Sample Project

#include <stdio.h>

struct school {
    char name[100];
    int roll;
    double marks;
};

struct school student[100];
int size = 0;

void menu() {
    printf("Main Menu\n");
    printf("1. Insert\n");
    printf("2. Display\n");
    printf("3. Search\n");
    printf("4. Update\n");
    printf("5. Exit\n");
}


void insert() {
    printf("How many students do you have?\n");
    scanf("%d", &size);
    for (int i = 0; i < size; i++) {
        printf("Enter student's name:\n");
        fflush(stdin);
        gets(student[i].name);
        fflush(stdout);
        printf("Enter student's roll no:\n");
        scanf("%d", &student[i].roll);
        printf("Enter student's total marks:\n");
        scanf("%lf", &student[i].marks);
    }
}

void display() {
    if (size == 0) {
        printf("Array is empty\n\n");
    } else {
        printf("Student's Information\n");
        for (int i = 0; i < size; i++) {
            printf("Name: %s\t", student[i].name);
            printf("Roll: %d\t", student[i].roll);
            printf("Marks: %.2lf\n", student[i].marks);
        }
        printf("\n");
    }
}


void search() {
    if (size == 0) {
        printf("Array is empty\n\n");
    } else {
        int temp;
        printf("Enter studen't roll no:\n");
        scanf("%d", &temp);
        int flag = 1;

        for (int i = 0; i < size; i++) {
            if (student[i].roll == temp) {
                printf("Name: %s\t", student[i].name);
                printf("Roll: %d\t", student[i].roll);
                printf("Marks: %.2lf\n", student[i].marks);
                flag = 0;
            }
        }
        if (flag == 1) {
            printf("Invalid Information\n\n");
        }
    }
}

void update() {
    if (size == 0) {
        printf("Array is empty\n\n");
    } else {
        int temp;
        printf("Enter studen't roll no:\n");
        scanf("%d", &temp);
        int flag = 1;

        for (int i = 0; i < size; i++) {
            if (student[i].roll == temp) {
                double value;
                printf("Enter the updated marks:\n");
                scanf("%lf", &value);
                student[i].marks = value;

                flag = 0;
            }
        }
        if (flag == 1) {
            printf("Invalid Information\n\n");
        }
    }
}

int main() {
    printf("Student Mangement System\n");
    while (1) {
        int choice;
        menu();
        printf("Enter your choice\n");
        scanf("%d", &choice);
        if (choice == 1) {
            insert();
        } else if (choice == 2) {
            display();
        } else if (choice == 3) {
            search();
        } else if (choice == 4) {
            update();
        } else if (choice == 5) {
            break;
        } else {
            printf("Invalid Information\n\n");
        }
    }
}

/*
    Project Submission Date: April -> 24

    Structure
        -> insert
        -> Search
        -> update
        -> delete (optional)
    File -> (optional) // (Bonus!)
*/