Students_Management_System.c

// C program for the implementation of By: khushhal69
// menu driven program for student
// management system
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
// Variable to keep track of
// number of students
int i = 0;
 
// Structure to store the student
struct sinfo {
    char fname[50];
    char lname[50];
    int roll;
    float cgpa;
    int cid[10];
} st[55];
 
// Function to add the student
void add_student()
{
 
    printf("Add the Students Details\n");
    printf("-------------------------\n");
    printf("Enter the first "
           "name of student\n");
    scanf("%s", st[i].fname);
    printf("Enter the last name"
           " of student\n");
    scanf("%s", st[i].lname);
    printf("Enter the Roll Number\n");
    scanf("%d", &st[i].roll);
    printf("Enter the CGPA "
           "you obtained\n");
    scanf("%f", &st[i].cgpa);
    printf("Enter the course ID"
           " of each course\n");
    for (int j = 0; j < 5; j++) {
        scanf("%d", &st[i].cid[j]);
    }
    i = i + 1;
}
 
// Function to find the student
// by the roll number
void find_rl()
{
    int x;
    printf("Enter the Roll Number"
           " of the student\n");
    scanf("%d", &x);
    for (int j = 1; j <= i; j++) {
        if (x == st[i].roll) {
            printf(
                "The Students Details are\n");
            printf(
                "The First name is %s\n",
                st[i].fname);
            printf(
                "The Last name is %s\n",
                st[i].lname);
            printf(
                "The CGPA is %f\n",
                st[i].cgpa);
            printf(
                "Enter the course ID"
                " of each course\n");
        }
        for (int j = 0; j < 5; j++) {
            printf(
                "The course ID are %d\n",
                st[i].cid[j]);
        }
        break;
    }
}
 
// Function to find the student
// by the first name
void find_fn()
{
    char a[50];
    printf("Enter the First Name"
           " of the student\n");
    scanf("%s", a);
    int c = 0;
 
    for (int j = 1; j <= i; j++) {
        if (!strcmp(st[j].fname, a)) {
 
            printf(
                "The Students Details are\n");
            printf(
                "The First name is %s\n",
                st[i].fname);
            printf(
                "The Last name is %s\n",
                st[i].lname);
            printf(
                "The Roll Number is %d\n ",
                st[i].roll);
            printf(
                "The CGPA is %f\n",
                st[i].cgpa);
            printf(
                "Enter the course ID of each course\n");
 
            for (int j = 0; j < 5; j++) {
                printf(
                    "The course ID are %d\n",
                    st[i].cid[j]);
            }
            c = 1;
        }
        else
            printf(
                "The First Name not Found\n");
    }
}
 
// Function to find
// the students enrolled
// in a particular course
void find_c()
{
    int id;
    printf("Enter the course ID \n");
    scanf("%d", &id);
    int c = 0;
 
    for (int j = 1; j <= i; j++) {
        for (int d = 0; d < 5; d++) {
            if (id == st[j].cid[d]) {
 
                printf(
                    "The Students Details are\n");
                printf(
                    "The First name is %s\n",
                    st[i].fname);
                printf(
                    "The Last name is %s\n",
                    st[i].lname);
                printf(
                    "The Roll Number is %d\n ",
                    st[i].roll);
                printf(
                    "The CGPA is %f\n",
                    st[i].cgpa);
 
                c = 1;
 
                break;
            }
            else
                printf(
                    "The First Name not Found\n");
        }
    }
}
 
// Function to print the total
// number of students
void tot_s()
{
    printf("The total number of"
           " Student is %d\n",
           i);
    printf("\n you can have a "
           "max of 50 students\n");
    printf("you can have %d "
           "more students\n",
           50 - i);
}
 
// Function to delete a student
// by the roll number
void del_s()
{
    int a;
    printf("Enter the Roll Number"
           " which you want "
           "to delete\n");
    scanf("%d", &a);
    for (int j = 1; j <= i; j++) {
        if (a == st[j].roll) {
            for (int k = j; k < 49; k++)
                st[k] = st[k + 1];
            i--;
        }
    }
    printf("The Roll Number"
           " is removed Successfully\n");
}
 
// Function to update a students data
void up_s()
{
 
    printf("Enter the roll number"
           " to update the entry : ");
    long int x;
    scanf("%ld", &x);
    for (int j = 0; j < i; j++) {
        if (st[j].roll == x) {
            printf("1. first name\n"
                   "2. last name\n"
                   "3. roll no.\n"
                   "4. CGPA\n"
                   "5. courses\n");
            int z;
            scanf("%d", &z);
            switch (z) {
            case 1:
                printf("Enter the new "
                       "first name : \n");
                scanf("%s", st[j].fname);
                break;
            case 2:
                printf("Enter the new "
                       "last name : \n");
                scanf("%s", st[j].lname);
                break;
            case 3:
                printf("Enter the new "
                       "roll number : \n");
                scanf("%d", &st[j].roll);
                break;
            case 4:
                printf("Enter the new CGPA : \n");
                scanf("%f", &st[j].cgpa);
                break;
            case 5:
                printf("Enter the new courses \n");
                scanf(
                    "%d%d%d%d%d", &st[j].cid[0],
                    &st[j].cid[1], &st[j].cid[2],
                    &st[j].cid[3], &st[j].cid[4]);
                break;
            }
            printf("UPDATED SUCCESSFULLY.\n");
        }
    }
}
 
// Driver code
void main()
 
{
    int choice, count;
    while (i = 1) {
        printf("The Task that you "
               "want to perform\n");
        printf("1. Add the Student Details\n");
        printf("2. Find the Student "
               "Details by Roll Number\n");
        printf("3. Find the Student "
               "Details by First Name\n");
        printf("4. Find the Student "
               "Details by Course Id\n");
        printf("5. Find the Total number"
               " of Students\n");
        printf("6. Delete the Students Details"
               " by Roll Number\n");
        printf("7. Update the Students Details"
               " by Roll Number\n");
        printf("8. To Exit\n");
        printf("Enter your choice to "
               "find the task\n");
        scanf("%d", &choice);
        switch (choice) {
        case 1:
            add_student();
            break;
        case 2:
            find_rl();
            break;
        case 3:
            find_fn();
            break;
        case 4:
            find_c();
            break;
        case 5:
            tot_s();
            break;
        case 6:
            del_s();
            break;
        case 7:
            up_s();
            break;
        case 8:
            exit(0);
            break;
        }
    }
}