How do I do this program?

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Hi. I am taking a C++ program class and do not understand what I am doing and my instructor is no help so that is why I am here. I just can't seem to grasp any concepts and I don't know why. Can someone please help me with this:

Bluebird Airlines has flights from Phoenix to six other cities in Arizona. The
cities are referred to by number,1 to 6.The price for a round-trip ticket to each of
the cities is shown here.

City 1 2 3 4 5 6

Price 56.79 105.69 93.49 155.99 87.49 73.99

Write a program that computes the total price of tickets that a customer orders.
The program should prompt the user for the number of the destination city and
the number of tickets desired.If the user enters an invalid city number,the pro-
gram should display an error message and terminate.The program should display
the total price of the ticket order.Use an array to store the ticket price table.

Any help would be greatly appreciated.

Thanks,

Mary :)

Posted 21-Feb-14 15:27pm

mjlohr0033

Updated 21-Feb-14 15:36pm

Krunal Rohit

v2

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[no name] 21-Feb-14 22:05pm

Do you have a plan or are you just going to dump it in someone else's lap? Have you compiled and run a "Hello world" program?

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Andreas Gieriet · Accepted Answer · 2014-02-21T17:19:00

First of all you need to understand the task at hand.

write the use cases in your own words, e.g.

Normal Use Case
- start the program on the command prompt (this is not a program that shows a graphical user interface but only asks some user input from the command prompt), e.g.
```
Please enter a city code in the range 1 to 6: _
```
- enter a number between 1 and 6 (representing one of the available cities), e.g.
```
Please enter a city code in the range 1 to 6: 3
Please enter the number of tickets in the range 1 to 20: _
```
- enter a number between 1 and say 20 (representing the number of tickets to buy)
- the program calculates the total price of the tickets to the selected city, e.g. double total = getTicketPrice(cityId) * numberOfTickets
- the program displays the result, e.g.
```
Please enter a city code in the range 1 to 6: 3
Please enter the number of tickets in the range 1 to 20: 2

The total price of the 2 tickets to 'city 3' is 2 x 93.49 = 186.98
```
Error Use Case
- start the program on the command prompt, e.g.
```
Please enter a city code in the range 1 to 6: _
```
- enter a number that is out of range, e.g. 0 (or -3, or 7, or 100)
```
Please enter a city code in the range 1 to 6: 0
```
- the program reports an error and terminates, e.g.
```
Please enter a city code in the range 1 to 6: 0

Error: You entered a city code that is out of range. Please enter a code in the range 1 to 6.
```

Translate the use cases into some pseudo-code (some data structures and control flow that mimics the use cases), e.g.

ticketPrice is array with values 56.79 105.69 93.49 155.99 87.49 73.99, each position represents one city: first = ticket price for city 1, second = ticket price for city 2, etc.

set maxCityCode to the number of elements in the array

write to the console: Please enter a city code in the range 1 to maxCityCode: 

read some number from the console and store in cityCode

check if the entered code is in the range 1 to maxCityCode and if out of range, write the above mentioned error message to the console and exit the program with error code

write to the console: Please enter the number of tickets in the range 1 to maxTickets: 

read some number from the console and store in tickets

optional: check if the entered number is in the range 1 to maxTickets and if out of range, write some error message analogous to the one above and exit the program with error code

calculate: price = the ticketPrice entry for cityCode

calculate: totalPrice = tickets times price

write to console: The total price of the tickets tickets to 'city cityCode' is tickets x price = totalPrice

exit the program with success code

translate this into C++ (read any basic tutorial on Hello World C++ programs - they contain all you need to know about C++ for this homework assignment)
test and fix and test...

Have fun!
Cheers
Andi

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2014-02-21T18:12:00

Solution 2

Quote:
I just can't seem to grasp any concepts and I don't know why.

Then how could we know?

Here we answer specific questions which members face during programming.
If you face any difficulty while coding, feel free to come back here and ask another question with specific issue describing the scenario.

Members will be happy to help you then. :)

Posted 21-Feb-14 18:12pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

mjlohr0033 22-Feb-14 7:52am

Thanks everyone for your input and help. Every comment has some very valuable points. I really do appreciate your input and will apply each and every one of them.

Thanks again!!

Mary ;)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 22-Feb-14 11:19am

Most welcome. :)