41-45

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_STUDENTS 100

typedef struct
{
    char id[4];
    char name[50];
    int assignment;
    int midExam;
    int finalExam;
} Student;

Student students[MAX_STUDENTS];

int studentCount = 0;

char *getGrade(float score)
{
    if (score >= 85)
    {
        return "A";
    }
    else if (score >= 80)
    {
        return "A-";
    }
    else if (score >= 75)
    {
        return "B+";
    }
    else if (score >= 70)
    {
        return "B";
    }
    else if (score >= 65)
    {
        return "B-";
    }
    else if (score >= 60)
    {
        return "C+";
    }
    else if (score >= 55)
    {
        return "C";
    }
    else if (score >= 45)
    {
        return "D";
    }
    else
    {
        return "E";
    }
}

float getFinalScore(int assignment, int midExam, int finalExam)
{
    return (0.3 * assignment) + (0.3 * midExam) + (0.4 * finalExam);
}

void addStudent()
{
    printf("> Add student\n");

    if (studentCount >= MAX_STUDENTS)
    {
        printf("Maximum students reached\n");
        return;
    }

    printf("ID: ");
    scanf("%s", students[studentCount].id);
    printf("Name: ");
    scanf(" %[^\n]s", students[studentCount].name);
    printf("Assignment: ");
    scanf("%d", &students[studentCount].assignment);
    printf("Mid Exam: ");
    scanf("%d", &students[studentCount].midExam);
    printf("Final Exam: ");
    scanf("%d", &students[studentCount].finalExam);

    studentCount++;
}

void displayStudentDetails()
{
    printf("> Student details\n");

    printf("|%-5s|%-20s|%-10s|%-10s|%-10s|%-15s|%-10s|\n", "ID", "Name", "Assignment", "Mid Exam", "Final Exam", "Final Score", "Final Grade");

    for (int i = 0; i < studentCount; i++)
    {
        float finalScore = getFinalScore(students[i].assignment, students[i].midExam, students[i].finalExam);
        char *finalGrade = getGrade(finalScore);

        printf("|%-5s|%-20s|%-10d|%-10d|%-10d|%-15.2f|%-10s|\n", students[i].id, students[i].name, students[i].assignment, students[i].midExam, students[i].finalExam, finalScore, finalGrade);
    }
}

void displayGradeAverage()
{
    printf("> Grade average \n");

    float assignmentTotal = 0;
    float midExamTotal = 0;
    float finalExamTotal = 0;

    for (int i = 0; i < studentCount; i++)
    {
        assignmentTotal += students[i].assignment;
        midExamTotal += students[i].midExam;
        finalExamTotal += students[i].finalExam;
    }

    float assignmentAverage = assignmentTotal / studentCount;
    float midExamAverage = midExamTotal / studentCount;
    float finalExamAverage = finalExamTotal / studentCount;
    float finalScoreAverage = (0.3 * assignmentAverage) + (0.3 * midExamAverage) + (0.4 * finalExamAverage);

    printf("Assignment : %.2f\n", assignmentAverage);
    printf("Mid Exam : %.2f\n", midExamAverage);
    printf("Final Exam : %.2f\n", finalExamAverage);
    printf("Final Score: %.2f\n", finalScoreAverage);
}

int main()
{
    int choice;

    while (1)
    {
        printf("> Menu\n");
        printf("1. Add student\n");
        printf("2. Display student details\n");
        printf("3. Display grade average\n");
        printf("\n");
        printf("0. Exit\n");
        printf("\n");
        printf("Menu: ");
        scanf("%d", &choice);

        switch (choice)
        {
            case 1:
                addStudent();
                break;
            case 2:
                displayStudentDetails();
                break;
            case 3:
                displayGradeAverage();
                break;
            case 0:
                exit(0);
            default:
                printf("Invalid choice\n");
        }
    }

    return 0;
}