Code

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <time.h>

#define RETURNTIME 15

char categories[][15] = {"Student", "Teacher", "Staffs"};
void returnfunc(void);
void mainmenu(void);
void addstaff(void);
void deletestaff(void);
void editstaff(void);
void searchstaff(void);
void viewstaff(void);
void closeapplication(void);
int getdata();
int checkid(int);
int t(void);
void Password();

FILE *fp, *ft;
COORD coord = {0, 0};
int s;
char findstaff;
char password[10] = {"admin"};

struct meroDate {
    int mm, dd, yy;
};

struct staff {
    int id;
    char stname[20];
    char name[20];
    char Address[20];
    char course[10];
    int contact;
    char *cat;
};

struct staff a;

void gotoxy(int x, int y) {
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}

int main() {
    Password();
    return 0;
}

void mainmenu(void) {
    system("cls");
    gotoxy(20, 3);
    printf("College Management System\n");
    printf("\t\t\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\xdb\n");

    gotoxy(20, 5);
    printf("<1> Add new Records");
    gotoxy(20, 7);
    printf("<2> Remove Records");
    gotoxy(20, 9);
    printf("<3> Search Records");
    gotoxy(20, 11);
    printf("<4> View Record's list");
    gotoxy(20, 13);
    printf("<5> Modify Record");
    gotoxy(20, 15);
    printf("<6> Close Application");
    gotoxy(20, 18);
    printf("Enter your choice: ");

    switch (getch()) {
        case '1':
            addstaff();
            break;
        case '2':
            deletestaff();
            break;
        case '3':
            searchstaff();
            break;
        case '4':
            viewstaff();
            break;
        case '5':
            editstaff();
            break;
        case '6':
            exit(0);
        default:
            printf("\n\aWrong Entry!! Please re-enter the correct option\n");
            getch();
            mainmenu();
    }
}

void addstaff(void) {
    system("cls");
    printf("SELECT CATEGORIES\n");
    printf("<1> Student\n");
    printf("<2> Teacher\n");
    printf("<3> Staff\n");
    printf("<4> Back to main menu\n");

    printf("Enter your choice: ");
    scanf("%d", &s);

    if (s == 4)
        mainmenu();

    if (s < 1 || s > 4) {
        printf("Invalid choice!\n");
        getch();
        addstaff();
        return;
    }

    fp = fopen("stf.dat", "ab+");
    if (fp == NULL) {
        printf("Error opening file!\n");
        getch();
        return;
    }

    if (getdata() == 1) {
        a.cat = categories[s - 1];
        fwrite(&a, sizeof(a), 1, fp);
        fclose(fp);

        printf("\nThe record is successfully saved\n");
        printf("Save any more? (Y/N): ");
        if (tolower(getch()) == 'n')
            mainmenu();
        else
            addstaff();
    } else {
        fclose(fp);
    }
}

void deletestaff(void) {
    system("cls");
    int id;
    char another = 'y';

    while (another == 'y') {
        printf("Enter the ID to remove: ");
        scanf("%d", &id);

        fp = fopen("stf.dat", "rb");
        ft = fopen("temp.dat", "wb");

        if (fp == NULL || ft == NULL) {
            printf("Error opening file!\n");
            getch();
            return;
        }

        int found = 0;

        while (fread(&a, sizeof(a), 1, fp) == 1) {
            if (a.id == id) {
                found = 1;
                printf("The record is successfully deleted\n");
            } else {
                fwrite(&a, sizeof(a), 1, ft);
            }
        }

        fclose(fp);
        fclose(ft);

        remove("stf.dat");
        rename("temp.dat", "stf.dat");

        if (!found)
            printf("No record found with the given ID!\n");

        printf("Delete another record? (Y/N): ");
        another = tolower(getch());
    }
    mainmenu();
}

void returnfunc(void) {
    printf("\nPress ENTER to return to main menu");
    while (getch() != 13)
        ;
    mainmenu();
}

int getdata() {
    int id;
    printf("Enter the Information Below\n");
    printf("ID: ");
    scanf("%d", &id);

    if (checkid(id) == 0) {
        printf("\n\aThe ID already exists!\n");
        return 0;
    }

    a.id = id;
    printf("Name: ");
    scanf("%s", a.name);
    printf("Address: ");
    scanf("%s", a.Address);
    printf("Contact: ");
    scanf("%d", &a.contact);
    printf("Course: ");
    scanf("%s", a.course);

    return 1;
}

int checkid(int id) {
    rewind(fp);
    while (fread(&a, sizeof(a), 1, fp) == 1) {
        if (a.id == id)
            return 0;
    }
    return 1;
}

void Password(void) {
    char pass[10];
    char ch;
    int i = 0;

    system("cls");
    printf("\t\tCollege Management System\n");
    printf("\n\nEnter Password: ");

    while ((ch = getch()) != 13) {
        if (ch != 8) {
            pass[i++] = ch;
            printf("*");
        }
    }
    pass[i] = '\0';

    if (strcmp(pass, password) == 0) {
        printf("\n\nPassword matched!\n");
        printf("Press any key to continue...");
        getch();
        mainmenu();
    } else {
        printf("\n\n\aIncorrect Password!\n");
        getch();
        Password();
    }
}