Admin Without File

#include <iostream>
#include <cstdio>
#include <stdlib.h>
#include <conio.h>
#include <string>
using namespace std;

int cnt, choice;

struct item
{
    char name[100];
    int price;
    int quantity;
    struct item *nextsnacks;
    struct item *nextmeals;
    struct item *nextdrinks;
}*snacksvariable, *mealsvariable, *drinksvariable, *snackstemp, *mealstemp, *drinkstemp;

struct head
{
    int counter;
    struct item *pointer;
}*sheadvariable, *mheadvariable, *dheadvariable;

void creat()
{
    int take;
    printf("\nCategories:\n");
    printf("\t1 = Snacks\n");
    printf("\t2 = Meal\n");
    printf("\t3 = Drinks\n");
    printf("\n\tSelect a Category: ");
    scanf("%d",&take);

    if (take == 1)
    {
        snacksvariable = (struct item*) malloc(sizeof (struct item));
        printf("\n\tPlease Enter The Name of This Item: ");
        cin.ignore();
        gets(snacksvariable -> name);
        printf("\n\tPlease Enter The Price: ");
        scanf("%d",&snacksvariable -> price);
        snacksvariable -> quantity = 10;
        snacksvariable -> nextsnacks = NULL;
        sheadvariable -> counter++;

        if (sheadvariable -> counter != 1)
            snacksvariable -> nextsnacks = sheadvariable -> pointer;
        sheadvariable -> pointer = snacksvariable;
        printf("\n\t== Successfully Added a New Snacks Item ==\n");
    }

    else if (take == 2)
    {
        mealsvariable = (struct item*) malloc(sizeof (struct item));
        printf("\n\tPlease Enter The Name of This Item: ");
        cin.ignore();
        gets(mealsvariable -> name);
        printf("\n\tPlease Enter The Price: ");
        scanf("%d",&mealsvariable -> price);
        mealsvariable -> quantity = 10;
        mealsvariable -> nextmeals = NULL;
        mheadvariable -> counter++;

        if (mheadvariable -> counter != 1)
            mealsvariable -> nextmeals = mheadvariable -> pointer;
        mheadvariable -> pointer = mealsvariable;
        printf("\n\t== Successfully Added a New Snacks Item ==\n");
    }

    else if (take == 3)
    {
        drinksvariable = (struct item*) malloc(sizeof (struct item));
        printf("\n\tPlease Enter The Name of This Item: ");
        cin.ignore();
        gets(drinksvariable -> name);
        printf("\n\tPlease Enter The Price: ");
        scanf("%d",&drinksvariable -> price);
        drinksvariable -> quantity = 10;
        drinksvariable -> nextdrinks = NULL;
        dheadvariable -> counter++;

        if (dheadvariable -> counter != 1)
            drinksvariable -> nextdrinks = dheadvariable -> pointer;
        dheadvariable -> pointer = drinksvariable;
        printf("\n\t== Successfully Added a New Snacks Item ==\n");
    }

    else
        creat();
}

void display()
{
    snacksvariable = (struct item*) malloc(sizeof (struct item));
    printf("\nCategories:\n");
    printf("\t1 = Snacks\n");
    printf("\t2 = Meal\n");
    printf("\t3 = Drinks\n");
    printf("\n\tSelect a Category: ");
    scanf("%d",&choice);
    printf("\t-----------------------------------------------------------\n");
    printf("\n\t No.\tName\t\t\tPrice\t\tQuantity\n");
    printf("\t-----------------------------------------------------------\n");
    int number = 0;
    if (choice == 1)
    {
        snackstemp = sheadvariable -> pointer;
        while (snackstemp != NULL)
        {
            number++;
            printf("\t %d.",number);
            cout << "\t" << snackstemp -> name;
            printf("\t\t %d\t\t   %d\n",snackstemp -> price, snackstemp -> quantity);
            snackstemp = snackstemp -> nextsnacks;
        }
    }

    else if (choice == 2)
    {
        mealstemp = mheadvariable -> pointer;
        while (mealstemp != NULL)
        {
            number++;
            printf("\t %d.",number);
            cout << "\t" << mealstemp -> name;
            printf("\t\t %d\t\t   %d\n",mealstemp -> price, mealstemp -> quantity);
            mealstemp = mealstemp -> nextmeals;
        }
    }

    else if (choice == 3)
    {
        drinkstemp = dheadvariable -> pointer;
        while (drinkstemp != NULL)
        {
            number++;
            printf("\t %d.",number);
            cout << "\t" << drinkstemp -> name;
            printf("\t\t %d\t\t   %d\n",drinkstemp -> price, drinkstemp -> quantity);
            drinkstemp = drinkstemp -> nextdrinks;
        }
    }
}

traverse (struct item *temp, int take, int option, int catagory)
{
    if (catagory == 1)
    {
        if (temp != NULL)
        {
            cnt++;
            if (cnt == take)
            {
                if (option == 1)
                {
                    int takequantity;
                    printf("\n\tEnter Your Updated Quantity: ");
                    scanf("%d",&takequantity);
                    temp -> quantity = takequantity;
                    printf("\n\t== Successfully Updated The Quantity ==\n");
                }

                else if (option == -1)
                {
                    int newprice;
                    printf("\n\tEnter The New Price: ");
                    scanf("%d",&newprice);
                    temp -> price = newprice;
                    printf("\n\t== Successfully Revise The Price ==\n");
                }

                else if (option == 2)
                {
                    snackstemp = temp -> nextsnacks;
                    temp -> nextsnacks = snackstemp -> nextsnacks;
                    free(snackstemp);
                    sheadvariable -> counter --;
                    printf("\n\t== Successfully Removed An Item ==\n");
                }
            }
            traverse (temp -> nextsnacks, take, option, catagory);
        }
    }

    else if (catagory == 2)
    {
        if (temp != NULL)
        {
            cnt++;
            if (cnt == take)
            {
                if (option == 1)
                {
                    int takequantity;
                    printf("\n\tEnter Your Updated Quantity: ");
                    scanf("%d",&takequantity);
                    temp -> quantity = takequantity;
                    printf("\n\t== Successfully Updated The Quantity ==\n");
                }

                else if (option == -1)
                {
                    int newprice;
                    printf("\n\tEnter The New Price: ");
                    scanf("%d",&newprice);
                    temp -> price = newprice;
                    printf("\n\t== Successfully Revise The Price ==\n");
                }

                else if (option == 2)
                {
                    mealstemp = temp -> nextmeals;
                    temp -> nextmeals = mealstemp -> nextmeals;
                    free(mealstemp);
                    mheadvariable -> counter --;
                    printf("\n\t== Successfully Removed An Item ==\n");
                }
            }
            traverse (temp -> nextmeals, take, option, catagory);
        }
    }

    else if (catagory == 3)
    {
        if (temp != NULL)
        {
            cnt++;
            if (cnt == take)
            {
                if (option == 1)
                {
                    int takequantity;
                    printf("\n\tEnter Your Updated Quantity: ");
                    scanf("%d",&takequantity);
                    temp -> quantity = takequantity;
                    printf("\n\t== Successfully Updated The Quantity ==\n");
                }

                else if (option == -1)
                {
                    int newprice;
                    printf("\n\tEnter The New Price: ");
                    scanf("%d",&newprice);
                    temp -> price = newprice;
                    printf("\n\t== Successfully Revise The Price ==\n");
                }

                else if (option == 2)
                {
                    drinkstemp = temp -> nextdrinks;
                    temp -> nextdrinks = drinkstemp -> nextdrinks;
                    free(drinkstemp);
                    dheadvariable -> counter --;
                    printf("\n\t== Successfully Removed An Item ==\n");
                }
            }
            traverse (temp -> nextdrinks, take, option, catagory);
        }
    }
}

int main()
{
    sheadvariable = (struct head*) malloc(sizeof (struct head));
    sheadvariable -> counter = 0;
    sheadvariable -> pointer = NULL;

    mheadvariable = (struct head*) malloc(sizeof (struct head));
    mheadvariable -> counter = 0;
    mheadvariable -> pointer = NULL;

    dheadvariable = (struct head*) malloc(sizeof (struct head));
    dheadvariable -> counter = 0;
    dheadvariable -> pointer = NULL;

    printf("\n\t*************** WELCOME TO THE SUPER RESTURENT ***************\n");
    printf("\t--------------------------------------------------------------\n");

    mainmenu:

    int user_choice;
    string password;
    char takepass;

    printf("\nUsers:\n");
    printf("\t1 = Admin\n\t2 = Customer\n\t0 = Exit\n\n");
    printf("\tYour Choice: ");
    scanf("%d",&user_choice);

    if (user_choice == 1)
    {
        printf("\n\tPlease Enter The Password (Maximum Length 8): ");
        takepass = _getch();
        while (takepass != 13)
        {
            password.push_back(takepass);
            printf("*");
            takepass = _getch();
        }
        printf("\n\n");
        if (password == "1234")
        {
            adminlevel:
            int adminchoice, takecategory, takenumber;
            printf("\t1 = Add a New Item.\n");
            printf("\t2 = Update Some Quantity.\n");
            printf("\t3 = Revise Some Price.\n");
            printf("\t4 = Remove Some Item.\n");
            printf("\t5 = Display The Menu.\n");
            printf("\t6 = Return Main Menu.\n");
            printf("\n\tEnter Your Choice: ");
            scanf("%d",&adminchoice);

            if (adminchoice == 1)
                creat();

            else if (adminchoice == 2 || adminchoice == 3 || adminchoice == 4)
            {
                display();
                printf("\n\tPlease Choose The Number of Your Required Item: ");
                scanf("%d",&takenumber);
                if (choice == 1)
                {
                    cnt = 0;
                    if (adminchoice == 2)
                        traverse(sheadvariable -> pointer, takenumber, 1, choice);
                    else if (adminchoice == 3)
                        traverse(sheadvariable -> pointer, takenumber, -1, choice);
                    else if (adminchoice == 4)
                    {
                        if (takenumber == 1)
                        {
                            snackstemp = sheadvariable -> pointer;
                            sheadvariable -> pointer = sheadvariable -> pointer -> nextsnacks;
                            free(snackstemp);
                            sheadvariable -> counter --;
                            printf("\n\t== Successfully Removed An Item ==\n");
                        }
                        else
                            traverse(sheadvariable -> pointer, --takenumber, 2, choice);
                    }
                }

                else if (choice == 2)
                {
                    cnt = 0;
                    if (adminchoice == 2)
                        traverse(mheadvariable -> pointer, takenumber, 1, choice);
                    else if (adminchoice == 3)
                        traverse(mheadvariable -> pointer, takenumber, -1, choice);
                    else if (adminchoice == 4)
                    {
                        if (takenumber == 1)
                        {
                            mealstemp = mheadvariable -> pointer;
                            mheadvariable -> pointer = mheadvariable -> pointer -> nextmeals;
                            free(mealstemp);
                            mheadvariable -> counter --;
                            printf("\n\t== Successfully Removed An Item ==\n");
                        }
                        else
                            traverse(mheadvariable -> pointer, --takenumber, 2, choice);
                    }
                }

                else if (choice == 3)
                {
                    cnt = 0;
                    if (adminchoice == 2)
                        traverse(dheadvariable -> pointer, takenumber, 1, choice);
                    else if (adminchoice == 3)
                        traverse(dheadvariable -> pointer, takenumber, -1, choice);
                    else if (adminchoice == 4)
                    {
                        if (takenumber == 1)
                        {
                            drinkstemp = dheadvariable -> pointer;
                            dheadvariable -> pointer = dheadvariable -> pointer -> nextdrinks;
                            free(drinkstemp);
                            dheadvariable -> counter --;
                            printf("\n\t== Successfully Removed An Item ==\n");
                        }
                        else
                            traverse(dheadvariable -> pointer, --takenumber, 2, choice);
                    }
                }
            }

            else if (adminchoice == 5)
                display();

            else if (adminchoice == 6)
                goto mainmenu;

            printf("\n");
            goto adminlevel;
        }
        else
        {
            printf("\tInvalid Password! You Cannot Access This Feature.\n");
            goto mainmenu;
        }
    }

    else if (user_choice == 0)
    {
        printf("\n\tThank You.\n");
        return 0;
    }

    else
    {
        printf("\n\tUnknown Option. Please Try Again.\n");
        goto mainmenu;
    }
}