Write a C program to create a structure Student containing fields for Roll No., Name, Class, Year and Total Marks. Create 10 students and store them in a file.

 #include <stdio.h>

#include <string.h>

// Structure definition

struct Student {

    int rollNo;

    char name[50];

    char class[20];

    int year;

    float totalMarks;

};

// Function to input student data

void inputStudent(struct Student *s) {

    printf("\nEnter Roll No: ");

    scanf("%d", &s->rollNo);

    getchar(); // Clear newline from buffer

    

    printf("Enter Name: ");

    fgets(s->name, sizeof(s->name), stdin);

    s->name[strcspn(s->name, "\n")] = 0; // Remove trailing newline

    

    printf("Enter Class: ");

    fgets(s->class, sizeof(s->class), stdin);

    s->class[strcspn(s->class, "\n")] = 0;

    

    printf("Enter Year: ");

    scanf("%d", &s->year);

    

    printf("Enter Total Marks: ");

    scanf("%f", &s->totalMarks);

}

// Function to display student data

void displayStudent(struct Student s) {

    printf("\n----------------------------------------");

    printf("\nRoll No: %d", s.rollNo);

    printf("\nName: %s", s.name);

    printf("\nClass: %s", s.class);

    printf("\nYear: %d", s.year);

    printf("\nTotal Marks: %.2f", s.totalMarks);

    printf("\n----------------------------------------\n");

}

// Function to write students to file

void writeToFile(struct Student students[], int n, char *filename) {

    FILE *fp = fopen(filename, "wb");

    

    if (fp == NULL) {

        printf("Error opening file for writing!\n");

        return;

    }

    

    fwrite(students, sizeof(struct Student), n, fp);

    fclose(fp);

    printf("\n%d students successfully written to file '%s'\n", n, filename);

}

// Function to read students from file

int readFromFile(struct Student students[], char *filename) {

    FILE *fp = fopen(filename, "rb");

    

    if (fp == NULL) {

        printf("Error opening file for reading!\n");

        return 0;

    }

    

    int count = fread(students, sizeof(struct Student), 10, fp);

    fclose(fp);

    return count;

}

int main() {

    struct Student students[10];

    char filename[] = "students.dat";

    int choice, count;

    

    printf("========== STUDENT RECORD MANAGEMENT ==========\n");

    printf("\n1. Enter 10 students and save to file");

    printf("\n2. Read and display students from file");

    printf("\nEnter your choice: ");

    scanf("%d", &choice);

    

    switch(choice) {

        case 1:

            printf("\n***** ENTERING STUDENT DATA *****\n");

            for (int i = 0; i < 10; i++) {

                printf("\n--- Student %d ---", i + 1);

                inputStudent(&students[i]);

            }

            

            writeToFile(students, 10, filename);

            

            printf("\n***** DATA SAVED SUCCESSFULLY *****\n");

            printf("\nDo you want to display the entered data? (1=Yes, 0=No): ");

            int display;

            scanf("%d", &display);

            

            if (display) {

                printf("\n***** DISPLAYING STUDENT DATA *****\n");

                for (int i = 0; i < 10; i++) {

                    printf("\nStudent %d:", i + 1);

                    displayStudent(students[i]);

                }

            }

            break;

            

        case 2:

            printf("\n***** READING FROM FILE *****\n");

            count = readFromFile(students, filename);

            

            if (count > 0) {

                printf("\nSuccessfully read %d students from file '%s'\n", count, filename);

                printf("\n***** DISPLAYING STUDENT DATA *****\n");

                for (int i = 0; i < count; i++) {

                    printf("\nStudent %d:", i + 1);

                    displayStudent(students[i]);

                }

            }

            break;

            

        default:

            printf("\nInvalid choice!\n");

    }

    

    return 0;

}