile.

If you want to write an arrays content into a file use operator<<() for output files instead of operator>>() for input files. F.e.:

cout << firstNumbers[i] << " "; // Write number on standard output followed by a space character.


EDIT: Added code-tags.

[tcs]

Have a look at Cplusplus.com Reference manual for input/output for a detailed usage of C++ IO-libraries. Especially error and end-of-file handling are important. There are lots of examples given.

[Triguy]

Ahh I get it now. That makes much more sense. Thank you so much for your help.

Perhaps I misworded I mean to use the file outputs as what the seat prices are. Not input anything into the file as it already has what I need in it.