#include <stdio.h>
 
// Define structure for student
struct Student {
    int rollNo;
    char name[100];
    float marks;
};
 
int main() {
    struct Student s[100], temp;
    int n, i, j;
 
    printf("Enter number of students: ");
    scanf("%d", &n);
    getchar(); // clear input buffer
 
    // Input student details
    for (i = 0; i < n; i++) {
        printf("\nEnter details for Student %d:\n", i + 1);
        printf("Roll No: ");
        scanf("%d", &s[i].rollNo);
        getchar();
 
        printf("Name: ");
        gets(s[i].name);
 
        printf("Marks: ");
        scanf("%f", &s[i].marks);
    }
 
    // Sort students by marks in descending order (highest first)
    for (i = 0; i < n - 1; i++) {
        for (j = i + 1; j < n; j++) {
            if (s[i].marks < s[j].marks) {
                temp = s[i];
                s[i] = s[j];
                s[j] = temp;
            }
        }
    }
 
    // Display sorted list
    printf("\n===== Students Sorted by Marks (Descending) =====\n");
    for (i = 0; i < n; i++) {
        printf("\nRoll No: %d", s[i].rollNo);
        printf("\nName   : %s", s[i].name);
        printf("\nMarks  : %.2f\n", s[i].marks);
    }
 
    return 0;
}