#include <stdio.h>
#include <stdlib.h>
 
// Define structure
struct Student {
    int roll;
    char name[50];
    float marks;
};
 
int main() {
    int n, i;
    struct Student *ptr;
 
    printf("Enter number of students: ");
    scanf("%d", &n);
 
    // Dynamically allocate memory for n students
    ptr = (struct Student *)malloc(n * sizeof(struct Student));
 
    if (ptr == NULL) {
        printf("Memory allocation failed!\n");
        return 1;
    }
 
    // Input student details
    for (i = 0; i < n; i++) {
        printf("\nEnter details for student %d:\n", i + 1);
        printf("Roll Number: ");
        scanf("%d", &ptr[i].roll);
        printf("Name: ");
        scanf("%s", ptr[i].name);
        printf("Marks: ");
        scanf("%f", &ptr[i].marks);
    }
 
    // Display student details
    printf("\n--- Student Details ---\n");
    for (i = 0; i < n; i++) {
        printf("\nStudent %d\n", i + 1);
        printf("Roll Number: %d\n", ptr[i].roll);
        printf("Name: %s\n", ptr[i].name);
        printf("Marks: %.2f\n", ptr[i].marks);
    }
 
    // Free allocated memory
    free(ptr);
 
    return 0;
}