#include <stdio.h>
#include <stdlib.h>
 
struct Student {
    int roll;
    char name[50];
    float marks;
};
 
int main() {
    FILE *file, *temp;
    struct Student s;
    int roll, found = 0;
 
    file = fopen("students.txt", "r");
    temp = fopen("temp.txt", "w");
 
    if (file == NULL) {
        printf("No student records found!\n");
        return 0;
    }
 
    printf("Enter Roll Number of the Student to Delete: ");
    scanf("%d", &roll);
 
    while (fscanf(file, "%d %s %f", &s.roll, s.name, &s.marks) != EOF) {
        if (s.roll == roll) {
            found = 1;
            printf("Record deleted: Roll=%d, Name=%s, Marks=%.2f\n", s.roll, s.name, s.marks);
            continue; // skip writing this record to temp file
        } else {
            fprintf(temp, "%d %s %.2f\n", s.roll, s.name, s.marks);
        }
    }
 
    fclose(file);
    fclose(temp);
 
    remove("students.txt");
    rename("temp.txt", "students.txt");
 
    if (!found)
        printf("No record found with Roll Number %d\n", roll);
    else
        printf("Record deleted successfully!\n");
 
    return 0;
}