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# CptS 121 Programming Assignment 3: Statistical Analysis of Student Records solved

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## Description

I. Learner Objectives:
At the conclusion of this programming assignment, participants should be able to:
Open and close files
Read, write to, and update files
Manipulate file handles
Apply standard library functions: fopen (), fclose (), fscanf (), and fprintf ()
Compose decision statements (“if” conditional statements)
Create and utilize compound conditions
II. Prerequisites:
Before starting this programming assignment, participants should be able to:
Analyze a basic set of requirements and apply top-down design principles for a problem
Customize and define C functions
Apply the 3 file format: 1 header file and 2 source files
Document and comment a modular C program according to class standards
Implement guard code in a header file
Summarize topics from Hanly & Koffman Chapter 4 including:
What is a selection or conditional statement?
What is a compound condition?
What is a Boolean expression?
What is a flowchart?
III. Overview & Requirements:
Write a program that processes numbers, corresponding to student records read in from a file,
and writes the required results to an output file (see main ( )). Your program should define the
following functions:
(5 pts) double read_double (FILE *infile) — Reads one double precision number from the
input file. Note: You may assume that the file only contains real numbers.
(5 pts) int read_integer (FILE *infile) – Reads one integer number from the input file.
(5 pts) double calculate_sum (double number1, double number2, double number3, double
number4, double number5) – Finds the sum of number1, number2, number3, number4, and
number5 and returns the result.
(5 pts) double calculate_mean (double sum, int number) – Determines the mean through
the calculation sum / number and returns the result. You need to check to make sure that
number is not 0. If it is 0 the function returns -1.0 (we will assume that we are calculating
the mean of positive numbers), otherwise it returns the mean.
(5 pts) double calculate_deviation (double number, double mean) – Determines the
deviation of number from the mean and returns the result. The deviation may be calculated
as number – mean.
(10 pts) double calculate_variance (double deviation1, double deviation2, double
deviation3, double deviation4, double deviation5, int number) – Determines the variance
through the calculation: ((deviation1)^2 + (deviation2)^2 + (deviation3)^2 + (deviation4)^2
+ (deviation5)^2) / number and returns the result. Hint: you may call your calculate_mean (
) function to determine the result.
(5 pts) double calculate_standard_deviation (double variance) – Calculates the standard
deviation as sqrt (variance) and returns the result. Recall that you may use the sqrt ( )
function that is found in math.h.
(10 pts) double find_max (double number1, double number2, double number3, double
number4, double number5) — Determines the maximum number out of the five input
parameters passed into the function, returning the max.
(10 pts) double find_min (double number1, double number2, double number3, double
number4, double number5) — Determines the minimum number out of the five input
parameters passed into the function, returning the min.
(5 pts) void print_double (FILE *outfile, double number) — Prints a double precision
number (to the hundredths place) to an output file.
(20 pts) A main ( ) function that does the following (this is what the program does!!!):
Opens an input file “input.dat” for reading;
Opens an output file “output.dat” for writing;
Reads five records from the input file (input.dat); You will need to use a combination of
Calculates the sum of the GPAs;
Calculates the sum of the class standings;
Calculates the sum of the ages;
Calculates the mean of the GPAs, writing the result to the output file (output.dat);
Calculates the mean of the class standings, writing the result to the output file (output.dat);
Calculates the mean of the ages, writing the result to the output file (output.dat);
Calculates the deviation of each GPA from the mean (Hint: need to call calculate_deviation ( ) 5
times)
Calculates the variance of the GPAs
Calculates the standard deviation of the GPAs, writing the result to the output file (output.dat);
Determines the min of the GPAs, writing the result to the output file (output.dat);
Determines the max of the GPAs, writing the result to the output file (output.dat);
Closes the input and output files (i.e. input.dat and output.dat)
Expected Input File Format (real numbers only):
For this assignment you will be required to read five records from the “input.dat” file. Each
record will have the following form:
Student ID# (an 8 digit integer number)
GPA (a floating-point value to the hundredths place)
Class Standing (1 – 4, where 1 is a freshmen, 2 is a sophomore, 3 is a junior, and 4 is a senior
–> all integers)
Age (a floating-point value)
Example data for 1 student record in the file could be as follows:
12345678
3.78
3
20.5
IV. Expected Results:
The following sample session demonstrates how your program should work.
Assuming input.dat stores the following records:
12345678
3.78
3
20.5
87654321
2.65
2
19.25
08651234
3.10
1
18.0

11112222
3.95
4
22.5
22223234
2.45
3
19.3333
Your program should write the following to output.dat: NOTE: you only need to output the
numbers, the text is for demonstration purposes only.
3.19 — GPA Mean
2.60 — Class Standing Mean
19.92 — Age Mean
0.60 — GPA Standard Deviation
2.45 — GPA Min
3.95 — GPA Max
V. Submitting Assignments:
“Programming Assignments” (PA) folder. Your solution should be zipped into a .zip file with
navigate to your correct Canvas lab course space. Select the “Assignments” link in the main
left menu bar. Navigate to the correct PA submission folder. Click the “Start Assignment”
button. Click the “Upload File” button. Choose the appropriate .zip file with your solution.
Finally, click the “Submit Assignment” button.
2. Your .zip file should contain your one header file (a .h file), two C source files (which must
be .c files), and project workspace. Delete the debug folders and/or x64 folders before you
zip the project folder.
3. Your project must build properly. The most points an assignment can receive if it does not
build properly is 65 out of 100.