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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include "MYTOOLS.h"

#define MAX_SUBJECTS 10
#define MAX_NAME_LENGTH 50
#define MAX_COURSE_LENGTH 10

struct name {
    char firstName[MAX_NAME_LENGTH];
    char middleName[MAX_NAME_LENGTH];
    char lastName[MAX_NAME_LENGTH];
};

struct birth {
    char month[MAX_NAME_LENGTH];
    int day;
    long year;
};

struct mysubject {
    char subject[MAX_NAME_LENGTH];
    float unit_per_subject;
    float finalGrade_per_subject;
};

struct studentRec {
    long idnumber;
    struct name students_name;
    char gender;
    struct birth birthdate;
    char courseYear[MAX_COURSE_LENGTH];
    int numberOfSubjectsEnrolled;
    struct mysubject subjects[MAX_SUBJECTS];
};

void clearInputBuffer() {
    int c;
    while ((c = getchar()) != '\n' && c != EOF);
}

int main() {
    int choice;
    int i;
    struct studentRec student;
    gotoxy(34,34);
    do {
        clrscr();
        drawDBox(3,3,65,26);

        gotoxy(10, 5); printf("I.D. number : ");
        scanf("%ld", &student.idnumber);
        clearInputBuffer();

        gotoxy(10, 6); printf("N A M E : ");
        scanf("%s %s %s", student.students_name.firstName, student.students_name.middleName, student.students_name.lastName);
        clearInputBuffer();


        gotoxy(10, 7); printf("GENDER[M/F] : ");
        scanf(" %c", &student.gender);
        clearInputBuffer();


        gotoxy(10, 8); printf("BIRTHDATE : ");
        scanf("%s %d %ld", student.birthdate.month, &student.birthdate.day, &student.birthdate.year);
        clearInputBuffer();


        gotoxy(10, 9); printf("COURSE & YR : ");
        fgets(student.courseYear, MAX_COURSE_LENGTH, stdin);
        student.courseYear[strcspn(student.courseYear, "\n")] = 0;

        gotoxy(20, 11); printf("Total no. of subjects: ");
        scanf("%d", &student.numberOfSubjectsEnrolled);
        clearInputBuffer();

        gotoxy(10, 13); printf("SUBJECT");
        gotoxy(30, 13); printf("UNIT");
        gotoxy(50, 13); printf("GRADE");


        for (i = 0; i < student.numberOfSubjectsEnrolled; i++) {
            gotoxy(10, 14 + i); fgets(student.subjects[i].subject, MAX_NAME_LENGTH, stdin);
            student.subjects[i].subject[strcspn(student.subjects[i].subject, "\n")] = 0;

            gotoxy(30, 14 + i); scanf("%f", &student.subjects[i].unit_per_subject);
            clearInputBuffer();

            gotoxy(50, 14 + i); scanf("%f", &student.subjects[i].finalGrade_per_subject);
            clearInputBuffer();
        }


        float sumProduct = 0;
        float total_units = 0;
        for (i = 0; i < student.numberOfSubjectsEnrolled; i++) {
            sumProduct += (student.subjects[i].unit_per_subject * student.subjects[i].finalGrade_per_subject);
            total_units += student.subjects[i].unit_per_subject;
        }
        float gpa = sumProduct / total_units;

        gotoxy(10, 15 + student.numberOfSubjectsEnrolled); printf("GPA : %.2f\n", gpa);
        gotoxy(10, 17 + student.numberOfSubjectsEnrolled); printf("Press 1 to continue or 0 to exit... ");
        scanf("%d", &choice);

    } while (choice == 1);

    return 0;
}