代写CS1026程序、Python编程调试、programming编程代写

日期：2021-02-12 11:43

CS1026: Assignment 1

Good Morning Canada!

Due: February 10th 2021, 9pm

Weight: 5%

>Learning Outcomes

By completing this assignment, you will gain skills relating to

? Basic Python programming constructs

? Expressions and decisions

? Getting input from users

? Validating input

? Algorithm development and testing; designing test cases

? Following program specifications.

>Tasks

In this assignment, you will write a complete program in Python that computes the cost of

breakfast at the Good Morning Canada! restaurant. Your program is expected to prompt the

user for input and validate it before computing the results. Your program will make use of

expressions, decisions, and input/output in Python. You should name your program

Assign1.py.

>Functional Specifications

1. The program will prompt the user for various pieces of information about the desired

breakfast. The required information is described below. Some of the information is

dependent on the type of breakfast being ordered. Once all the information has been

entered, the program will compute and display the amount of money (including tax)

charged for the customer’s breakfast.

2. The customer can build a custom breakfast from the following individual food and beverage

items: egg ($0.99 each), bacon ($0.49 per strip), sausage ($1.49 each), hash brown ($1.19

each), toast ($0.79 per slice), coffee ($1.49 per cup), and tea ($1.09 per tea bag). For

example, the customer can order two eggs with two pieces of toast and a cup of coffee.

3. Alternatively, the customer can order a small, regular, or big breakfast:

i. The small breakfast includes one egg, one hash brown, two slices of toast, two strips

of bacon, and one sausage.

ii. The regular breakfast includes two eggs, one hash brown and two slices of toast, four

strips of bacon, and two sausages.

iii. The big breakfast includes three eggs, two hash browns, four slices of toast, six strips

of bacon, and three sausages.

iv. The prices for these breakfast choices are based on the prices of the individual food

items that compose them.

v. The customer can add any of the food and drink items listed above to a small, regular,

or big breakfast order. For example, a customer may order a regular breakfast and

add a coffee and an additional sausage to it.

4. The program will display the available choices in the following way:

Enter item (q to terminate): small breakfast, regular breakfast, big

breakfast, egg, bacon, sausage, hash brown, toast, coffee, tea:

and the user will type the customer’s choice. For instance, if the customer wants a big

breakfast, the user will type: big breakfast <enter>. The program will then ask for the

quantity (how many big breakfasts). The program continues to ask for additional menu

items by re-displaying the choices. When the customer is done ordering, the user enters q,

the program then displays the pre-tax total, the tax, and the total with tax. Other scenarios

are possible, in which the customer decides to customize the breakfast order.

5. The program will compute the total cost of the order with additional taxes of 13%. All the

costs are to be rounded to the nearest penny, and displayed with a dollar sign and two

decimal positions. For example, a total cost of 13.66666 will be displayed as $13.67. All

numeric output should have 2 decimal places (e.g. 1.01, 0.00, etc).

6. The program will compute the prices for the small, regular, and big breakfast based on the

prices of the items that they include. You are not allowed to pre-compute the costs of these

breakfasts and then hard code these literal numbers in the program.

7. The program must be able to compute the total breakfast cost for an entire table of

customers. For example, three customers may be sitting at the same table, where customer

John orders the big breakfast with coffee, customer Jane orders the regular breakfast with

an extra two strips of bacon and tea, and customer Linda chooses to have two eggs with

two slices of toast and a strip of bacon. The user would enter the quantities for menu item,

e.g. 1 big breakfast, 1 regular breakfast, 1 coffee, 1 tea, 2 eggs, 2 slices of toast, 3 strips of

bacon.

8. The program must request user input in the same order as per the example runs below.

That is to say, the program will ask for the menu item and then for its quantity, not the

other way around.

9. Your program must accept inputs whether they contain upper-case or lower-case characters

(for example, BiG breaKfasT and big breakfast should both be accepted). Additionally,

your program must be robust to leading and trailing spaces, including cases when multiple

spaces separate words in input lines (for example small breakfast and small

breakfast should both be accepted). A Python function that performs this type of input

formatting is provided to you:

10. Your program must also detect and report invalid input; that is, the input must match one

of the keywords or phrases exactly (ignoring upper case and spaces). When an invalid input

is detected, the program will display an error message, and prompt for the input until the

user enters a correct input.

11. Your program must be robust to users entering input other than numbers when quantities

are requested. That is, you should input the string and validate that the input is numeric.

This can be done using isnumeric(). So to test whether the value of a variable quantity is

actually a number you can do quantity.isnumeric().This will return True if it is a number

and False otherwise.

12. Finally, an automated testing program will run a number of test cases against your program.

Some examples of output and test cases are presented below; these are NOT

comprehensive - you should create your own test cases and thoroughly test your

program.

def formatInput(textLine) :

textLine = textLine.lower().strip()

wordList = textLine.split()

textLine = " ".join(wordList)

return textLine

>Non-Functional Specifications

1. Include brief comments in your code identifying yourself, describing the program, and

describing key portions of the code.

2. Assignments are to be done individually and must be your own work. Software may be

used to detect academic dishonesty (cheating).

3. Use Python coding conventions and good programming techniques. For example:

? Meaningful variable names

? Conventions for naming variables and constants

? Use of constants where appropriate

? Readability, indentation, and consistency

The name of the file you will submit must be your Assign1.py.

Make sure you attach your Python source file to your assignment submission; do not put the

code inline in the textbox.

Make sure that you develop your code with Python 3.8 or 3.9 as the interpreter; failure to do so

may result in the testing program failing (see below).

>Marking of the Assignment

1. Your program will be executed by an automated testing program. This testing program

assumes that:

? The program name is Assign1.py .

? That you are using Python 3.8 or 3.9.

? That you have submitted it via OWL by uploading it.

Failure to adhere to these constraints will likely cause the testing program to fail. This may

require a remarking of your program which will include a 10% penalty.

2. Functional specifications:

? Does the program behave according to the specifications found in the assignment

document?

? Does the program handle invalid input?

? Is the output according to specifications? Has your program followed the

instructions for input and output?

3. Non-functional specifications as described above

>Example executions and output

Ordering a Small Breakfast (input displayed in green in all examples, for your convenience):

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: small breakfast

Enter quantity :1

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: q

Cost : 6.23

Tax : 0.81

Total : 7.04

Process finished with exit code 0

Ordering a Custom Breakfast:

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: egg

Enter quantity :2

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: toast

Enter quantity :2

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: hash brown

Enter quantity :1

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: coffee

Enter quantity :1

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: q

Cost : 6.24

Tax : 0.81

Total : 7.05

Process finished with exit code 0

Ordering for a Table of Three Customers:

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: big breakfast

Enter quantity :2

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: small breakfast

Enter quantity :1

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: coffee

Enter quantity :1

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: tea

Enter quantity :2

Enter item (q to terminate): small breakfast, regular breakfast, big breakfast, egg,

bacon, sausage, hash brown, toast, coffee, tea: q

Cost : 41.74

Tax : 5.43

Total : 47.17

Process finished with exit code 0