Shopping Cart Project Using C Language

Last Updated : 17 Jan, 2023

Online Shopping applications are one of the favorite applications out of all online applications. It is a very much used application in everyone’s life. So, Let’s try to create a Shopping cart using C language which can perform basic tasks for us.

The functionality of the Shopping Cart

Although online Shopping has many functionalities we can’t include all of them. So, a few Functionalities of the shopping cart can use are mentioned below:

Signup
Login
Search items
Bill

Approach and Functionality

Signup Functionality

This is the main function for a signup, Here we will check whether the account exists or not if not we will create a new account Following are the functionalities: Inputs are username, age, email, password, confirm the password, and mobile number.
Validate the inputs input data should be valid otherwise account will not create. After successful signup, you will be directly redirected to the login page

Login

This function implements the login features of our project. While login in, 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_items or search by shops.

Order by Shop

In this functionality, the item is placed after selecting any shop. Once the shop is selected the list of items is displayed with their respective costs. Once the item is selected, you need to go to the option Select Cart for the successful ordering of the items.

Cart

This function will show you the Total cost of your order

Data Input Conditions

Conditions for the data to be input on Sign up page are mentioned below:

Name: must contain the alphabet.
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 lengths between 8 to 12 with at least one uppercase, lowercase, number, and special character. Both password and confirm password should be the same.
Mobile numbers: should contain numbers and exactly 10 digits.

Login Page

The login page asks about the data before we can enter the main home page where we can shop. The data to be inserted are Email and Password. Both email and password should be matching with the data entry or the process to log in will fail.

Main Program:

C

// C Program to implement 
// Shopping Cart 
#include <ctype.h> 
#include <math.h> 
#include <stdio.h> 
#include <string.h> 
#include <time.h> 
  
  
// Structure declared for storing 
// details 
struct details { 
    char uname[50]; 
    int age; 
    char password[100]; 
    char email[100]; 
    char mobile[10]; 
}; 
  
// Structure to store details about 
// shops 
struct Shops { 
    char shop[100]; 
    char item1[20]; 
    char item2[20]; 
    char item3[20]; 
    char item4[25]; 
    int first, second, third, fourth; 
}; 
  
// Array of Structure declared 
struct Shops m[5]; 
struct details s[100]; 
  
void signup(); 
  
void account_validate(); 
int validate(); 
void login(); 
void cart(); 
void shop(); 
void items(); 
void item_order(int item); 
  
void shop_initialize(); 
void Shop(int shop_choice); 
  
// Global variables declared 
char t_name[100], t_password1[100]; 
char t_password2[100], t_email[100]; 
char t_mobile[100]; 
int flag = 1, i, j = 0, count = 0, caps = 0; 
int Small = 0,total = 0 ,success = 0,special = 0, numbers = 0; 
int x, choice,t_age,  item_choice, n,shop_choice, search_choice, confirm,ch, item, shop_id; 
  
  
// Driver code 
int main() 
{ 
    // Loop while till which runs till break is called 
    while (1) { 
  
        // First Page 
        printf("\n\n\t******************Welcome to Shop "
               "Cart*******************\n"); 
        printf("\n\n1)SIGNUP"); 
        printf("\n2)LOGIN"); 
        printf("\n3)EXIT"); 
  
        // Asking for choice 
        printf("\n\n\nEnter your choice : "); 
        scanf("%d", &choice); 
  
  
        // Switch used to check the input 
        // choice 
        switch (choice) { 
        case 1: { 
            // Signup function called 
            signup(); 
            break; 
        } 
        case 2: { 
            // Login function called 
            login(); 
            break; 
        } 
        case 3: { 
            printf( 
                "\n\t*************************Thank you "
                "Visit Again***********************\n\n"); 
  
            // close the program 
            return 0; 
        } 
        default: { 
  
            // Choice entered is not correct 
            printf("\n\nPlease enter valid choice!!\n"); 
            break; 
        } 
        } 
    } 
} 
  
  
// Signup function declared 
void signup() 
{ 
  
    printf("\n\n\t******************"
           "Welcome to Signup "
           "Page****************"
           "*\n\n"); 
  
    // Taking name as input 
    printf("\tEnter Your name : "); 
    scanf("%s", t_name); 
  
    // Taking email as input 
    printf("\tEnter Your Email : "); 
    scanf("%s", t_email); 
  
    // Taking password as input 
    printf("\tEnter Password : "); 
    scanf("%s", t_password1); 
  
    // Taking Confirm Password as input 
    printf("\tConfirm Password : "); 
    scanf("%s", t_password2); 
  
    // Taking Mobile number as input 
    printf("\tEnter Your Mobile Number : "); 
    scanf("%s", t_mobile); 
  
    // Taking Age as input 
    printf("\tEnter Your Age : "); 
    scanf("%d", &t_age); 
  
    x = validate(); 
    if (x == 1) { 
  
        // Calling account_validate to check 
        // if entered details follows the defined 
        // rules 
        account_validate(); 
  
        // login function appears 
        login(); 
    } 
} 
  
// Signup process 
int validate() 
{ 
    // Name Validation 
    for (i = 0; t_name[i] != '\0'; i++) { 
        if (!((t_name[i] >= 'a' && t_name[i] <= 'z') 
              || (t_name[i] >= 'A' && t_name[i] <= 'Z'))) { 
            printf("\nPlease enter the valid Name!\n"); 
            flag = 0; 
            break; 
        } 
    } 
    if (flag == 1) { 
        count = 0; 
        // Email ID Validation 
        for (i = 0; t_email[i] != '\0'; i++) { 
            if (t_email[i] == '@' || t_email[i] == '.') 
                count++; 
        } 
        if (count >= 2 && strlen(t_email) >= 5) { 
            // Password Validation 
            if (!strcmp(t_password1, t_password2)) { 
                if (strlen(t_password1) >= 8 
                    && strlen(t_password1) <= 12) { 
                    caps = 0; 
                    Small = 0; 
                    numbers = 0; 
                    special = 0; 
                    for (i = 0; t_password1[i] != '\0'; 
                         i++) { 
                        if (t_password1[i] >= 'A'
                            && t_password1[i] <= 'Z') 
                            caps++; 
                        else if (t_password1[i] >= 'a'
                                 && t_password1[i] <= 'z') 
                            Small++; 
                        else if (t_password1[i] >= '0'
                                 && t_password1[i] <= '9') 
                            numbers++; 
                        else if (t_password1[i] == '@'
                                 || t_password1[i] == '&'
                                 || t_password1[i] == '#'
                                 || t_password1[i] == '*') 
                            special++; 
                    } 
                    if (caps >= 1 && Small >= 1 
                        && numbers >= 1 && special >= 1) { 
                        // Age Validation 
                        if (t_age != 0 && t_age > 0) { 
                            // Mobile Validation 
                            if (strlen(t_mobile) == 10) { 
                                for (i = 0; i < 10; i++) { 
                                    if (t_mobile[i] >= '0'
                                        && t_mobile[i] 
                                               <= '9') { 
                                        success = 1; 
                                    } 
                                    else { 
                                        printf( 
                                            "\n\nPlease"); 
                                        printf( 
                                            "Enter Valid "); 
                                        printf( 
                                            "Mobile "
                                            "Number\n\n"); 
                                        return 0; 
                                        break; 
                                    } 
                                } 
  
                                // Success flag to know 
                                // every inputs are valid 
                                if (success == 1) 
                                    return 1; 
                            } 
                            else { 
                                printf("\n\nPlease Enter "
                                       "the 10 digit "
                                       "mobile number\n\n"); 
                                return 0; 
                            } 
                        } 
                        else { 
                            printf("\n\nPlease Enter the "
                                   "valid age\n\n"); 
                            return 0; 
                        } 
                    } 
                    else { 
                        printf( 
                            "\n\nPlease Enter the strong "
                            "password, Your password must "
                            "contain atleast one "
                            "uppercase,Lowercase, Number "
                            "and 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; 
        } 
    } 
} 
  
// Account Validation 
void account_validate() 
{ 
    for (i = 0; i < 100; i++) { 
        // Check account already exist 
        if (!(strcmp(t_email, s[i].email) 
              && strcmp(t_password1, s[i].password))) { 
            printf("\n\nAccount Already Existed. Please "
                   "Login !\n\n"); 
            login(); 
            break; 
        } 
    } 
  
    // If no account present it creates 
    if (i == 100) { 
        strcpy(s[j].uname, t_name); 
        s[j].age = t_age; 
        strcpy(s[j].password, t_password1); 
        strcpy(s[j].email, t_email); 
        strcpy(s[j].mobile, t_mobile); 
        j++; 
        printf("\n\n\nAccount Successfully Created!\n\n"); 
    } 
} 
  
// Login function 
void login() 
{ 
    printf("\n\n\t******************"
           "Welcome to Login "
           "Page********************"
           "****\n\n"); 
    printf("\n\nLOGIN\n\n"); 
    printf("\t Enter Your Email: "); 
  
    // Askinf for email 
    scanf("%s", t_email); 
    printf("\t Enter Your Password: "); 
  
    // Asking for your Password 
    scanf("%s", t_password1); 
  
    for (i = 0; i < 100; i++) { 
        // Check whether the input email is already existed 
        // or not 
        if (!strcmp(s[i].email, t_email)) { 
            // Check whether the password is matched with 
            // the email or not 
            if (!strcmp(s[i].password, t_password1)) { 
                printf("\n\nWelcome %s, ", s[i].uname); 
                printf( 
                    "Your are successfully logged in\n\n "); 
                printf( 
                    "We Provide two ways of search : \n "); 
                printf("1) Search By Shop\n "); 
                printf("2) Search by item\n "); 
                printf("3) Exit\n\n"); 
                printf("Please Enter your choice : "); 
                scanf("%d", &search_choice); 
  
                // Getting the input whether 
                // the user are going to search 
                // /Order by Shop or search/ 
                // order by item. 
                switch (search_choice) { 
                case 1: { 
                    shop(); 
                    break; 
                } 
                case 2: { 
                    items(); 
                    break; 
                } 
                case 3: { 
                    // main function called again 
                    main(); 
                    break; 
                } 
                default: { 
                    // Choice entered is wrong 
                    printf("Please Enter the valid "
                           "choice!!!\n\n"); 
                    break; 
                } 
                } 
                break; 
            } 
            else { 
                // Password entered is wrong 
                printf("\n\nInvalid Password!!\n "); 
                printf("Please Enter the correct "
                       "password\n\n"); 
                login(); 
                break; 
            } 
        } 
        else { 
            // If details are incorrect 
            printf("\n\nAccount doesn't exist, Please "
                   "signup!!\n\n "); 
            main(); 
            break; 
        } 
    } 
} 
  
  
// Calling shop_initialize function 
void shop_initialize() 
{ 
    // All the Products avaiable are being stored 
    // in variables 
    strcpy(m[1].shop, "Puma"); 
    strcpy(m[1].item1, "puma sneaker V2"); 
    strcpy(m[1].item2, "mens dryflex"); 
    strcpy(m[1].item3, "one8x puma"); 
    m[1].first = 3499; 
    m[1].second = 2999; 
    m[1].third = 5999; 
  
    strcpy(m[2].shop, "USA"); 
    strcpy(m[2].item1, "US polo Tshirt"); 
    strcpy(m[2].item2, "Shoes"); 
    strcpy(m[2].item3, "shirt"); 
    m[2].first = 999; 
    m[2].second = 2000; 
    m[2].third = 1499; 
  
    strcpy(m[3].shop, "WROGN"); 
    strcpy(m[3].item1, "Mens Watch"); 
    strcpy(m[3].item2, "mens solid jacket"); 
    strcpy(m[3].item3, "casusal T-shirt"); 
    m[3].first = 2000; 
    m[3].second = 2239; 
    m[3].third = 799; 
} 
  
// shop Function is called 
void shop() 
{ 
    // Shop Products are collected 
    shop_initialize(); 
  
    // Showing all the availableshop 
    printf("\n\nPlease Choose the Shop \n\n1) %s\n2) "
           "%s\n3) %s", 
           m[1].shop, m[2].shop, m[3].shop); 
    printf("\n4) Exit\n\nPlease "); 
    printf("select the shop\t"); 
  
    // Asking for choice 
    scanf("%d", &shop_choice); 
    if (shop_choice > 4) { 
        printf("Please Enter the"); 
        printf("valid choice\n\n"); 
        shop(); 
    } 
    else if (shop_choice == 4) 
        main(); 
    else{ 
        // Shop function called with your choice 
        Shop(shop_choice); 
    } 
} 
  
// Function to implement the shop 
void Shop(int shop_choice) 
{ 
    // total variable 
    total = 0; 
  
    while (1) { 
  
        printf("\n\nList of items available "); 
  
        printf("in %s\n\n1) %s --> %d\n", 
               m[shop_choice].shop, m[shop_choice].item1, 
               m[shop_choice].first); 
  
        printf("2) %s --> %d\n3) %s --> %d\n", 
               m[shop_choice].item2, m[shop_choice].second, 
               m[shop_choice].item3, m[shop_choice].third); 
  
        printf("4) Cart\n5) Exit\n\nPlease Enter "); 
        printf("Your Choice : "); 
        scanf("%d", &item_choice); 
  
        // Get the input for no of items to calculate the 
        // total amount 
        if (item_choice == 1) { 
            printf("Please Enter the "); 
            printf("Count of %s\t", m[shop_choice].item1); 
            scanf("%d", &n); 
            total = total + (n * m[shop_choice].first); 
        } 
        else if (item_choice == 2) { 
            printf("Please Enter the Count"); 
            printf("of %s : ", m[shop_choice].item1); 
            scanf("%d", &n); 
            total = total + (n * m[shop_choice].second); 
        } 
        else if (item_choice == 3) { 
            printf("Please Enter the Count"); 
            printf("of %s : ", m[shop_choice].item3); 
            scanf("%d", &n); 
            total = total + (n * m[shop_choice].third); 
        } 
  
        else if (item_choice == 4) { 
            cart(); 
        } 
        else if (item_choice == 5) { 
            shop(); 
        } 
        else { 
            printf("Please Enter the"); 
            printf("valid Choice\n\n"); 
        } 
    } 
} 
  
void items() 
{ 
    total = 0; 
    // Initialize all the Shop and their items 
    shop_initialize(); 
    while (1) { 
  
        //Showing all the choices of items 
        printf("\n\nPlease choose the "); 
        printf("item\n\n1) %s /t--> %d\n2) %s/t --> %d", 
               m[1].item1, m[1].first, m[1].item2, 
               m[1].second); 
  
        printf("\n3) %s/t --> %d\n4) %s/t --> %d\n", 
               m[1].item3, m[1].third, m[2].item1, 
               m[2].first); 
  
        printf("5) %s/t --> %d\n6) %s/t --> %d\n", 
               m[2].item2, m[2].second, m[2].item3, 
               m[2].third); 
  
        printf("7) %s/t --> %d\n8) %s/t --> %d\n", 
               m[3].item1, m[3].first, m[3].item2, 
               m[3].second); 
  
        printf("9) %s/t --> %d\n10) Cart\n", m[3].item3, 
               m[3].third); 
        printf("11) Exit"); 
        printf("\nPlease Enter Your Choice : "); 
        scanf("%d", &item); 
        if (item > 10) { 
            printf("Please Enter the "); 
            printf("valid choice\n\n"); 
            items(); 
        } 
        // Moves to the cart 
        else if (item == 10) 
            cart(); 
        else if (item == 11) 
            // exit(1); 
            return; 
        // Function to get the no of items and to calculate 
        // the total amount of the order. 
        else
            item_order(item); 
    } 
} 
  
// item_order function to process items ordered 
void item_order(int item) 
{ 
  
    if (item >= 1 && item <= 3) 
        shop_id = 1; 
    else if (item >= 4 && item <= 6) 
        shop_id = 2; 
    else
        shop_id = 3; 
    if ((item % 3) == 1) { 
        // Asking for choice of product 
        printf("Please Enter the"); 
        printf(" Count of %s : ", m[shop_id].item1); 
        scanf("%d", &n); 
        total = total + (n * m[shop_id].first); 
    } 
    else if ((item % 3) == 2) { 
        // Asking for choice of product 
        printf("Please Enter the "); 
        printf("Count of %s\t", m[shop_id].item2); 
        scanf("%d", &n); 
        total = total + (n * m[shop_id].second); 
    } 
    else if ((item % 3) == 0) { 
        // Asking for choice of product 
        printf("Please Enter the Count of %s\t", 
               m[shop_id].item3); 
        scanf("%d", &n); 
        total = total + (n * m[shop_id].third); 
    } 
} 
  
// Function to implement the cart 
void cart() 
{ 
    // details about the products in cart 
    printf("\n\n\n\n\t*********************************"
           "Cart*********************************"); 
    printf("\n\nYour Total Order Amount is : %d\n", total); 
    printf("\n\nDo You wish to order (y=1/n=0) : "); 
    scanf("%d", &ch); 
    if (ch == 1) { 
        printf("\n\nThank You for your Order"); 
        printf("\nYour item is on the way. Welcome again "
               "\n\n "); 
  
        main(); 
        return; 
    } 
    else if (ch == 0) { 
        printf("To cancel Your Order = 1 \nTo Exit = 0  "); 
        printf("Select option : "); 
        scanf("%d", &confirm); 
        if (confirm == 1) { 
            //Failed 
            printf("\n\nOops! Your item is cancelled!! "
                   "Exiting..\n\n"); 
            printf("Thank You visit again!\n"); 
            main(); 
            return; 
        } 
        else { 
            // Product is bought 
            printf("\n\n\t\t************Thank "
                   "You******************\n\n"); 
            login(); 
        } 
    } 
    else { 
        // Asking for choice 
        printf("\n\nPlease Enter the correct choice\n\n "); 
        cart(); 
    } 
} 