Question

C++ Help please- kind of long.

The aim is to implement a seat reservation system for a passenger airplane. We assume a small airplane with 10 rows and 4 seats per row. We assume that the seat chart is initially stored in a file “chartIn.txt” in the following format:

1   A B C D

2   A B C D

3   A B C D

4   A B C D

5   A B C D

6   A B C D

7   A B C D

8   A B C D

9   A B C D

10 A B C D

The example given above means that seats 1A, 1B, 1C, 1D, 2A, 2B, 2C, 2D, 3A, … are all available. Note that the number 1, 2, 3 … also belong to the file.   Below is another example of data stored in the file “chartIn.txt”:

1   A X C D

2   A B C D

3   A B C D

4   A B C D

5   A X C D

6   A B C D

7   A B C D

8   A B C D

9   A B X D

10 A X X D

This second example demonstrates that the following seats marked with ‘X’ are reserved: 1B, 5B, 9C, 10B, 10C.

The program must use a function to initially read the seat chart from the file “chartIn.txt” and fill out a 2-dimentional array called seatChart. The main program then calls a function to display the following menu:

------------------------ Menu ---------------------------

1. Display Seat Chart

2. Reserve Seat

3. Cancel Reservation

4. Quit

----------------------------------------------------- ---

Please Enter Your Choice (1-4):

Below is a description of each option in the menu:

• Option 1 (Display Seat Chart): The program calls a function that displays the seat chart from the array seatChart using the format shown in page 1.
• Option 2 (Reserve Seat): The program calls a function that prompts users for the seat desired as a string (e.g., 3A, 7D, etc.) and then determines the row number and column number of the array element that needs to be accessed. If the seat is available, it reserves it by assigning ‘X’ to the seat and displays a message stating that the seat was reserved. Otherwise it displays a message stating that the seat is not available.
• Option 3 (Cancel Reservation): The program calls a function that prompts users for the seat to be canceled as a string (e.g., 3A, 7D, etc.) and then determines the row number and column number of the array element that needs to be accessed. If the seat is available, the program displays an error message stating that the seat to be canceled has not been initially reserved. Otherwise it makes the seat available and displays a message stating that the seat reservation has been cancelled.
• Option 4 (Quit): The program displays a thank you message and terminates.

Component 1:   Software System Design

Use the function decomposition method to describe all functions that you will implement in this project. Use arrow lines to indicate the relationship among all functions, and their calling sequence.

Component 2:   Software Documentation

Precede each function with the following standard information:

//   Purpose: …

//   Author: ….

//   Creation Date: …

//   Last Modification Date: …

Also, include a comment at the beginning of the entire program with the following information:

//   Purpose: …

//   Author: ….

//   Creation Date: …

//   Last Modification Date: …

Component 3: Program Extension

Extend your program to process airplanes of any size (any number of rows and columns).

Answer 1

#include<iostream.h>
char seat[10][4]; //creating a array for seats

//function to display seat details
void displaySeat()
{
   for(int i=0;i<10;i++)
   {
       cout<<"\n"<<i+1<<" ";
       for(int j=0;j<4;j++)
       {
           cout<<seat[i][j]<<" ";
       }
   }
}

//function to reserve seat
void reserveSeat()
{
   char s[4];
   cout<<"\nEnter the desired seat:";
   cin>>s;
   int i,n,r;
   int c;
   i=n=0;
   while(s[i]!='\0')
   {
       n++;
       i++;
   }
   if(n==3)
   {
       r=9;
       c=s[2]-65;
   }
   else
   {
       r=s[0]-61;
       c=s[1]-65;
   }
   if(seat[r][c]=='X')
   {
       cout<<"\nThe seat is already reserved!";
   }
   else
   {
       seat[r][c]='X';
       cout<<"\nThe seat has been reserved successfully!";
   }
}

//function to cancel ticket
void cancel()
{
   char s[4];
   cout<<"\nEnter the seat to cancel:";
   cin>>s;
   int i,n,r;
   int c;
   i=n=0;
   while(s[i]!='\0')
   {
       n++;
       i++;
   }
   if(n==3)
   {
       r=9;
       c=s[2]-65;
   }
   else
   {
       r=s[0]-61;
       c=s[1]-65;
   }
   if(seat[r][c]=='X')
   {
       seat[r][c]=65-c;
       cout<<"\nThe seat is cancelled successfully!";
   }
   else
   {
       cout<<"\nThe seat is not yet reserved to cancel!";
   }
}
void main()
{
  
   for(int i=0;i<10;i++)
   {
       seat[i][0]='A';
       seat[i][1]='B';
       seat[i][2]='C';
       seat[i][3]='D';
   }
   int ch;
   do{
       cout<<"\n-------------Menu------------";
       cout<<"\n1. Display Seat Chart\n2. Reserve Seat\n3. Cancel reservation\n4. Quit";
       cout<<"\n-----------------------------";
       cout<<"\nPlease Enter your Choice(1-4):";
       cin>>ch;
       switch(ch)
       {
           case 1:
               displaySeat();
          
           break;
           case 2:
               reserveSeat();
           break;
           case 3:
               cancel();
           break;
           case 4:
               cout<<"\nThank You!";
           break;
           default:
               cout<<"\nInvalid Choice";
           break;
       }
   }while(ch!=4);
}