#include <stdio.h>

typedef struct {
    char name[50];
    int roll_no;
    char grade;
} student;

void read_students(student students[], int n) {
    for (int i = 0; i < n; i++) {
        printf("Enter details for student %d:\n", i + 1);
        printf("Name: ");
        scanf("%s", students[i].name);
        printf("Roll No: ");
        scanf("%d", &students[i].roll_no);
        printf("Grade: ");
        scanf(" %c", &students[i].grade);
    }
}

void display_students(student students[], int n) {
    printf("\nStudent Information:\n");
    for (int i = 0; i < n; i++) {
        printf("Name: %s, Roll No: %d, Grade: %c\n", students[i].name, students[i].roll_no, students[i].grade);
    }
}

void sort_students_by_roll(student students[], int n) {
    student temp;
    for (int i = 0; i < n - 1; i++) {
        for (int j = i + 1; j < n; j++) {
            if (students[i].roll_no > students[j].roll_no) {
                temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

int main() {
    int n;

    printf("Enter the number of students: ");
    scanf("%d", &n);

    student students[n];

    read_students(students, n);

    printf("\nBefore sorting:\n");
    display_students(students, n);

    sort_students_by_roll(students, n);

    printf("\nAfter sorting by roll number:\n");
    display_students(students, n);

    return 0;
}