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CMSC 104
Sections 103/105/401
Programming Project Four
Random Grades
Assigned: Tuesday 5/4/99
Due: Before Midnight Friday 5/14/99
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The Objective
The purpose of this project is to give you practice with arrays and the
'for' loops that are
almost always used with them. You will also be passing an array
to a function and getting practice with formatted output.
The Background
As an experiment, I have decided to determine the grade distribution in
CMSC 104 by
randomly generating exam scores. Final letter grades will be
calculated from 3 exams and assigned the usual letter.
Your job is to randomly generate the exam scores and perform
some analysis of the scores and letter grades.
The Task
Your task is to write a program that randomly generates 3 exam grades for
20 CMSC 104 students. Because CMSC 104 students study hard and
pay close attention in class, no student could possibly receive a
score less than 45 on any exam. Therefore, you should generate
exam scores between 45 and 100, inclusive.
When all exam scores are generated, you must calculate the semester
average for each student. Then,
assign a letter grade to each student according to the usual scale
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A 90 -100
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B 80 - 89
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C 70 - 79
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D 60 - 69
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F less than 60
Your program should then analyze the letter grades and count the number
of A's, B's, etc.
To insure that all projects get the same results, you must observe the
following guidelines:
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Your program must prompt the user for a positive integer that is used to
seed the random number generator. Use the seed in the sample run below
to test your code. You should get exactly the same output.
You may (wisely) choose to use the function GetPostiveInteger() from
project 3
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You must generate all scores for exam1, then all scores for exam2, then
all scores for the final exam
This requirement highly suggests the use of a function to generate
the scores.
Program Requirements
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Your program must use arrays where appropriate. You will need at least
3 arrays (for the exam scores) and may use more
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Your program must have at least one function that
takes an array as a parameter (see guidelines above for a big hint).
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Your program must ask the user for a positive random number generator seed
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Your program's output must contain all information shown below. You
may provide another format
if you wish, but it must be neatly aligned and contain all data.
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Your program must be named proj4.c
Sample Output
<![CDATA[
retriever[102] a.out
Please enter a positive random number seed: 555
Student Exam1 Exam2 Final Average Grade
1 97 87 85 89.67 B
2 45 92 62 66.33 D
3 57 79 59 65.00 D
4 95 48 60 67.67 D
5 79 66 47 64.00 D
6 94 91 92 92.33 A
7 45 90 63 66.00 D
8 61 95 92 82.67 B
9 46 97 58 67.00 D
10 64 89 90 81.00 B
11 54 60 73 62.33 D
12 99 54 60 71.00 C
13 73 66 79 72.67 C
14 76 45 58 59.67 F
15 81 72 65 72.67 C
16 54 88 71 71.00 C
17 51 84 90 75.00 C
18 84 46 54 61.33 D
19 89 60 83 77.33 C
20 68 57 71 65.33 D
Grade Distribution:
A: 1
B: 3
C: 6
D: 9
F: 1
retriever[104]
]]>
10-Point Extra Credit
Before beginning the extra credit portion of this project, it would
be in your own best interest to complete and submit the required
program first.
Many times students ask about "curving" grades.
While I do not "curve" grades, I do sometimes
round grades to the next highest integer score. For a 10-point
bonus, enhance your program to do the following
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Round each semester average to the nearest whole number. A score which
is exactly half-way two integers
(e.g. 88.50) should be rounded up.
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Add two new columns to the output; one for the rounded score and one for
the letter grade that corresponds to the rounded score.
- If the letter grade is different, indicate so by printing two *s
at the end of the line (see sample output below)
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Count the number of A's, B's, etc that result from the rounded scores and
print next to the number
of A's, B's etc from the unrounded scores.
Extra Credit Sample Output
<![CDATA[
retriever[103] a.out
Please enter a positve random number seed: 555
Student Exam1 Exam2 Final Average Grade RoundedAve Grade
1 97 87 85 89.67 B 90.00 A **
2 45 92 62 66.33 D 66.00 D
3 57 79 59 65.00 D 65.00 D
4 95 48 60 67.67 D 68.00 D
5 79 66 47 64.00 D 64.00 D
6 94 91 92 92.33 A 92.00 A
7 45 90 63 66.00 D 66.00 D
8 61 95 92 82.67 B 83.00 B
9 46 97 58 67.00 D 67.00 D
10 64 89 90 81.00 B 81.00 B
11 54 60 73 62.33 D 62.00 D
12 99 54 60 71.00 C 71.00 C
13 73 66 79 72.67 C 73.00 C
14 76 45 58 59.67 F 60.00 D **
15 81 72 65 72.67 C 73.00 C
16 54 88 71 71.00 C 71.00 C
17 51 84 90 75.00 C 75.00 C
18 84 46 54 61.33 D 61.00 D
19 89 60 83 77.33 C 77.00 C
20 68 57 71 65.33 D 65.00 D
Grade Distribution: Rounded Grades
A: 1 2
B: 3 2
C: 6 6
D: 9 10
F: 1 0
]]>
Submitting Your Program
Submit your program in the usual way. At the Unix command, type
submit cs104-103 proj4 proj4.c
To verify that your program was submitted successfully, use the command
submitls cs104-103 proj4