Question

In this lab you will implement tickets-for-seat-management system. The basic idea is that your program reads an event number and seat number request from a user, and determines if the seat is available (and marks it taken if it was), or is unavailable (so asking the user to choose again). As part of that exercise, you’ll be working with a file of “canned” requests to exercise your program. That is, instead of typing the requests in to your program, the program will read ‘typed in’ requests from a file.

Fortunately for you, linux (also MacOS) provides a trivial way for you to do this without making any changes to your program. Your programs have been reading using cin and writing using cout. linux understands these as, in its terminology, stdin and stdout respectively. Normally, stdin is ‘mapped’ to your keyboard, so what you type shows up as coming from stdin, hence available to your program with cin. Similarly, stdout is mapped to the window where you see output.

You can change this mapping: you can redirect stdin to be any file you have on your computer. So, if you run your interactive program by typing:

a.out

then you can run your program and have it read from a file using:

a.out < my_infile
where the input that would have been typed in on the keyboard is already in your file my_infile.

You can do the same thing for redirecting stdout: you can cause output that would normally appear on your screen to go, instead, to a file:

a.out > my_outfile creates, or rewrites, my_outfile
a.out >> my_outfile creates, or appends to existing my_outfile.

And, of course, you can redirect both input and output:

a.out < my_infile > my_outfile

2. Booking Seats

The program you write handles availability of seats in a 250-seat auditorium for an event taking place on five consecutive days (1st, 2nd, 3rd, 4th,and 5th of the month). You need to use a two-dimensional array to model the seats: one dimension is the date, the other is the seat number.

Before ticket sales begin, you have to mark all the seats for all days as available.

Then you go into a loop asking a user for the day number (1..5) and seat number they want, check if the seat is available, and either mark it taken now (and confirm to the user they have the seat), or, tell them it’s unavailable and they should choose again. Each line of input to your program contains two numbers separated by exactly one space: you can re-use some of the code you wrote for lab 6 where you read input lines using getline() and separated two variables from the string you read in.

Note that customers expect seat numbers to range 1..250 but since your array uses 0..249 you’ll need to ‘adjust’ the seat number selected by the user. Analogously users will expect day numbers to range 1..5 which you’ll need to adjust to 0..4 for your array.

When you prompt the user, the program must provide the range of date numbers and seat numbers from which to choose, and check that the user provided valid input in each case.

Test your program on some data you type in to ensure that it correctly handles:

1. getting a seat that’s available,

2. not getting a seat if it’s already taken,

3. bogus date and/or seat numbers from the user. You should also test your program on the test data

   file available on-line.

Answer 1

#include<iostream>
using namespace std;

bool seats_available[5][250];

void bookSeat(bool seats_available[5][250]);
int main(){

int i=0,j=0;
for(i=0;i<5;i++){
for(j=0;j<250;j++){
seats_available[i][j]=true;
}
}
bookSeat(seats_available);
// bookSeat(seats_available);

}
void bookSeat(bool seats_available[5][250]){
repeat:
int r,c;
cout<<"Choose the event day from 1-5 ";
cin>>r;
while(r>5||r<1){
cout<<"Choose the event day from 1-5 ";
cin>>r;
}
cout<<endl<<"Choose seat number from 1-250 ";
cin>>c;
while(c<1||c>250){
cout<<endl<<"Choose seat number from 1-250 ";
cin>>c;
}
if(seats_available[r-1][c-1]==true)
{
seats_available[r-1][c-1]=false;
cout<<"Your booking is complete"<<endl;
}
else{
cout<<"Sorry, this seat is not available. Please choose another seat"<<endl;
goto repeat;
}
}