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日期:2020-11-24 08:58

Assignment 9 – Grade Calculator & Review
BIT 1400 Fall 2020
Objective:
Calculating your final grade (you can use this program to check your final grade) ends up
touching on strings, file I/O, structs, static arrays, loops and functions; all the content of exam 2.
Thus, don’t think of the assignment as extra work; you can think of it as preparing for the
exam…this also means you shouldn’t protest having an assignment at the same time as the
exam.
Important Note: we have done much of the work for this assignment already. Grab code from
your A6 and A8 submissions or use the provided solutions. That will not be considered cheating.
Submission:
? You will make a new .cpp file that you will submit (or modify the starter code below)
? If using the starter code, it should run and “work” before you modify it.
? Make sure your final program compiles and works.
? Be sure to include tests and comments in your code. You can make multiple different
.txt files to read in (it will be better for testing your code). In that case submit both your
.cpp and these test files in a .zip file.
? Save the .cpp file as A9_CalcGrades__F20.cpp where name is your first initial
and last name. Eg: A9_CalcGrades_DSprague_F20.cpp
? Submit your .cpp file or your .zip file to cuLearn before the deadline.
? Remember that you can submit your assignment multiple times before the deadline. We
will only grade your last submission. Therefore, you can submit partial work to make
sure you don’t run out of time.
Grading:
Part 1: Code Running (50 pts)
? Code compiling and running correctly including reading in the given .txt file (10 pts)
o The .txt file can be found here: https://drive.google.com/file/d/1lo8P8A5tO6pBZIxaPCwGRSuysokg0_Q/view?usp=sharing
? The file with the grades is successfully read in (10 pts).
? The grades are successfully stored in structs (10 pts).
? The percentage of the final grade calculated for each course deliverable works as
expected (10 pts).
? The final grade is calculated and gives the expected results (10 pts)
Note: the TAs have the right to change the input file to have a different number of assignments
or quizzes. Some course deliverables may also be missing. You can assume this will result in a
mark of 0 for the missing deliverable. You are trying to make your program as generalizable as
possible.
Part 2: Code quality (50 pts)
? Overall code quality (10 pts)
? Code format and readability (10pts for all functions)
o Code formatting and readability includes indentation and code layout.
? Appropriate comments and variable names (approx. 5pts per function, 20 pts total)
o Note this is for appropriate comments. A comment like “Declares a variable X” is
not helpful at all. Will your TA know exactly what the code is doing immediately?
If not, you should put a comment. I saw a number of excessive comments in
prior assignments.
? The code is logically correct without potential bugs (10pts total)
PROVIDED CODE:
Feel free to use the provided code to help simplify the assignment or use it as an example how
to parse strings.
https://drive.google.com/file/d/1wfPOEUpGJJZRdNYPe-FUAIvL9D-mKBtB/view?usp=sharing
Here is a sample text file to read in:
https://drive.google.com/file/d/1lo8P8A5tO6pB-ZIxaPCwGRSuysokg0_Q/view?usp=sharing
Questions:
Start
Remember to make a blank project, add a new .cpp file that contains the main method, and
then iteratively code/compile/test. You can also start with the provided starter code if you
prefer. You are expected to test all functions you write and write comments in your code to help
explain your work.
Copy the text test file Grades.txt to the course code directory (where your .cpp file is located)
and then
1. right-click the resources files folder in your Solution Explorer window,
2. select Add Existing
3. and add the text file to the project.
https://drive.google.com/file/d/1lo8P8A5tO6pB-ZIxaPCwGRSuysokg0_Q/view?usp=sharing
Make sure the file is in the same directory as your .cpp file.
Feel free to use the provided starter code which defines several functions for you. It will also
save you time from having to write many of the function comment blocks. I personally believe
using the starter code will make the task easier.
https://drive.google.com/file/d/1wfPOEUpGJJZRdNYPe-FUAIvL9D-mKBtB/view?usp=sharing
Task 1: Read in the text file.
Make sure you grab your code from A6 and A8. Your job is to write a function that reads in the
contents of a .txt file.
? For each line of the text (use fgets), the format would be: Type>,,,…
? Extract the evaluation type and the grades from the line, then pass this information to
function updateGradeSet (see in task 2).
? Grades should be stored in a DYNAMIC array…..dynamic arrays are not on exam 2 but
are extremely important to learn. They were discussed in last week’s scheduled lectures.
? You should not make any assumptions about white spaces or the number of grades per
line. If the line has 0 grades, then the student gets a 0 for that evaluation type.
Hint:
? You cannot directly use the file reading code from A8 since the fields will be different but
much of that code (getting each field) will be the same.
? You will want to use the function atoi or atof to convert text to a number.
? You don’t really know where the end of the line is and the delimiter is a comma ‘,’ so
fscanf won’t work.
? If you get stuck in this step notice the provided main function has a huge chunk of
commented out code. This is code to make the grade data in code (rather than reading
from a file). Only use this if you can’t get Task 1 off the ground.
Task 2: Define updateGradeSet
If you are using the provided code, then you need to define the following function:
void updateGradeSet(GradeSet1400* p_toMod, char* a_gradeName, int*
a_grades, int numGrades);
(The following corresponds to the PROVIDED CODE. If you write the code yourself you will
probably have to take a similar approach)
? The function updateGradeSet takes a pointer p_toMod to a GradeSet1400 and modifies
one variable in p_toMod.
o For example, if a_gradeName is “QUIZ” then we call createGradeData to create
a DGrades1400 struct (the D stands for dynamic) that stores all information
about quizzes. We then save that struct to p_toMod.
o In the provided code, p_toMod->quizzes means we access the quizzes variable
in the grade set. The “->” works like the ‘.’ when using a struct (eg
“toMod.quizzes”) but for pointers. We cover this in the pointers’ lectures (the
week of the exam). We just need to touch on this a little for this assignment.
Pointers are not on the exam.
? You will have to implement other conditionals for exam1, exam2, assignments, final
exam, and labs.
If you are not using the provided code, then your program should have read in the text file and
put all grades into the GradeSet1400 struct in some way. At the end of this task you should
have all the data necessary to calculate your final grade.
Task 3: Define calcTypeGrade
double calcTypeGrade (DGrades1400 grades);
Define a function calcTypeGrade that takes a DGrades1400 struct, calculates and returns the
final grade for that evaluation type.
Example 1: if the quizzes read in were “QUIZ,100, 100, 100, 100, 100,50, 50, 100, 100, 100,
100, 25, 25, 100, 100”
Grades (dynamic) array: {100, 100, 100, 100, 100, 50, 50, 100, 100, 100, 100, 25, 25,
100, 100}
Number of grades: 15
QUIZ_GRADES_COUNTED: 12
QUIZ_PCT: 0.05
? The top 12 grades would be {100, 100, 100, 100, 100, 50, 100, 100, 100, 100, 100, 100}
? The average of these top 12 grades would be 1150 / 12, which is 95.8…these last two steps
are already done for you if you take the code from A6.
? The student’s final mark (out of 5) on the quiz is 95.8 * QUIZ_PCT (0.05), which is 4.79.
Example 2: if the average assignment grade after dropping the 2 lowest is 80%, then the
assignment mark would be 80 * ASSIGN_PCT (0.3), which is 24.0.
Task 4: Define calculateGrade
int calculateGrade(GradeSet1400 grades);
Now write a function calculateGrade that takes a GradeSet1400 and returns you final grade for
the class (out of 100).
This function should simply need to call calcTypeGrade numerous times and sum the results.
Don’t get cute: Call calcTypeGrade even if there is only 1 grade in the DGrades1400. If all the
evaluation types use the same structure you can keep using the same function.
(simple) Task 5: Miscellaneous
? Make sure you free any dynamic memory you requested. This was done for you but
commented out. Make sure freeGradeData is correct.
? Optional: Notice the function calcLetterGrade has not been defined. You can define it to get
the course letter grade based on the grade percent.
? Extra practice for exam2: not explicitly in this assignment but make sure
a) you can write a ternary expression, switch statement and do-while loop
b) you can debug and reason about code
c) You should continue to know about binary, hex, 2s complement, and pseudocode
d) Make sure you write tests for your code to show you know what kinds of cases you
might encounter.

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