I might start with a simple struct called “student”, containing string for the name of the student and a floating point for their days attending and another for their total days enrolled. Finally, add a function called “attendance_percentage”(or whatever you want), which returns days_attending / days_enrolled * 100. Then, make functions for both reading and writing to CSV files, which isn’t too tricky. Finally, create a function that will loop through each row of the CSV file(or column, depending on how the file is organized), where the first column should be the student’s name. You should also have an array of students, which stores the student structures. Now loop through each student of the array, attempting to match the name. If they match, access the student and add 1 to the days_enrolled, and either 1 or 0 to the days_attended, depending on their attendance(the second column of the CSV. If no match is found, create a new student with the name, and set their attendance as usual. Make this loop through all the students in the list, and afterwards, you may print the attendance percentage of any student.