#include <stdio.h>
 
// Define structure
struct Student {
    int roll;
    char name[50];
    float marks;
};
 
int main() {
    struct Student s[100];      // Array of structures
    struct Student *ptr;        // Pointer to structure
    int n, i;
 
    printf("Enter number of students: ");
    scanf("%d", &n);
 
    ptr = s; // Point to the first element of the array
 
    // Input details using pointer
    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 details using pointer
    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);
    }
 
    return 0;
}