Write a C program that saves the name,surname,midterm grade,final grade information of 10 students entered on the keyboard into a file named "notes.txt"

main.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define BUFFER_SIZE 500
int main()
{
    // buffer to store data in buffer between writing to file
    char buffer[BUFFER_SIZE];
    char ch; // To store single character
    int numStudents;
    // Student details
    char name[50];
    char surname[50];
    int midGrades;
    int finalGrades;
    // File Pointer
    FILE *file;
    // Open notes.txt in write mode
    file = fopen("notes.txt", "w");
    // If error in opening file
    if (file == NULL)
    {
        printf("Error in opening file.");
        // Exit from code
        return -1;
    }
    // Ask how many students details user want to enter
    printf("Enter the no. of students: ");
    scanf("%d", &numStudents);
    printf("Enter student details: \n");
    for (int i = 0; i < numStudents; i++)
    {
        printf("\nStudent: %d\n", (i + 1));
        printf("Enter name: ");
        scanf("%s", &name);
        printf("Enter surname: ");
        scanf("%s", &surname);
        printf("Enter midGrades: ");
        scanf("%d", &midGrades);
        printf("Enter finalGrades: ");
        scanf("%d", &finalGrades);
        // Write to file delimeted by "," (comma)
        fprintf(file, "%s,%s,%d,%d\n", name, surname, midGrades, finalGrades);
    }
    // Close the file
    fclose(file);
    // Open file again in read mode
    file = fopen("notes.txt", "r");
    // Get data from file to buffer
    printf("\n---- Results ----\n\n");
    while (fgets(buffer, BUFFER_SIZE, file))
    {
        char *token;
        if (buffer != NULL)
        {
            int i = 1;
            char *str = buffer;
            // Split the string by " "
            while (token = strtok_r(str, ",", &str))
            {
                if (i == 1)
                {
                    // Get name
                    strcpy(name, token);
                }
                else if (i == 2)
                {
                    // Get surname
                    strcpy(surname, token);
                }
                else if (i == 3)
                {
                    // Get midGrades marks
                    midGrades = atoi(token);
                }
                else if (i == 4)
                {
                    // Get finalGrades marks
                    finalGrades = atoi(token);
                }
                i++;
            }
            // Check if student is passed
            // Takeout 40% of midGrades and 60% of finalGrades
            midGrades -= (midGrades * 40) / 100;
            finalGrades -= (finalGrades * 60) / 100;
            // Get sum of midGrades and finalGrades
            int sum = midGrades + finalGrades;
            // Print output
            printf("Name = %s %s New Final Marks = %d", name, surname, sum);
            if (sum >= 50)
            {
                printf(" Result: Passed\n");
            }
            else
            {
                printf(" Result: Failed\n");
            }
        }
    }
    // Close the file
    fclose(file);
    return 0;
}