Write a C Program (The question is about Data Structures)

I will appreciate it if you use comments when explaining how to solve it, thanks.

Write a program to input number of students in a class (maximum 100) and their name, last name and grade information. Afterwards you should list all the students according ascending and descending orders by name, last name and grade. Sample Run: Please enter the number of students (Max 100): 3 Enter First name, Last name and grade of the 1. student: Ayse Yildiz 90 Enter First name, Last name and grade of the 2. student: Mustafa Kemal 100 Enter First name, Last name and grade of the 3. student: Atila Durmus 92 List of students by Grade in Ascending Order is: 90 Ayse Yildiz 92 Atila Durmus 100 Mustafa Kemal List of students by Grade in Descending Order is: 100 Mustafa Kemal 92 Atila Durmus 90 Ayse Yildiz List of students by Name in Ascending Order is: Mustafa Kemal 100 Ayse Yildiz 90 Atila Durmus 92 List of students by Name in Descending Order is: Atila Durmus 92 Ayse Yildiz 90 Mustafa Kemal 100 Ordered List by Last Name in Ascending order is Yildiz Ayse 90 Kemal Mustafa 100 Durmus Atila 92 Ordered List by Last Name in Descending order is Durmus Atila 92 Kemal Mustafa 100 Yildiz Ayse 90