Description
Part 1. Count the number of lines in a file.
Write a function
int CountLines(string filename)
that takes in the filename as a parameter and returns the number of lines in the file. Lines
are separated the newline character ‘\n’.
Part 2. Parse a file and store the values in a variable.
For this task you’ll be given a file, containing a list of students and their scores in K subjects,
where K is an arbitrary number. All of these values will be separated by commas. There will
be one student record (Name + K scores) per line. The entire file will therefore be of this
format
Name1, Score1, Score2, Score3 … ScoreK
Name2, Score1, Score2, Score3 … ScoreK
.
.
.
NameN, Score1, Score2, Score3 … ScoreK
Your task will be to read the file, parse it into its individual components and populate two
arrays with the names of each student and their average score respectively.
You will need to write the functionint ReadScores(string filename, string names[], float avg_scores[],
int array_size)
Where
● filename is the name of the input file as specified above
● names[] is an initially empty array of student names
● avg_scores[] is an initially empty array of student’s average scores.
● array_size is the size of the arrays avg_score and names
Your function will return the number of lines read.
Task Details
You’ll first need to initialize every element in the name array with the empty string “”.
Similarly every element in the avg_score array will be initialized with -1.
You will need to read each line in the file and parse the line of data to obtain all the values.
Place the name into the names array and process all the scores to calculate an average to be
placed into the corresponding position of the avg_scores array.
Part 3. Writing back to a file.
Given an array of names and associated averages in the avg_score array (as read from file
in part 2), sort the data into ascending order by name and write the sorted data to the given
filename.
You will need to the write the function
void WriteGrades( string filename, string names[], float avg_scores[],
int n_students)
Where
● filename is the name of the file that you shall be writing to
● names[] is the array containing student names.
● avg_scores[] is the array containing the average scores for each student.
● n_students is the number of students.
Task Details
For every name in the names array, compute the grade from the corresponding average
score. Remember the average score for the student in names[i] is stored in
avg_scores[i].
For each student write a single line into the file with format given below. The format
describes a three fields separated by commas. The nomenclature “” means to place
the name of the student in that location. Similarly, write the other two fields in place of the
“<..>” in the format. (The < and > are not included in the output)
Format: , ,
Compute the grade using the following rubric:
For scores greater than and equal to 90
Grade is A
For scores greater than and equal to 80 and less than 90
Grades is B
For scores greater than and equal to 70 and less than 80
Grades is C
For scores greater than and equal to 60 and less than 70
Grades is D
For scores less than 60
Grades is F
