ITECH1400 - Assignment - Supermarket Self-Service Checkout: Class Design and Implementation

ITECH1400 – Foundations of Programming
School of Science, Engineering and Information Technology
ITECH1400 - Assignment – Supermarket Self-Service Checkout
Assignment Part 1 Details – Class Design
Product Properties (All)
Barcode Name Price Weight
001 handset 32.0 1.4
002 hardware 34.01 2.5
003 drive 231.90 1.4
004 Mobile 36.0 0.5
005 fan 74.50 2.0
006 PC 59.0 1.8
007 notebook 12.50 0.5
008 Compact disk 17.90 1.10
009 ROM 523.50 2.90
Product Properties (Key)
Barcode Name Price Weight
Product Class Diagram
Product
+ pro_barcode:var=var
+ pro_name:var=var
+ pro_price:var=var
+ pro_weight:var=var
+ product_item_list = []
+_init_()
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ITECH1400 – Foundations of Programming
School of Science, Engineering and Information Technology
CheckoutRegister Class Diagram
CheckoutRegister
+ remainingPayment_amount:var = 0
+ some_money:var = 0
+ MAX_BAG_WEIGHT = 5.0
+__init__(self)
+ can_item(self,product_barcode)
+ accept_payment(self,some_money)
+ print_receipt(self)
+ bag_products(self,product_list)
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ITECH1400 – Foundations of Programming
School of Science, Engineering and Information Technology
Assignment Part 2 – Activity Flowchart
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ITECH1400 – Foundations of Programming
School of Science, Engineering and Information Technology
Assignment Part 3 – Software Implementation
Figure 1 Output
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ITECH1400 – Foundations of Programming
School of Science, Engineering and Information Technology
Figure 2 Output
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ITECH1400 – Foundations of Programming
School of Science, Engineering and Information Technology
Assignment Part 4 – Code Explanation and Use
1. # make a function for accept_payment from customers for their shopping of items
defget_float(prompt):
2. # define variable with float value 0.0
value= float(0.0)
3. # run while loop till condition is true for accept payment
whileTrue:
a. try:
i. # input for amount due after accepting payment and give back remained amount to customer
value= float(input(prompt))
ii. # check condition for negative values of amount using if loop
if value < 0.0:
print("We don't accept negative money!")
continue
iii. # if this condition matches then jump from this loop to next step
break
b. # exception handling for value error
exceptValueError:
print('Please enter a valid floating point value.')
4. # pass the total amount where this function called for shopped product by customers
return value
# make a function for bag_products to append the items from the shopped item list to bag_list until weight of bag is less than
and equal to the MAX_BAG_WEIGHT
# extra items move to non_bagged_list
5. defbag_products(product_list):
6. # make a list of bag_list, non_bagged_items and set max weight to 0.5
bag_list=[]
non_bagged_items=[]
MAX_BAG_WEIGHT = 5.0
6. # run for loop for products in product list
for product inproduct_list:
7. # check for condition using if-else for pro_weight > MAX_BAG_WEIGHT and do removing or appending of items
from product_list and non_bagged_items
ifproduct.weight> MAX_BAG_WEIGHT:
product_list.remove(product)
non_bagged_items.append(product)
8. # make a list for current_bag_contents and 0.0 value for current_bag_weight
current_bag_contents=[]
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ITECH1400 – Foundations of Programming
School of Science, Engineering and Information Technology
current_bag_weight= 0.0
9. # run while loop for given condition
whilelen(product_list)> 0:
10. # swapping of values and remove temporary product after swap from product_list
temp_product=product_list[0]
product_list.remove(temp_product)
11. # check for given condition using if-else conditions
ifcurrent_bag_weight+temp_product.weight< MAX_BAG_WEIGHT:
12. # add temporary_product into current_bag_contents
current_bag_contents.append(temp_product)
current_bag_weight+=temp_product.weight
13. # check length of product list using if condition which is equal to 0 add append to current_bag_contents
if(len(product_list)== 0):
bag_list.append(current_bag_contents)
14. # otherwise if product list is not empty then append to current bag contents
else:
bag_list.append(current_bag_contents)
15. # enumerate(bag_list ) adds a counter to an iterate
for index, bag in enumerate(bag_list):
output= 'Bag ' +str(index + 1)+ ' contains: '
16. # show products which are in bag
for product in bag:
output+= product.name + '\t'
print(output, '\n')
17. # check condition using if loop for non_bagged_items length should not be greater than 0
if(len(non_bagged_items)> 0):
output= 'Non-bagged items: '
18. # for loop to print non_bagged_items
for item innon_bagged_items:
output+= item + '\t'
print(output,'\n')
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