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#include "stdafx.h"
#include <iostream>
#include <utility>
using namespace std;
void FillSeatArray(pair<char, bool> arr[][4], int sizeDim1);
// Precondition: arr is a two dimensional array of type pair<char, bool>[4].
// sizeDim1 is the size of the first array dimesion.
// Postcondition: Each four element array of type pair<char, bool> is assigned values
// representing seats. The pair at index 0 is assigned 'A', 1 is assigned 'B',
// 2 is assigned 'C', and 3 is assigned 'D'. Each char value is paired with
// bool literal false to represent that the seat is empty.
void PrintSeats(pair<char, bool> arr[][4], int sizeDim1);
// Precondition: arr is a two dimensional array of type pair<char, bool>[4].
// sizeDim1 is the size of the first array dimesion.
// Postcondition: prints out a mapping of the current seats. A seat labeled
// with an X is unavailable.
pair<int, char> ChooseSeat(pair<char, bool> arr[][4], int sizeDim1);
// Precondition: arr is a two dimensional array of type pair<char, bool>[4].
// sizeDim1 is the size of the first array dimesion.
// Returns: a pair<int, char> object indicating a valid seat chosen by the user.
bool InvalidSeat(int rowChoice, char seatInRowChoice, pair<char, bool> arr[][4], int sizeDim1);
// Precondition: arr is a two dimensional array of type pair<char, bool>[4].
// sizeDim1 is the size of the first array dimesion. rowChoice is the desired row, seatInRowChoice
// is the desired seat choice.
// Returns: true if the values rowChoice and seatInRowChoice indicate a valid, unoccupied seating position.
// Valid seating positions are rowChoice 1-sizeDim1 and seatInRowChoice 'A'-'D'.
void ReserveSeat(pair<char, bool> arr[][4], pair<int, char> desiredSeat);
// Precondition: arr is a two dimensional array of type pair<char, bool>[4].
// desiredSeat is the row and seat of which to reserve.
// Poscondition: finds the representation of desiredSeat in arr and sets that value's
// bool value to true, indicating the seat is now reserved.
int SeatToIndex(char seatInRow);
// Precondition: seatInRow is a valid choice, 'A'-'D'.
// Returns: index 0-4 correspoding to each char 'A'-'D'.
int main()
{
bool reservingASeat = true;
const int ROWS = 7, SEATS_PER_ROW = 4;
pair<char, bool> seats[ROWS][SEATS_PER_ROW];
FillSeatArray(seats, ROWS);
cout << "Welcome to the airline reservation system!\n\n";
while (reservingASeat)
{
pair<int, char> desiredSeat = ChooseSeat(seats, ROWS);
ReserveSeat(seats, desiredSeat);
PrintSeats(seats, ROWS);
char ans;
do
{
cout << "Would you like to reserve another seat? (y/n): ";
cin >> ans;
cout << endl;
} while (ans != 'y' && ans != 'Y' && ans != 'n' && ans != 'N');
if (ans == 'n' || ans == 'N')
reservingASeat = false;
}
return 0;
}
void FillSeatArray(pair<char, bool> arr[][4], int sizeDim1)
{
for (int i = 0; i < sizeDim1; ++i)
{
for (int j = 0; j < 4; ++j)
{
switch (j)
{
case 0:
arr[i][j] = make_pair('A', false);
break;
case 1:
arr[i][j] = make_pair('B', false);
break;
case 2:
arr[i][j] = make_pair('C', false);
break;
case 3:
arr[i][j] = make_pair('D', false);
break;
}
}
}
}
void PrintSeats(pair<char, bool> arr[][4], int sizeDim1)
{
for (int i = 0; i < sizeDim1; ++i)
{
cout << i + 1 << " ";
for (int j = 0; j < 4; ++j)
{
cout << ((arr[i][j].second == false) ? arr[i][j].first : 'X');
}
cout << endl;
}
cout << endl;
}
pair<int, char> ChooseSeat(pair<char, bool> arr[][4], int sizeDim1)
{
cout << "Current seating status:\n\n";
PrintSeats(arr, sizeDim1);
cout << endl;
int row;
char seatInRow;
do
{
cout << "Choose a row (1-7): ";
cin >> row;
cout << "Choose a seat (A-D): ";
cin >> seatInRow;
cout << endl;
seatInRow = ::toupper(seatInRow);
} while (InvalidSeat(row, seatInRow, arr, sizeDim1));
return make_pair(row, seatInRow);
}
bool InvalidSeat(int rowChoice, char seatInRowChoice, pair<char, bool> arr[][4], int sizeDim1)
{
int row = rowChoice - 1;
if (rowChoice <= 0 || rowChoice > sizeDim1)
{
cout << "Invalid row choice.\n\n";
return true;
}
else if (seatInRowChoice < 'A' || seatInRowChoice > 'D')
{
cout << "Invalid seat choice.\n\n";
return true;
}
else if (arr[row][SeatToIndex(seatInRowChoice)].second == true)
{
cout << "Seat " << rowChoice << seatInRowChoice << " is occupied.\n\n";
return true;
}
return false;
}
void ReserveSeat(pair<char, bool> arr[][4], pair<int, char> desiredSeat)
{
int row = desiredSeat.first - 1;
int seatInRow = SeatToIndex(desiredSeat.second);
arr[row][seatInRow].second = true;
cout << "Seat " << desiredSeat.first << desiredSeat.second << " reserved.\n\n";
}
int SeatToIndex(char seatInRow)
{
switch (seatInRow)
{
case 'A':
return 0;
case 'B':
return 1;
case 'C':
return 2;
case 'D':
return 3;
default:
cerr << "Invalid value: desiredSeat.second, ReserveSeat\n\n";
exit(1);
}
}
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