IPC144- Workshop 2 Solved

In this workshop, you will code and execute a C-language program that accepts numerical values from the user, stores the values in variables of appropriate data type, performs calculations on the stored variables and casts from one data type to another. 

LEARNING OUTCOMES
Upon successful completion of this workshop, you will have demonstrated the abilities: 

•      to declare variables of integral and floating point types 

•      to code a simple calculation using C operators and expressions  

•      to accept a numerical value from the user using scanf 

•      to cast a value from one data type to another 

•      to describe to your instructor what you have learned in completing this workshop 

 

IN_LAB: DONE IN CLASS (30%)
Download or clone workshop 2 (WS02) from https://github.com/Seneca-144100/IPCWorkshops 

In the in_lab directory of workshop 2, right-click on the file in_lab.vsxproj and select the “Open With” context menu item then select “Microsoft Visual Studio 2017” to open the workshop in Visual Studio. 

In the Visual Studio solution explorer panel, open and write your code in cashRegister.c for workshop 2. 

Start the program by asking the user to enter the amount due. Print the following message: 

Please enter the amount to be paid: $ 

Assume the user enters 8.68, this is what the screen should look like: 

            (<ENTER means hitting the enter key) 

Please enter the amount to be paid: $
8.68 <ENTER
Read the amount due and store it as a double. 

Calculate the number of loonies and quarters required to pay the amount due and display the following: 

Loonies required: 8, balance owing $0.68 Quarters required: 2, balance owing $0.18 Execution and Output Example: 

Please enter the amount to be paid: $8.68 

Loonies required: 8, balance owing $0.68 

Quarters required: 2, balance owing $0.18 

For submission instructions, see the SUBMISSION section below. 

IN_LAB SUBMISSION: 

To test and demonstrate execution of your program use the same data as the output example above. 

If not on matrix already, upload your cashRegister.c to your matrix account. Compile and run your code and make sure everything works properly. 

 

AtThePrompt gcc -Wall cashRegister.c –o ws<ENTER 

 

-Wall activates the display of warnings in GCC compiler. 

-o sets the executable name (ws) 

Then run the following script from your account: (replace profname.proflastname with your professors Seneca userid and replace SAA with your section) 

 

~profname.proflastname/submit 144SAA_w2_lab <ENTER  

 

and follow the instructions. 

 

AT_HOME: (30%) 
After completing the in_lab section, edit and upgrade cashRegister.c to add the GST to the total entered by the user. 

Display the amount of the GST and then the total due. Then display the number of quarters, dimes, nickels and pennies required to pay the total amount. 

Problem: 8.68 * .13 is equal to 1.1284, which should be rounded up to 1.13, and the format specifier %.2lf will display as 1.13, but the number will be truncated to 1.12 on a C standard compiler, such as matrix, if we multiply by 100 and cast to an int, which we must do at some point in the program. 

To find the correct value for GST do the following: 

GST = amountOwing * .13 + .005; (result is 1.1334 which will resolve to 1.13 when either rounded or truncated)  

After Calculating the number of loonies required, subtract the number of loonies from the amountOwing, then cast the remaining decimal portion to an int. The subsequent operations must be done using integer division and modulus. Although the answer can be derived without using the modulus operator, failure to use modulus will result in a grade of 0 for the At_Home portion of the workshop. 

Hints: 

-          Read about casting, division and modulus in the notes 

-          0.35 * 100 = 35  

-          You can output the value 5, stored in an int variable as $0.05 like this:  printf(“$%1.2f”, (float)intBalance/100); 

Execution and Output Example: 

Please enter the amount to be paid: $8.68 GST: 1.13 Balance owing: $9.81 Loonies required: 9, balance owing $0.81 Quarters required: 3, balance owing $0.06 Dimes required: 0, balance owing $0.06 Nickels required: 1, balance owing $0.01 Pennies required: 1, balance owing $0.00 

AT-HOME REFLECTION (40%)
Please provide answers to the following in a text file named reflect.txt. 

In three or more paragraphs, explain what you learned while doing this workshop. Tell us what was interesting and what you found difficult. Explain why it is often a best practice to convert floating-point values to integers when performing arithmetic operations. Why is it a best practice to use the modulus operator rather than division and subtraction to find a remainder?  

Reflections will be graded on clarity of thought, grammar and spelling.