Array initialization has me dumbfounded.

So let me preface this by saying that I am a college student taking c++. My professor has given us the task of designing an "airline reservation" program, (don't get excited, nothing amazing here) using a three dimensional array as the method of tracking plane, row, and seat that is reserved.

My problem comes in the array. I have intialized it by saying

Code:

int planebooker [PLANE] [ROWS] [SEATS] = {0};

PLANE ROW and SEATS are all const ints, with the # of planes in the fleet, and the # of rows and seats in the planes. (we are going fairly casic 5 seats and 40 rows.)

When someone books the seat, I am trying to use

Code:

planebooker [x][y][z] = 1;

to set a seat to reserved (x y and z are just an example this was taken from a set of for loops).

My problem is, not matter what I do, whether i run a trio of for loops to set every seat on the plane to reserved (1), or if I let the customer pick what seat they want I can't get the spot in the array to display a 1.

Anyone have any obvious things that I am missing? I have double checked to make sure that any and all ='s are set to == when comparing, past that, I am not sure what's up. If you want, I can post the entire code, but it's rather long.

Originally Posted by chad_crider

If you want, I can post the entire code, but it's rather long.

Perhaps first post a minimal "stripped-down" version (which would compile) that exactly demonstrates the problem you are having difficulty with.

Well, this is a mishmash, but it should compile, and show what I need it to show.

Code:

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <iomanip.h>
#include <stdio.h>

const int PLANE = 4, ROWS = 41, SEATS = 6;

void display (int [][ROWS][SEATS], int);
void forloop (int [][ROWS][SEATS], int);

int main ()
{
	int planebooker [PLANE] [ROWS] [SEATS] = {0};

        forloop(planebooker, PLANE);
        getch();
        display(planebooker, PLANE);
        return 0;
}

void display (int planebooker[][ROWS][SEATS], int x)
{
	int counter, seatnumber;
	// x is the plane, y is the row, z is the seats
		seatnumber = 1;
		cout << setw(26) << "1111111111" << "2222222222";
                cout << "33333333334" << endl;
		cout << setw(11) << "12345" << " " << "67890";
                cout << "1234567890" << "1234567890" ;
                cout << "1234567890" << endl;
		for (int z = 1 ; z < SEATS ; z++)
		{
			counter = 0;
			for (int y = 1 ; y < ROWS ; y++)
			{
				if (counter == 0)
					cout << setw(5) << seatnumber << " ";				
				if ((counter - 5) == 0)
					cout << " ";
				cout << planebooker [PLANE][ROWS][SEATS];
				counter++;
			}
			seatnumber++;
			cout <<	endl;
		}

		cout << setw(12) << " FIRST " << setw(20);
                cout  << "COACH" << endl;
		cout << setw(12) << " CLASS " << endl;
		getch();
}


void forloop (int planebooker[][ROWS][SEATS], int x)
{
		for (int x = 1 ; x < 4 ; x++)
		{
			for (int y = 1; y < 41 ; y++)
			{
				for (int z = 1 ; z < 6 ; z++)
				{
					planebooker [x][y][z] = 1;
				}
			}
		}
}

Sorry If I messed something up jammin it in there.

What are you trying to use x for?

Arrays start at 0.

Consider something like this.

Code:

#include <iostream>
using namespace std;

#define ROWS  4
#define SEATS 3
#define PLANE 2

void reserve(int planebooker [PLANE] [ROWS] [SEATS], int x, int y, int z)
{
   planebooker [x][y][z] = 1;
}

void display(int planebooker [PLANE] [ROWS] [SEATS])
{
   for ( int i = 0 ; i < PLANE; ++i )
   {
      for ( int j = 0 ; j < ROWS; ++j )
      {
         for ( int k = 0 ; k < SEATS; ++k )
         {
            cout << planebooker [i][j][k];
         }
         cout << ' ';
      }
      cout << '\n';
   }
}

int main()
{
   int planebooker [PLANE] [ROWS] [SEATS] = {0};
   display(planebooker);
   cout << "---\n";
   reserve(planebooker, 0, 0, 0);
   display(planebooker);
   return 0;
}

/* my output
000 000 000 000 
000 000 000 000 
---
100 000 000 000 
000 000 000 000 
*/

Look at this:

Code:

cout << planebooker [PLANE][ROWS][SEATS];

That doesn't print out the seat. It prints out an array index that's out of bounds of your array. You need the same x, y, z when you print out that you had in your forloop function.

Thanks for the replys. I would like to use your solution Dave, but alas, I don't even know what a lot of that is yet. Thanks Sly for pointing me at my obvious (yet blinding) error.