Q2: Text File Operations
disp(' ');
disp('Q2 Operations:');
% Part 1: Writing to the file
filename = 'studentGrades.txt';
fileID = fopen(filename, 'w');
fprintf(fileID, '%-12s%12s%12s\n', 'ID', 'Number', 'Grade'); % header
data = [1, 301011234, 100;
2, 301022468, 85;
3, 201037890, 93;
4, 123456789, 67;
5, 987654321, 34];
for i = 1:size(data, 1) % Writing data rows
fprintf(fileID, '%-12d%12d%12d\n', data(i, :));
end
fclose(fileID); % Closing the file after writing
% Part 2: Reading from the file
fileID = fopen(filename, 'r');
disp(fgetl(fileID)); % Display the first line (header)
dataRead = fscanf(fileID, '%d %d %d', [3 inf]); % Read and store the data
dataRead = dataRead'; % Transpose to correct shape
fclose(fileID); % Closing the file after reading
disp(dataRead); % Displaying the read data
% Part 3: Calculating and displaying the average grade
averageGrade = mean(dataRead(:, 3));
disp(['Average Grade: ', num2str(round(averageGrade, 2))]);
Output:
ID
Number
Grade
1
301011234
100
2
301022468
85
3
201037890
93
4
123456789
67
5
987654321
34
Average Grade: 75.8
Note (the output isn’t actually a table but it is the only nice way of putting it in this software)
Explanation:
(Creating our file)**:
Name our list ‘studentGrades.txt’ and add to it.
Open the list to start writing, planning to fill it with student data.
At the top, write our categories: ‘ID’, ‘Number’, and ‘Grade’
List down specific details for each student:
ID.
number
grade.
Once done listing all students, close the list
(Reading from our file)**:
Open our list again because we need to check the content.
Close the list after reviewing to ensure no accidental changes are made.
( Analyzing the data)**:
Calculate the average grade by adding all grades together and then dividing by the number of grades
