Food Ordering System in C

Prerequisite: Modular Approach in Programming Problem Statement: Write C program to implement Food ordering with the following functionalities:

• Login & Signup
• Search by Food
• Search by hotels
• Cart & Order Confirmation

Approach and Functionality:

Signup Functionality

This is the main function for signup, From here we are calling the account_check() function to validate the inputs. Following are the functionalities:

• Input the username, age, email, password, confirm the password, and mobile number.
• Validate the inputs
  • Username must contain alphabets.
  • Age must be greater than and not equal to 0.
  • Email must contain @, a comma and length should be greater than 5.
  • Passwords must contain length between 8 to 12 with at least one uppercase, lowercase, number and special character. Both password and confirm password should be the same.
  • Mobile number should contain numbers and exactly 10 digits.

After the successful validation of all input fields, it checks whether the same account already exists or not through account_check() functionality.

Login Functionality

This function implements the login features of our project. While login, the Email, and Password are validated and checked whether it is already signed up. After the successful login, there is an option to choose either Search_by_food() or Search_by_hotels() functionalities.

Order by Hotel

In this functionality, the food order is placed after selecting any Hotel. Once the hotel is selected the list of food is displayed with their respective costs. Once the food is selected, you need to go to option Select Cart for the successful ordering of the foods.

Before ordering by the hotel, initialize some default hotels which we are given locally through structures in C for our demonstration. Once the hotels and their respective foods are initialized dynamically, it will display the list of hotels.

Order by Food

Once the hotel is selected in the above step, select the food and enter the number of items to order. Once the selection of all the foods is done it will display the total amount of food selected. Move to Select Cart for the successful ordering of the foods.

Cart

This functionality perform the following:

• Display the total cost of your orders.
• Confirm your order and enjoy your food.

Initialization

// C program to initialize the Food
// Ordering System
// Initialization
#include <stdio.h>

// Structure to store the user details
// i.e., Signup details
struct details {
    char uname[100];
    int age;
    char password[100];
    char email[100];
    char mobile[10];
};

// Structure to store the hotels
// and their food details
struct hotels {
    char hotel[100];
    char first_food[20];
    char second_food[20];
    char third_food[20];
    char fourth_food[25];
    int first, second, third, fourth;
};

// Initialize the hotels and details
struct hotels m[5];
struct details s[100];

// Function to get the input for
// a new account
void signup();

// Function to check whether account
// is already existed or not
void account_check();

// Function to validate all input fields
int validate();
void login();
void cart();
void search_by_hotels();
void search_by_food();
void food_order(int food);

// Function to initialize the hotels and
// food structure dynamically
void hotel_initialize();
void hotels(int hotel_choice);

int flag = 1, i, j = 0, count = 0, caps = 0;
int small = 0, special = 0, numbers = 0;
int success = 0, x, choice;
char temp_name[100], temp_password1[100];
char temp_password2[100], temp_email[100];
char temp_mobile[100];

int temp_age, total = 0, food_choice, n;
int hotel_choice, search_choice, confirm;
int ch, food, hotel_id;

Boilerplate

// C program to implement Boilerplate
// Code for the Food Ordering System
int main()
{
    while (1) {
        printf("\n\nWelcome to Food ");

        printf("Ordering System"
               "\n\n1)SIGNUP\n");
        printf("2)LOGIN\n3)EXIT\n\n");
        printf("Enter your choice\t");
        scanf("%d", &choice);

        // Switch Cases
        switch (choice) {

        // For Signup Function
        case 1: {
            signup();
            break;
        }

        // For Login Function
        case 2: {
            login();
            break;
        }
        case 3: {
            exit(1);
        }
        default: {
                printf("\nPlease Enter the "
                printf("valid choice\n");
                break;
        }
        }
    }
}

Signup

// Function to create a new user for
// the Food ordering system
void signup()
{
    printf("Enter Your name\t");
    scanf("%s", temp_name);

    printf("Enter Your Age\t");
    scanf("%d", &temp_age);

    printf("Enter Your Email\t");
    scanf("%s", temp_email);

    printf("Enter Password\t");
    scanf("%s", temp_password1);

    printf("Confirm Password\t");
    scanf("%s", temp_password2);

    printf("Enter Your Mobile Number\t");
    scanf("%s", temp_mobile);

    // Function Call to validate
    // the user creation
    x = validate();
    if (x == 1)
        account_check();
}

Validate

// Function to validate the user for
// the signup process
int validate()
{
    // Validate the name
    for (i = 0; temp_name[i] != '\0'; i++) {
        if (!((temp_name[i] >= 'a' && temp_name[i] <= 'z')
              || (temp_name[i] >= 'A'
                  && temp_name[i] <= 'Z'))) {
            printf("\nPlease Enter the"
            printf("valid Name\n");
            flag = 0;
            break;
        }
    }
    if (flag == 1) {
        count = 0;

        // Validate the Email ID
        for (i = 0;
             temp_email[i] != '\0'; i++) {
            if (temp_email[i] == '@'
                || temp_email[i] == '.')
                count++;
        }
        if (count >= 2
            && strlen(temp_email) >= 5) {
            // Validating the password
            // check if it matches with
            // correct password or not
            if (!strcmp(temp_password1,
                        temp_password2)) {
                if (strlen(temp_password1) >= 8
                    && strlen(temp_password1) <= 12) {
                    caps = 0;
                    small = 0;
                    numbers = 0;
                    special = 0;
                    for (i = 0;
                         temp_password1[i]
                         != '\0';
                         i++) {
                        if (temp_password1[i] >= 'A'
                            && temp_password1[i] <= 'Z')
                            caps++;
                        else if (temp_password1[i] >= 'a'
                                 && temp_password1[i]
                                        <= 'z')
                            small++;
                        else if (temp_password1[i] >= '0'
                                 && temp_password1[i]
                                        <= '9')
                            numbers++;
                        else if (temp_password1[i] == '@'
                                 || temp_password1[i] == '&'
                                 || temp_password1[i] == '#'
                                 || temp_password1[i]
                                        == '*')
                            special++;
                    }
                    if (caps >= 1 && small >= 1
                        && numbers >= 1 && special >= 1) {
                        // Validating the Input age
                        if (temp_age != 0 && temp_age > 0) {
                            // Validating the Input mobile
                            // number
                            if (strlen(temp_mobile) == 10) {
                                for (i = 0; i < 10; i++) {
                                    if (temp_mobile[i]
                                            >= '0'
                                        && temp_mobile[i]
                                               <= '9') {
                                        success = 1;
                                    }
                                    else {
                                        printf("\n\nPlease");
                                        printf("Enter Valid ");
                                        printf("Mobile "
                                               "Number\n\n");
                                        return 0;
                                        break;
                                    }
                                }

                                // Success is assigned with
                                // value 1, Once every
                                // inputs are correct.
                                if (success == 1)
                                    return 1;
                            }
                            else {
                                printf("\n\nPlease Enter the");
                                printf("10 digit mobile");
                                printf("number\n\n");
                                return 0;
                            }
                        }
                        else {
                            printf("\n\nPlease Enter ");
                            printf("the valid age\n\n");
                            return 0;
                        }
                    }
                    else {
                        printf("\n\nPlease Enter the");
                        printf("strong password, Your ");
                        printf("password must contain ");
                        printf("atleast one uppercase, ");
                        printf("Lowercase, Number and ");
                        printf("special character\n\n");
                        return 0;
                    }
                }
                else {
                    printf("\nYour Password is very");
                    printf("short\nLength must ");
                    printf("between 8 to 12\n\n");
                    return 0;
                }
            }
            else {
                printf("\nPassword "
                       "Mismatch\n\n");
                return 0;
            }
        }
        else {
            printf("\nPlease Enter Valid E-Mail\n\n");
            return 0;
        }
    }
}

Login

// Function to Login the users
void login()
{
    printf("\n\nLOGIN\n\n");
    printf("\nEnter Your Email\t");
    scanf("%s", temp_email);

    printf("Enter Your Password\t");
    scanf("%s", temp_password1);

    for (i = 0; i < 100; i++) {
        // Check whether the input email
        // is already existed or not
        if (!strcmp(s[i].email, temp_email)) {
            // Check whether the password
            // is matched with email or not
            if (!strcmp(s[i].password, temp_password1)) {
                printf("\n\nWelcome %s, ");
                printf("Your are successfully ");
                printf("logged in\n\nWe Provide ");
                printf("two ways of search\n1) ");
                printf("Search By Hotels\n2) ");
                printf("Search by Food\n3) ");
                printf("Exit\n\nPlease Enter");
                printf("your choice\t", s[i].uname);
                scanf("%d", &search_choice);

                // Get the input whether
                // the user are going to search
                // /Order by hotels or search/
                // order by food
                switch (search_choice) {
                case 1: {
                    search_by_hotels();
                    break;
                }
                case 2: {
                    search_by_food();
                    break;
                }
                case 3: {
                    exit(1);
                }
                default: {
                    printf("Please Enter ");
                    printf("the valid choice\n\n");
                    break;
                }
                }
                break;
            }
            else {
                printf("\n\nInvalid Password! ");
                printf("Please Enter the ");
                printf("correct password\n\n");
                main();
                break;
            }
        }
        else {
            printf("\n\nAccount doesn't ");
            printf("exist, Please signup!!\n\n");
            main();
            break;
        }
    }
}

Hotel Initialization

// Function that initializes the
// Hotels
void hotel_initialize()
{
    // Initialize the structure with
    // Aarya_bhavan hotel and some
    // foods name with their cost
    strcpy(m[1].hotel, "Aarya_Bhavan");
    strcpy(m[1].first_food, "Sandwich");
    strcpy(m[1].second_food, "Pizza");
    strcpy(m[1].third_food, "Fried_Rice");
    m[1].first = 70;
    m[1].second = 100;
    m[1].third = 95;

    // Initialize the structure with
    // Banu_Hotel and some foods name
    // and their respective costs
    strcpy(m[2].hotel, "Banu_Hotel");
    strcpy(m[2].first_food, "Parotta");
    strcpy(m[2].second_food, "Noodles");
    strcpy(m[2].third_food, "Chicken_Rice");
    m[2].first = 15;
    m[2].second = 75;
    m[2].third = 80;

    // Initialize the structure with
    // SR_Bhavan hotel and some foods
    // name and their respective costs
    strcpy(m[3].hotel, "SR_Bhavan");
    strcpy(m[3].first_food, "Chicken_Biriyani");
    strcpy(m[3].second_food, "Prawn");
    strcpy(m[3].third_food, "Faloda");
    m[3].first = 90;
    m[3].second = 120;
    m[3].third = 35;
}

Search by Hotels

// Function that implements the
// functionality search by hotels
void search_by_hotels()
{
    hotel_initialize();
    printf("\n\nPlease Choose the");
    printf("hotels\n\n1) %s\n2) %s\n3) %s",
           m[1].hotel,
           m[2].hotel, m[3].hotel);
    printf("\n4) Exit\n\nPlease ");
    printf("select the hotel\t");

    scanf("%d", &hotel_choice);

    if (hotel_choice > 4) {
        printf("Please Enter the");
        printf("valid choice\n\n");
        search_by_hotels();
    }
    else if (hotel_choice == 4)
        exit(1);
    else
        hotels(hotel_choice);
}

void hotels(int hotel_choice)
{
    total = 0;
    while (1) {
        // Displays the list of foods
        // available in selected hotel
        printf("\n\nList of foods available");
        printf("in %s\n\n1) %s\tRs: %d\n2)",
               m[hotel_choice].hotel,
               m[hotel_choice].first_food,
               m[hotel_choice].first);

        printf("%s\tRs: %d\n3) %s\tRs: %d\n4)",
               m[hotel_choice].second_food,
               m[hotel_choice].second,
               m[hotel_choice].third_food,
               m[hotel_choice].third);

        printf("Cart\n5) Exit\n\nPlease Enter");
        printf("Your Choice\t");
        scanf("%d", &food_choice);

        // Get the input for no. of foods
        // to calculate the total amount
        if (food_choice == 1) {
            printf("Please Enter the ");
            printf("Count of %s\t",
                   m[hotel_choice].first_food);
            scanf("%d", &n);

            total = total
                    + (n * m[hotel_choice].first);
        }
        else if (food_choice == 2) {
            printf("Please Enter Count");
            printf("of %s\t",
                   m[hotel_choice].second_food);
            scanf("%d", &n);
            total = total
                    + (n * m[hotel_choice].second);
        }
        else if (food_choice == 3) {
            printf("Please Enter the Count");
            printf("of %s\t",
                   m[hotel_choice].third_food);
            scanf("%d", &n);
            total = total
                    + (n * m[hotel_choice].third);
        }

        // Once the user, completed their
        // order, they can go to cart
        // by giving choice as 4.
        else if (food_choice == 4) {
            cart();
        }
        else if (food_choice == 5) {
            search_by_hotels();
        }
        else {
            printf("Please Enter the");
            printf("valid Choice\n\n");
        }
    }
}

Search by Food

// Function to implement the
// search by food
void search_by_food()
{
    total = 0;

    // Initialize all the hotels
    // and their foods
    hotel_initialize();
    while (1) {
        printf("\n\nPlease choose the ");
        printf("food\n\n1) %s\t%d\n2) %s\t%d",
               m[1].first_food, m[1].first,
               m[1].second_food, m[1].second);

        printf("\n3) %s\t%d\n4) %s\t%d\n",
               m[1].third_food, m[1].third,
               m[2].first_food, m[2].first);

        printf("5) %s\t%d\n6) %s\t%d\n",
               m[2].second_food, m[2].second,
               m[2].third_food, m[2].third);
        printf("7) %s\t%d\n8) %s\t%d\n",
               m[3].first_food, m[3].first,
               m[3].second_food, m[3].second);
        printf("9) %s\t%d\n10) Cart\n",
               m[3].third_food,
               m[3].third);
        printf("11) Exit");

        printf("\nPlease Enter Your Choice\t");
        scanf("%d", &food);
        if (food > 10) {
            printf("Please Enter the ");
            printf("valid choice\n\n");
            search_by_food();
        }
        // Moves to the cart
        // functionality
        else if (food == 10)
            cart();
        else if (food == 11)
            exit(1);
        // Call food_order functionality
        // to get the no of foods and
        // to calculate the total
        // amount of the order.
        else
            food_order(food);
    }
}

Cart

// Function to implement the cart
void cart()
{
    printf("\n\n\n\n--------------Cart");
    printf("----------------");
    printf("\nYour Total Order");
    printf("Amount is %d\n", total);
    printf("\n\nDo You wish to");
    printf("order (y=1/n=0):");
    scanf("%d", &ch);
    if (ch == 1) {
        printf("\n\nThank You for your");
        printf("order!! Your Food is on ");
        printf("the way. Welcome again!!\n\n");
        exit(1);
    }
    else if (ch == 0) {
        printf("Do You want to exit -1");
        printf("or Go back -0");
        scanf("%d", &confirm);
        if (confirm == 1) {
            printf("\n\nOops! Your order is");
            printf("cancelled!! Exiting..");
            printf("Thank You visit again!\n");
            exit(1);
        }
        else {
            printf("\n\nThank You\n\n");
            login();
        }
    }
    else {
        printf("\n\nPlease Enter the ");
        printf("correct choice\n\n");
        cart();
    }
}

Complete Code

// C program to implement the Food
// Ordering System
#include <stdio.h>
#include <string.h>

// Structure to store the
// user details (Signup details)
struct details {
    char uname[100];
    int age;
    char password[100];
    char email[100];
    char mobile[10];
};

// Structure to store the
// hotels and their food details
struct hotels {
    char hotel[100];
    char first_food[20];
    char second_food[20];
    char third_food[20];
    char fourth_food[25];
    int first, second, third, fourth;
};

struct hotels m[5];
struct details s[100];

// Function to get the
// input for new account.
void signup();

// Function to check whether
// the account is already
// existed or not
void account_check();

// Function to validate
// all the input fields.
int validate();
void login();
void cart();
void search_by_hotels();
void search_by_food();
void food_order(int food);

// Function to initialize the
// hotels and food
// structure dynamically
void hotel_initialize();
void hotels(int hotel_choice);
int flag = 1, i, j = 0, count = 0, caps = 0;
int small = 0, special = 0, numbers = 0;
int success = 0, x, choice;
char temp_name[100], temp_password1[100];
char temp_password2[100], temp_email[100];
char temp_mobile[100];
int temp_age, total = 0, food_choice, n;
int hotel_choice, search_choice, confirm;
int ch, food, hotel_id;

// Boilerplate Code for the
// Food Ordering System
int main()
{
    while (1) {
        printf("\n\n********************Welcome to Food Ordering System**************** ");
        printf("\n\n1)SIGNUP\n");
        printf("2)LOGIN\n3)EXIT\n\n");
        printf("Enter your choice:");
        scanf("%d", &choice);
        switch (choice) {
        case 1: {
            signup();
            break;
        }
        case 2: {
            login();
            break;
        }
        case 3: {
            printf("\n**********************Thank you visit again*******************\n");
            exit(0);
            return 0;
        }
        default: {
            printf("\nPlease Enter the valid choice\n");
            break;
        }
        }
    }
}

// Function to create a new
// user for the Food ordering
// system
void signup()
{
      printf("\n\n************Welcome to signup page*************\n");
    printf("\tEnter Your name: ");
    scanf("%s", temp_name);

    printf("\tEnter Your Age: ");
    scanf("%d", &temp_age);

    printf("\tEnter Your Email: ");
    scanf("%s", temp_email);

    printf("\tEnter Password: ");
    scanf("%s", temp_password1);

    printf("\tConfirm Password:");
    scanf("%s", temp_password2);

    printf("\nEnter Your Mobile Number: ");
    scanf("%s", temp_mobile);

    // Function Call to validate
    // the user creation
    x = validate();
    if (x == 1){
        account_check();
         login();
    }
}

// Function to validate the user
// for signup process
int validate()
{
    // Validate the name
    for (i = 0; temp_name[i] != '\0'; i++) {
        if (!((temp_name[i] >= 'a' && temp_name[i] <= 'z')
              || (temp_name[i] >= 'A'
                  && temp_name[i] <= 'Z'))) {
            printf("\nPlease Enter the valid Name\n");
            flag = 0;
            break;
        }
    }
    if (flag == 1) {
        count = 0;

        // Validate the Email ID
        for (i = 0;temp_email[i] != '\0'; i++) {
            if (temp_email[i] == '@'|| temp_email[i] == '.')
                count++;
        }
        if (count >= 2&& strlen(temp_email) >= 5) {
            // Validating the Password and
            // Check whether it matches
            // with Conform Password
            if (!strcmp(temp_password1,
                        temp_password2)) {
                if (strlen(temp_password1) >= 8
                    && strlen(temp_password1) <= 12) {
                    caps = 0;
                    small = 0;
                    numbers = 0;
                    special = 0;
                    for (i = 0; temp_password1[i] != '\0';
                         i++) {
                        if (temp_password1[i] >= 'A'
                            && temp_password1[i] <= 'Z')
                            caps++;
                        else if (temp_password1[i] >= 'a'
                                 && temp_password1[i]
                                        <= 'z')
                            small++;
                        else if (temp_password1[i] >= '0'
                                 && temp_password1[i]
                                        <= '9')
                            numbers++;
                        else if (temp_password1[i] == '@'
                                 || temp_password1[i] == '&'
                                 || temp_password1[i] == '#'
                                 || temp_password1[i]
                                        == '*')
                            special++;
                    }
                    if (caps >= 1 && small >= 1
                        && numbers >= 1 && special >= 1) {
                        // Validating the Input age
                        if (temp_age != 0 && temp_age > 0) {
                            // Validating the Input mobile
                            // number
                            if (strlen(temp_mobile) == 10) {
                                for (i = 0; i < 10; i++) {
                                    if (temp_mobile[i]
                                            >= '0'
                                        && temp_mobile[i]
                                               <= '9') {
                                        success = 1;
                                    }
                                    else {
                                        printf("\n\nPlease Enter Valid mobile Number\n\n");
                                        return 0;
                                        break;
                                    }
                                }

                                // Success is assigned with
                                // value 1, Once every
                                // inputs are correct.
                                if (success == 1)
                                    return 1;
                            }
                            else {
                                printf("\n\nPlease Enter the 10 digit mobile number\n");
                                return 0;
                            }
                        }
                        else {
                            printf("\n\nPlease Enter the valid age\n\n");
                            return 0;
                        }
                    }
                    else {
                        printf("\n\nPlease Enter the");
                        printf("strong password, Your ");
                        printf("password must contain ");
                        printf("atleast one uppercase, ");
                        printf("Lowercase, Number and ");
                        printf("special character\n\n");
                        return 0;
                    }
                }
                else {
                    printf("\nYour Password is very short\nLength must between 8 to 12\n\n");
                    return 0;
                }
            }
            else {
                printf("\nPassword Mismatch\n\n");
                return 0;
            }
        }
        else {
            printf("\nPlease Enter Valid E-Mail\n\n");

            return 0;
        }
    }
}

// Function to check if the account
// already exists or not
void account_check()
{
    for (i = 0; i < 100; i++) {
        // Check whether the email
        // and password are already
        // matched with existed account
        if (!(strcmp(temp_email, s[i].email)
              && strcmp(temp_password1,
                        s[i].password))) {
            printf("\n\nAccount Already Existed. Please Login !!\n\n");
            main();
            break;
        }
    }
    // if account does not already
    // existed, it creates a new
    // one with new inputs
    if (i == 100) {
        strcpy(s[j].uname, temp_name);
        s[j].age = temp_age;
        strcpy(s[j].password, temp_password1);
        strcpy(s[j].email, temp_email);
        strcpy(s[j].mobile, temp_mobile);
        j++;
        printf("\n\n\nAccount Successfully Created!!\n\n");
    }
}

// Function to Login the users
void login()
{
      printf("\n\n**************Welcome to Login page ****************\n\n");

    printf("\tEnter Your Email: ");
    scanf("%s", temp_email);
    printf("\tEnter Your Password: ");
    scanf("%s", temp_password1);
    for (i = 0; i < 100; i++) {
        // Check whether the input
        // email is already existed or not
        if (!strcmp(s[i].email, temp_email)) {
            // Check whether the password
            // is matched with the email or not
            if (!strcmp(s[i].password, temp_password1)) {
                printf("\n\nWelcome %s, ", s[i].uname);
                printf("Your are successfully ");
                printf("logged in\n\n ");
                printf("We Provide two ways of search\n ");
                printf("1) Search By Hotels\n ");
                printf("2) Search by Food\n ");
                printf("3)Exit\n\n");
                printf("Please Enteyour choice:");
                scanf("%d", &search_choice);

                // Getting the input whether
                // the user are going to search
                // /Order by hotels or search/
                // order by food.
                switch (search_choice) {
                case 1: {
                    search_by_hotels();
                    break;
                }
                case 2: {
                    search_by_food();
                    break;
                }
                case 3: {
                    // exit(1);
                      main();
                    return;
                }
                default: {
                    printf("Please Enter the valid choice\n\n ");
                    break;
                }
                }
                break;
            }
            else {
                printf("\n\nInvalid Password! ");
                printf("Please Enter the correct password\n\n");
                main();
                break;
            }
        }
        else {
            printf("\n\nAccount doesn't exist,Please signup!!\n\n ");
            main();
            break;
        }
    }
}

// Function to implement the Hotel
// initializer
void hotel_initialize()
{
    // Initializing the structure
    // with Aarya_bhavan hotel and
    // some foods name and
    // their respective costs.
    strcpy(m[1].hotel, "Aarya_Bhavan");
    strcpy(m[1].first_food, "Sandwich");
    strcpy(m[1].second_food, "Pizza");
    strcpy(m[1].third_food, "Fried_Rice");
      strcpy(m[1].fourth_food,"Ice_Cream");
    m[1].first = 70;
    m[1].second = 100;
    m[1].third = 95;
      m[1].fourth=50;

    // Initializing the structure with
    // Banu_Hotel and some foods name
    // and their respective costs.
    strcpy(m[2].hotel, "Banu_Hotel");
    strcpy(m[2].first_food, "Parotta");
    strcpy(m[2].second_food, "Noodles");
    strcpy(m[2].third_food, "Chicken_Rice");
      strcpy(m[2].fourth_food,"Dosa");
    m[2].first = 15;
    m[2].second = 75;
    m[2].third = 80;
      m[2].fourth=50;

    // Initializing the structure with
    // SR_Bhavan hotel and some foods
    // name and their respective costs.
    strcpy(m[3].hotel, "SR_Bhavan");
    strcpy(m[3].first_food, "Chicken_Biriyani");
    strcpy(m[3].second_food, "Prawn");
    strcpy(m[3].third_food, "Faloda");
    strcpy(m[3].fourth_food,"burger");
    m[3].first = 90;
    m[3].second = 120;
    m[3].third = 35;
      m[4].fourth=50;
}

// Function to implement the search
// by hotels
void search_by_hotels()
{
    hotel_initialize();
    printf(""
           "\n\nPlease Choose the");
    printf("hotels\n\n1) %s\n2) %s\n3) %s",
           m[1].hotel,
           m[2].hotel, m[3].hotel);
    printf("\n4) Exit\n\nPlease ");
    printf("select the hotel\t");
    scanf("%d", &hotel_choice);
    if (hotel_choice > 4) {
        printf("Please Enter the");
        printf("valid choice\n\n");
        search_by_hotels();
    }
    else if (hotel_choice == 4)
        // exit(1);
        return;
    else
        hotels(hotel_choice);
}

// Function to implement the hotel
void hotels(int hotel_choice)
{
    total = 0;
    while (1) {
        // Displays the list of
        // foods available in
        // selected hotel
        printf("\n\nList of foods available");

        printf("in %s\n\n1) %s\tRs: %d\n2)",
               m[hotel_choice].hotel,
               m[hotel_choice].first_food,
               m[hotel_choice].first);

        printf("%s\tRs: %d\n3) %s\tRs: %d\n4)",
               m[hotel_choice].second_food,
               m[hotel_choice].second,
               m[hotel_choice].third_food,
               m[hotel_choice].third);

        printf("Cart\n5) Exit\n\nPlease Enter");
        printf("Your Choice\t");
        scanf("%d", &food_choice);

        // Get the input for no
        // of foods to calculate
        // the total amount
        if (food_choice == 1) {
            printf("Please Enter the ");
            printf("Count of %s\t",
                   m[hotel_choice].first_food);
            scanf("%d", &n);
            total = total
                    + (n * m[hotel_choice].first);
        }
        else if (food_choice == 2) {
            printf("Please Enter the Count");
            printf("of %s\t",
                   m[hotel_choice].second_food);
            scanf("%d", &n);
            total = total
                    + (n * m[hotel_choice].second);
        }
        else if (food_choice == 3) {
            printf("Please Enter the Count");
            printf("of %s\t",
                   m[hotel_choice].third_food);
            scanf("%d", &n);
            total = total
                    + (n * m[hotel_choice].third);
        }

        // Once the user, completed their
        // order, they can go to cart
        // by giving choice as 4.
        else if (food_choice == 4) {
            cart();
        }
        else if (food_choice == 5) {
            search_by_hotels();
        }
        else {
            printf("Please Enter the");
            printf("valid Choice\n\n");
        }
    }
}

void search_by_food()
{
    total = 0;
    // Initialize all the
    // hotels and their foods
    hotel_initialize();
    while (1) {
        printf("\n\nPlease choose the ");
        printf("food\n\n1) %s\t%d\n2) %s\t%d",
               m[1].first_food, m[1].first,
               m[1].second_food, m[1].second);

        printf("\n3) %s\t%d\n4) %s\t%d\n",
               m[1].third_food, m[1].third,
               m[2].first_food, m[2].first);

        printf("5) %s\t%d\n6) %s\t%d\n",
               m[2].second_food, m[2].second,
               m[2].third_food, m[2].third);

        printf("7) %s\t%d\n8) %s\t%d\n",
               m[3].first_food, m[3].first,
               m[3].second_food, m[3].second);

        printf("9) %s\t%d\n10) Cart\n",
               m[3].third_food,
               m[3].third);
        printf("11) Exit");
        printf("\nPlease Enter Your Choice\t");
        scanf("%d", &food);
        if (food > 10) {
            printf("Please Enter the ");
            printf("valid choice\n\n");
            search_by_food();
        }
        // Moves to the cart
        // functionality
        else if (food == 10)
            cart();
        else if (food == 11)
            // exit(1);
            return;
        // Call food_order functionality
        // to get the no of foods and
        // to calculate the total
        // amount of the order.
        else
            food_order(food);
    }
}

// Function to implement the food
// order functionality
void food_order(int food)
{
    if (food >= 1 && food <= 3)
        hotel_id = 1;
    else if (food >= 4 && food <= 6)
        hotel_id = 2;
    else
        hotel_id = 3;
    if ((food % 3) == 1) {
        printf("Please Enter the");
        printf(" Count of %s\t",
               m[hotel_id].first_food);
        scanf("%d", &n);
        total = total + (n * m[hotel_id].first);
    }
    else if ((food % 3) == 2) {
        printf("Please Enter the ");
        printf("Count of %s\t",
               m[hotel_id].second_food);
        scanf("%d", &n);
        total = total + (n * m[hotel_id].second);
    }
    else if ((food % 3) == 0) {
        printf("Please Enter the ");
        printf("Count of %s\t",
               m[hotel_id].third_food);
        scanf("%d", &n);
        total = total + (n * m[hotel_id].third);
    }
}

// Function to implement the cart
void cart()
{
    printf("\n\n\n\n*************Cart***************");
    printf("\nYour Total Order");
    printf("Amount is: %d\n", total);
    printf("\n\nDo You wish to");
    printf("order (y=1/n=0): ");
    scanf("%d", &ch);
    if (ch == 1) {
        printf("\n\nThank You for your");
        printf("order!! Your Food is on ");
        printf("the way. Welcome again!!\n\n");
        // exit(1);
        return;
    }
    else if (ch == 0) {
        printf("Do You want to exit =-1");
        printf("or Go back =0");
        scanf("%d", &confirm);
        if (confirm == 1) {
            printf("\n\nOops! Your order is");
            printf("cancelled!! Exiting..");
            printf("Thank You visit again!\n");
            // exit(1);
            return;
        }
        else {
            printf("\n\nThank You\n\n");
            login();
        }
    }
    else {
        printf("\n\nPlease Enter the ");
        printf("correct choice\n\n");
        cart();
    }
}

Output:

Boilerplate Code:

Signup:

Login:

Validate:

Account Check:

Account Already exist:

Account doesn’t Exist:

Search By Hotels:

Search By Food:

Cart: