#include <iostream>
using namespace std;

#define SEATS_PER_SECTION 5
#define NUMBER_OF_SECTIONS 3

int checkSeats( const int*, const int );

int main()
{
        int seats[NUMBER_OF_SECTIONS][SEATS_PER_SECTION], numSelection, seatUsed;
        char *sections[] = {
                "First",
                "Economy",
                "Baggage"
        };

        char selection;

        // Initialize array
        memset( seats, '\0', sizeof( seats ) );

        do {
                cout << "Which class of seating would you like (enter a number 1 through " << NUMBER_OF_SECTIONS << ")?" << endl;
                cin >> numSelection;
        } while( numSelection < 1 || numSelection > NUMBER_OF_SECTIONS );

        // Convert to 0 based offset
        do {
                seatUsed = checkSeats( seats[ numSelection - 1 ], SEATS_PER_SECTION );
                if( seatUsed ){
                        cout << "You have been placed in " << sections[ numSelection - 1 ] << " Class seat number " << seatUsed << "." << endl;
                        cout << "Thanks for flying!" << endl;
                        break;
                } else {
                        if( numSelection < NUMBER_OF_SECTIONS ){
                                do {
                                        cout << "All " << sections[ numSelection - 1 ] << " Class seats are taken!  Would you like a seat in " << sections[ numSelection ] << " Class? (y/n)?";
                                        cin >> selection;
                                } while( selection != 'y' && selection != 'n' );
                                if( selection == 'y' ){
                                        numSelection++;
                                } else {
                                        break;
                                }
                        } else {
                                cout << "It appears that there are no more seats available." << endl;
                                break;
                        }
                }
        } while( numSelection < NUMBER_OF_SECTIONS );
}

int checkSeats( const int* section, const int section_seat_count  )
{
        int i, seatFound = 0;
        for( i = 0; i < section_seat_count; i++ ){
                if( section[i] == 0 ){
                        seatFound = ( i + 1 );
                        break;
                }
        }
        return( seatFound );
}