Problem Description
Codu wants to create a shopping application. The application would sell only SHIRT and SHOE and have a cost that can be modified based on market needs. This application should allow users in two roles, viz. store manager(SM) and shopper(S).
Codu wants to test the app. He wants the application to execute a few commands and print the output.
Following is the list of allowed commands:
CMD SM ADD [ITEM NAME] [ITEM QTY] – adds the given quantity of the item to the inventory and prints(returns) the quantity added, otherwise prints -1 when there is any error or invalid input. Item qty can only be whole numbers > 0. CMD SM REMOVE [ITEM NAME] – removes the item from the inventory, returns and prints -1 when there is an error, otherwise prints(returns) 1. CMD SM GET_QTY [ITEM NAME] – returns and prints the currently available quantity for the item in the inventory, otherwise prints(returns) 0 in case the item is not found. CMD SM INCR [ITEM NAME] [ITEM QTY] – adds the given quantity of the item to the inventory and prints(returns) the quantity added, otherwise prints(returns) -1 when there is any error or invalid input. item qty can only
be whole numbers > 0.
CMD SM DCR [ITEM NAME] [ITEM QTY] – removes the given quantity of the item from the inventory and prints(returns) the quantity added, otherwise prints(returns) -1 when there is any error or invalid input. item qty can only be whole numbers > 0. CMD SM SET_COST [ITEM NAME] [COST] – sets the cost of the item, returns the value, otherwise prints -1 in case of any errors or invalid input. Cost must be decimal.
CMD S ADD [ITEM NAME] [ITEM QTY] – adds the given quantity of the item
to the shopping cart and prints(returns) the quantity added, otherwise
prints -1 when there is any error or invalid input. Item qty can only be
whole numbers > 0.
CMD S REMOVE [ITEM NAME] – removes the item from the shopping cart, returns and prints -1 when there is an error, otherwise prints(returns) 1.
CMD S INCR [ITEM NAME] [ITEM QTY] – adds the given quantity of the item to the shopping cart and prints(returns) the quantity added, otherwise prints(returns) -1 when there is any error or invalid input. item qty can only be whole numbers > 0.
CMD S DCR [ITEM NAME] [ITEM QTY] – removes the given quantity of the item from the shopping cart and prints(returns) the quantity added, otherwise prints(returns) -1 when there is any error or invalid input. item qty can only be whole numbers > 0.
CMD S GET_ORDER_AMOUNT – gets the total price of the items in the cart, returns the value, otherwise prints -1 in case of any error or invalid input. The total amount should be rounded and printed up to two decimal places.
NOTE– Increment and Decrement operations are only possible when the
item is already in the inventory or cart. If increment or decrement is
attempted on items that do not exist in the cart, then the command should
return and print -1.
If an attempt is made to add an item that is already in the inventory or cart,
such operations should result in an error and must return and print -1.
If an item which is present in the cart or inventory is removed using
remove command and an increment or decrement operation is performed
on it, such operations should result in an error and must return and print
-1.
If any item quantity after decrement becomes zero, the same is removed from the corresponding inventory or cart. Performing increment or decrement operation after such a previous decrement operation, should result in an error and return -1.
You need to think of other similar error conditions while implementing the solution.
Please note at the beginning of a test case or command set, both the
inventory as well as the cart is empty.
Here,
SM= STORE MANAGER
S= SHOPPER
You are required to create the application for Codu to manage the
shopping kiosk.
The first line of input T, gives the number of test cases.
Each test set is a set of commands, which ends with “END” string.
Each command in a test case is on a new line
Constraints
1<=T<=10
First line contains an integer T, which denotes the number of test cases
Second line onwards, there will be commands until we receive END
command. Any command after the END command belongs to next test
case.
Output
Print output of every command. (Print double value for command
SET_COST(rounding to one decimal places) and
GET_ORDER_AMOUNT(rounding to two decimal places) )
Examples
Example 1
Input
1
CMD SM SET_COST SHOE 5
CMD SM SET_COST SHIRT 10
CMD SM ADD SHOE 5
CMD SM ADD SHIRT 10
CMD SM DCR SHIRT 5
CMD SM INCR SHOE 5
CMD SM GET_QTY SHIRT
CMD SM GET_QTY SHOE
CMD SM REMOVE SHIRT
CMD SM GET_QTY SHIRT
CMD S ADD SHOE 2
CMD S INCR SHOE 2
CMD S DCR SHOE 1
CMD S GET_ORDER_AMOUNT
END
5.0
10.0
5
10
5
5
5
10
1
0
2
2
1
15.00
Explanation :
From commands “CMD SM SET_COST SHOE 5” and “CMD SM SET_COST
SHIRT 10″
We are successfully setting the cost as 5.0 and 10.0 respectively.
From next commands “CMD SM ADD SHOE 5” and “CMD SM ADD SHIRT
10″
Quantity of 5 shoes and 10 shirts has been successfully added to the
inventory.
From next commands “CMD SM DCR SHIRT 5″” and “CMD SM INCR SHOE
5″
Shirt quantity is decremented by 5 and shoe quantity is incremented by 5.
This leaves us with 5 shirts and 10 shoes in the inventory.
From next commands “CMD SM GET_QTY SHIRT” and “CMD SM
GET_QTY SHOE”
We are getting the quantity of shirt and shoe, which is 5 and 10
respectively.
From next command “CMD SM REMOVE SHIRT”
Shirt is removed from the inventory and hence 1 is printed.
From next command “CMD SM GET_QTY SHIRT”
We are querying the quantity of shirt, which is 0 as it was removed in the
previous command.
From next command “CMD S ADD SHOE 2”
Shopper adds two shoes to the cart hence 2 is printed.
From next commands “CMD S INCR SHOE 2” and “CMD S DCR SHOE 1”
The user increments these shoes by 2 and then decrements by 1 hence 2
and 1 are printed. SO current shoes in cart= 2+2-1=3
From next commands “CMD S GET_ORDER_AMOUNT”
The next command asks to print order amount or cart value, which is the
cost of shoes * the number of shoes=5*3=15 hence 15.00 is printed by
rounding to two decimal places.
Recommended: Please try your approach on your integrated development environment (IDE) first, before moving on to the solution.
Few words from CodingHumans : Don't Just copy paste the solution, try to analyze the problem and solve it without looking by taking the the solution as a hint or a reference . Your understanding of the solution matters.
HAPPY CODING 😁
( Python )
Note: You can use object oriented concept to solve this problem in better way.
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