Solved-Lab 3! -Solution

Description

Activity 1. In this activity, you will get to practice on input, output, variables, and types. You will have to implement the solution code of the exercise that is described below:

Example: Imagine a client wants to buy 25 software packages. The client will get a 30% discount. The regular price would have been: $2,475 but the discounted price is now: $1,732.5.

Pseudocode of the solution:

Ask the client for the number of packages s/he wants to buy Retrieve this number using some kind of a listener and store it in an integer variable called numSoftware If the value stored in numSoftware is 9 or less, then store the real value 0 in a variable called discount If the value stored in numSoftware is between 10 and 19, then store the real value 0.2 in a variable called discount If the value stored in numSoftware is between 20 and 49, then store the real value 0.3 in a variable called discount If the value stored in numSoftware is between 50 and 99, then store the real value 0.4 in a variable called discount If the value stored in numSoftware is 100 or more, then store the real value 0.5 in a variable called discount Compute the following: 99 * numSoftware * (1 – discount) and store this value in a real variable called discountedPrice Display the value of the discount by outputting what is stored in your variable called discount Display the price the client has to pay by outputting what is stored in your variable called discountedPrice

Another version would allow you to revise the price of each software package much more easily. It would read as follows (the modification is in bold):

Store the price of each software package in a (integer or real, you pick) constant called softwareUnitPrice Ask the client for the number of packages s/he wants to buy Retrieve this number using some kind of a listener and store it in an integer variable called numSoftware If the value stored in numSoftware is 9 or less, then store the real value 0 in a variable called discount If the value stored in numSoftware is between 10 and 19, then store the real value 0.2 in a variable called discount If the value stored in numSoftware is between 20 and 49, then store the real value 0.3 in a variable called discount If the value stored in numSoftware is between 50 and 99, then store the real value 0.4 in a variable called discount If the value stored in numSoftware is 100 or more, then store the real value 0.5 in a variable called discount Compute the following: softwareUnitPrice * numSoftware * (1 – discount) and store this value in a real variable called discountedPrice Display the value of the discount by outputting what is stored in your variable called discount Display the price the client has to pay by outputting what is stored in your variable called discountedPrice

Instructions:

1. Design (5) scenarios of usage of your (pseudo)code: for this, provide a user input (number of software packages to be purchased) and show the expected output.
   1. Provide these scenarios in a docx file named “yourLastName-yourFirstName-lab3.docx”

Note: sets of scenarios that cover the most aspects of the code will be rewarded with extra points.

2. Modify the provided code where prompted to make sure that the code follows either of the two above versions (specify as a comment in your code, which one you chose).

Now, here is what you have to turn in:

1. The java file with the completed code for method called SoftwareSales.
2. A docx file in which you have described scenarios as prompted above.

Activity 2. In this activity, you will get to practice some more on variables and type. You will have to implement the solution code of the exercise that is described below:

Example: If originally Zoe has $100 and Gonzague 200 euros, then at the end, Zoe should have the equivalent of 200 euros in dollars in her piggybank (let’s say, about $222) and Gonzague should have the equivalent of $100 in euros in his piggybank (let’s say, about 89 euros).

Special requirement of the code you have to write: Very expectedly, you will need to define variables to hold the amount of dollars / euros that Zoe and Gonzague respectively own: please specify these variables to be of type double. So that’s two double variables.

Now you might be tempted to define two new variables to hold the new amounts that each person owns. There would then be 4 double variables. In this lab activity, we do not want to allow you to do this (remember, we are concerned about memory usage and we believe we can do better than that!): you are only allowed to use 3 double variables in total in this piece of code.

Pseudocode of the solution: We hereafter provide you with part of the pseudocode. One of the instructions for this activity will consist in completing this pseudocode.

Parts of the pseudocode that are missing are flagged as “**???**”.

Note: We will assume that the currency conversion between euros and dollars is fixed to the following: 100 euros = 111 dollars

Ask the user to enter the amount of dollars that Zoe owns Retrieve this amount using some kind of a listener and store it in a double variable called Zoe Ask the user to enter the amount of euros that Gonzague owns Retrieve this amount using some kind of a listener and store it in a double variable called Gonzague Display the original amount of dollars of Zoe Display the original amount of euros of Gonzague Create a new variable of type double, called **???** **???** **???** **???** Display the value stored in Zoe as the amount that Zoe now owns in dollars Display the value stored in Gonzague as the amount that Gonzague now owns in euros

Instructions:

1. Complete the above pseudocode in the same docx file as the one you started for activity 1.
2. Complete the provided code where prompted to make sure that the code follows your pseudocode.
3. Provide, in the docx file, a command line execution of the program (see example below) for the following three scenarios:
   1. Zoe has $200 and Gonzague has 100 euros
   2. Zoe has $150 and Gonzague has 20 euros
   3. Zoe has $80.50 and Gonzague has 323.40 euros

Example of command line execution:

Do make sure that your code actually executes exactly the way it shows above. Failing to comply will sadly result in points off.

Now, here is what you have to turn in:

1. The docx file with completed pseudocode and the command line executions
2. The java file with the completed program tradingPiggyBanks.

That’s it! Looking forward to seeing you in lab!